Digital PDFs

AA-LA30A-TE

December 1988

113 pages

Original

4.1MB

Document:	VMS 5.0 System Generation Utility Manual 198804
Order Number:	AA-LA30A-TE
Revision:
Pages:	113
Original Filename:	http://bitsavers.org/pdf/dec/vax/vms/5.0/AA-LA30A-TE_VMS_5.0_System_Generation_Utility_Manual_198804.pdf

OCR Text

VMS

VMS System Generation Utility Manual

Order Number AA-LA30A-TE

VMS System Generation
Utility Manual
Order Number: AA-LA30A-TE

April 1988
This document describes the System Generation Utility for use on VAX
processors.

Revision/Update Information:

This document supersedes the
VAX/VMS System Generation Utility
Reference Manual, Version 4.0.

Software Version:

VMS Version 5.0

digital equipment corporation
maynard, massachusetts

April 1988
The information in this document is subject to change without notice and should
not be construed as a commitment by Digital Equipment Corporation. Digital
Equipment Corporation assumes no responsibility for any errors that may appear
in this document.
The software described in this document is furnished under a license and may be
used or copied only in accordance with the terms of such license.
No responsibility is assumed for the use or reliability of software on equipment
that is not supplied by Digital Equipment Corporation or its affiliated companies.
Copyright © 1988 by Digital Equipment Corporation
All Rights Reserved.
Printed in U.S.A.
The postpaid READER'S COMMENTS form on the last page of this document
the user's critical evaluation to assist in preparing future documentation.
The following are trademarks of Digital Equipment Corporation:
DEC
DEC/CMS
DEC/MMS
DECnet
DECsystem-10
DECSYSTEM-20
DECUS
DECwriter

DIBOL
EduSystem
IAS
MASSBUS
PDP
PDT
RSTS
RSX

UNIBUS
VAX
VAXcluster
VMS
VT

~urnuo~u TM
ZK4560

HOW TO ORDER ADDITIONAL DOCUMENTATION
DIRECT MAIL ORDERS
USA & PUERTO RICO*

CANADA

INTERNATIONAL

Digital Equipment Corporation
P.O. Box CS2008
Nashua, New Hampshire
03061

Digital Equipment
of Canada Ltd.
100 Herzberg Road
Kanata, Ontario K2K 2A6
Attn: Direct Order Desk

Digital Equipment Corporation
PSG Business Manager
c/o Digital's local subsidiary
or approved distributor

In Continental USA and Puerto Rico call 800-258-1710.
In New Hampshire, Alaska, and Hawaii call 603-884-6660.
In Canada call 800-267-6215.
*Any prepaid order from Puerto Rico must be placed with the local Digital subsidiary (809-754-7575).
Internal orders should be placed through the Software Distribution Center (SDC), Digital Equipment
Corporation, Westminster, Massachusetts 01473.

Production Note
This book was produced with the VAX DOCUMENT electronic publishing
system, a software tool developed and sold by DIGITAL. In this system,
writers use an ASCII text editor to create source files containing text and
English-like code; this code labels the structural elements of the document,
such as chapters, paragraphs, and tables. The VAX DOCUMENT software,
which runs on the VMS operating system, interprets the code to format the
text, generate a table of contents and index, and paginate the entire document.
Writers can print the document on the terminal or line printer, or they can use
DIGITAL-supported devices, such as the LN03 laser printer and PostScript®J
printers (PrintServer 40 or LN03R ScriptPrinter), to produce a typeset-quality
copy containing integrated graphics.

®>

PostScript is a trademark of Adobe Systems, Inc.

Contents
PREFACE

vii

NEW AND CHANGED FEATURES

SYSGEN Description
1

SGN-1

SPECIFYING VALUES FOR SYSGEN QUALIFIERS AND
PARAMETERS

SGN-1

ACTIVE AND CURRENT PARAMETER VALUES

SGN-1

SYSGEN Usage Summary

SGN-3

SYSGEN Commands

SGN-4
AUTOCONFIGURE
CONFIGURE
CONNECT/ADAPTER=ADAPTER-SPEC
CONNECT/NOADAPTER
CONNECT CONSOLE
CREATE
DISABLE CHECKS
ENABLE CHECKS
EXIT
HELP
INSTALL
LOAD
MSCP
RELOAD
SET/OUTPUT
SET PARAMETER-NAME
SET/STARTUP
SHARE
SHARE/INITIALIZE
SHOW/ADAPTER
SHOW/CON FIGURATION
SHOW/DEVICE=DEVICE-DRIVER
SHOW/DRIVER=DEVICE-DRIVER
SHOW [PARAMETER]
SHOW/STARTUP

SGN-5
SGN-8
SGN-10
SGN-12
SGN-13
SGN-14
SGN-16
SGN-17
SGN-18
SGN-19
SGN-21
SGN-22
SGN-23
SGN-24
SGN-25
SGN-26
SGN-27
SGN-28
SGN-29
SGN-31
SGN-32
SGN-34
SGN-35
SGN-36
SGN-39

Contents

SHOW/UNIBUS
TERMINAL/ECHO
USE
WRITE

SGN-40
SGN-42
SGN-43
SGN-44

APPENDIX A SUPPLEMENTAL SYSGEN INFORMATION

A-1

A.1

PARAMETER CATEGORIES

A-1

A.2

PARAMETER DESCRIPTIONS

A-5

APPENDIX B UNIBUS/Q22 BUS DEVICE SUPPORT
B.1

SYSGEN DEVICE TABLE

APPENDIX C VAXSTATION 2000/MICROVAX 2000 DEVICE
SUPPORT
C.1

CONFIGURING VAXSTATION 2000/MICROVAX 2000
DEVICES

B-1
B-1

C-1

INDEX

TABLES

SGN-6

SGN-1

Device Type Codes

B-1

SYSGEN Device Table

B-2

C-1

VAXstation 2000 Autoconfiguration Table

C-2

Preface
Intended Audience
This manual is intended for VMS system managers, operators, and system
programmers.

Document Structure
This document consists of the following six sections:
•

Description-Provides an overview and detailed usage information for
the System Generation Utility (SYSGEN).

•

Usage Summary-Outlines the following SYSGEN information:
-Invoking the utility
-Exiting from the utility
-Directing output
-Restrictions or privileges required

•

Commands-Describes SYSGEN commands including format,
parameters, and examples.

•

Appendix A-Provides complete descriptions of SYSGEN parameters.

•

Appendix B-Lists the characteristics of all DIGITAL UNIBUS and Q22
bus devices.

•

Appendix C-Lists the characteristics of all DIGITAL VAXstation 2000/
Micro VAX 2000 devices.

Associated Documents
For additional information about the topics covered in this document, refer to
the following documents:

•

VMS DCL Dictionary

•

Guide to Setting Up a VMS System

•

Guide to VMS Performance Management

•

VMS Device Support Manual

vii

Preface

Conventions
Convention

Meaning
In examples, a key name (usually abbreviated)
shown within a box indicates that you press
a key on the keyboard; in text, a key name is
not enclosed in a box. In this example, the key
is the RETURN key. (Note that the RETURN
key is not usually shown in syntax statements
or in all examples; however, assume that you
must press the RETURN key after entering a
command or responding to a prompt.)

viii

CTRL/C

A key combination, shown in uppercase with a
slash separating two key names, indicates that
you hold down the first key while you press the
second key. For example, the key combination
CTRL/C indicates that you hold down the key
labeled CTRL while you press the key labeled C.
In examples, a key combination is enclosed in a
box.

$SHOW TIME
05-JUN-1988 11 :55:22

In examples, system output (what the system
displays) is shown in black. User input (what
you enter) is shown in red.

$ TYPE MYFILE.DAT

In examples, a vertical series of periods, or
ellipsis, means either that not all the data that
the system would display in response to a
command is shown or that not all the data a
user would enter is shown.

input-file, ...

In examples, a horizontal ellipsis indicates
that additional parameters, values, or other
information can be entered, that preceding
items can be repeated one or more times, or
that optional arguments in a statement have
been omitted.

[logical-name]

Brackets indicate that the enclosed item is
optional. (Brackets are not, however, optional
in the syntax of a directory name in a file
specification or in the syntax of a substring
specification in an assignment statement.)

quotation marks
apostrophes

The term quotation marks is used to refer
to double quotation marks (" ). The term
apostrophe ( · ) is used to refer to a single
quotation mark.

New and Changed Features
A new class of system parameters, MULTIPROCESSING, has been added
to the System Generation Utility (SYSGEN) for VMS Version 5.0. The
MULTIPROCESSING class of parameters contains system parameters
associated with symmetric multiprocessing (SMP). In addition, new
parameters have been added to the CLUSTER and SYS classes of SYSGEN
parameters. These new parameters are listed in the following table:
Class

Parameter Name

CLUSTER

EXPECTED_VOTES
MSCP_BUFFER
MSCP_CREDITS
MSCP_LOAD
MSCP_SERVE_ALL
NISCS_CONV_BOOT
NISCS_LOAD_PEAO
NISCS_PORT_SERV

MULTIPROCESSING

MULTIPROCESSING
SMP_CPUS
SMP_LNGSPINWAIT
SMP_SANITY_CNT
SMP_SPINW AIT

SYS

DUMPSTYLE
ERRORLOGBUFFERS
MPW_IOLIMIT
MPW_LOW AITLIMIT
SHADOWING
T APE_MVTIMEOUT
WINDOW _SYSTEM

See Appendix A for descriptions of these new SYSGEN parameters.
The following system parameters have been removed from the SYSGEN
manual for VMS Version 5.0:
•

QUORUM

•

TAILORED

SYSGEN Description
The System Generation Utility (SYSGEN) is a system management tool used
to tailor a system for a specific hardware and software configuration. Use
SYSGEN commands to manipulate specific parts of the operating system, as
follows:
•

System parameters-DISABLE, ENABLE, SET, SHOW, USE, and WRITE

•

Devices and device drivers-AUTOCONFIGURE, CONFIGURE,
CONNECT, LOAD, RELOAD, SHOW /CONFIGURATION,
SHOW /DEVICE, SHOW /DRIVER, and SHOW /UNIBUS. The SYSGEN
device table (Table B-1) lists the characteristics of all DIGITAL devices
that SYSGEN configures automatically. For a complete description of
devices and device drivers, refer to the VMS Device Support Manual.

•

System files-CREATE and INSTALL

•

Startup command procedure-SET /STARTUP and SHOW /STARTUP

•

Multiport memory-SHARE and SHARE/INITIALIZE

You can use a subset of the SYSGEN commands when you invoke the
SYSBOOT facility during bootstrap operations; see the installation instructions
for your VAX processor and the Guide to Setting Up a VMS System for more
information.

Specifying Values for SYSGEN Qualifiers and Parameters
Normally, you specify values as an integer, keyword, or file specification.
For parameters, integer values must be within the defined maximum and
minimum values for the parameter unless the SYSGEN command DISABLE
CHECKS was specified.
You can specify values for certain SYSGEN qualifiers and parameters in
hexadecimal or octal radixes and for others as an ASCII string. To specify a
value in octal or hexadecimal, precede the value with %0 or %X, respectively.
To specify a value in ASCII, enclose the value string in quotation marks (" ").

Active and Current Parameter Values
It is important to understand the terms active and current when they are
used to refer to system parameters. The term active parameters refers
to the parameter values that are active when the system is running.
The only active parameters that can be changed on a running system
are those that are categorized as dynamic parameters (see Section A.1).
The term current parameters refers to those values stored on disk
(SYS$SYSTEM:VAXVMSSYS.PAR) that are used to boot the system. The
current parameters become the active parameters when the system boots.

Modifying active parameters with SYSGEN has no effect on the values of the
stored current parameters; you change the values of these parameters only
while the system is running. The next time you bootstrap the system, the
old values of the current parameters are established as the active parameters.
When you want to change the values of the current parameters on disk, you
must use the SYSGEN command WRITE CURRENT. When you want to
SGN-1

SYSGEN Description

change the value of any active parameter that is not in the dynamic category,
you must enter the WRITE CURRENT command and reboot the system.

SGN-2

SYSGEN Usage Summary
The System Generation Utility (SYSGEN) is a system management tool
that performs certain privileged system configuration functions. With
SYSGEN, you can create and modify system parameters, load device
drivers, and create additional page and swap files.

FORMAT

RUN SYS$SYSTEM:SYSGEN

PARAMETERS

None.

usage summary

To invoke SYSGEN, type RUN SYS$SYSTEM:SYSGEN at the DCL command
prompt. At the SYSGEN> prompt, enter any of the SYSGEN commands
described in the following section. These commands follow the standard rules
of grammar as specified in the VMS DCL Dictionary.
To exit from SYSGEN, enter the SYSGEN command EXIT at the SYSGEN>
prompt or press CTRL/Z. You can direct output from a SYSGEN session
to an output file using the SET/OUTPUT command. By default, output is
written to SYS$0UTPUT.

Note: DIGITAL recommends the use of the AUTOGEN command procedure
when modifying system parameters, loading device drivers, or creating
additional page and swap files. Refer to the Guide to Setting Up a VMS
System for a description of AUTOGEN.

SGN-3

SYSGEN
SVSGEN Commands

SYSGEN
COMMANDS

This section explains SYSGEN commands and provides examples of their use.
The following SYSGEN commands are described:
AUTOCONFIGURE
CONFIGURE
CONNECT/ ADAPTER
CONNECT /NO ADAPTER
CONNECT CONSOLE
CREATE
DISABLE CHECKS
ENABLE CHECKS
EXIT
HELP
INSTALL
LOAD
MSCP
RELOAD
SET/OUTPUT
SET
SET /STARTUP
SHARE
SHARE/INITIALIZE
SHOW/ADAPTER
SHOW/CONFIGURATION
SHOW /DEVICE
SHOW/DRIVER
SHOW
SHOW /STARTUP
SHOW/UNIBUS
TERMINAL/ECHO
USE
WRITE

SGN-4

SYSGEN
AUTOCONFIGURE

AUTOCONFIGURE
Automatically connects devices that are physically attached to the system
and loads their drivers.
Use of the AUTOCONFIGURE command requires the CMKRNL privilege.

FORMAT

PARAMETER

AUTOCONFIGURE adapter-spec
AUTOCONFIGURE ALL
adapter-spec
Specifies the adapter specification (backplane interconnect arbitration line)
or slot number of the single UNIBUS or MASSBUS adapter that is to be
configured. The adapter specification can be expressed as an integer or with
one of the names listed by the SYSGEN command SHOW/ ADAPTER.
You can specify AUTOCONFIGURE ALL to configure all standard devices
attached to the system.

QUALIFIERS

/EXCLUDE=(device-name[, ... ])
Specifies the device types that you do not want automatically configured.
You can specify a device-type code as shown in Table SGN-1 or a standard
device name as shown in Table B-1. You can include a controller designation
but not a unit number. If the controller designation is omitted, all devices of
the specified type are excluded. The device-name specification defaults to all
devices on the adapter.
Do not use this qualifier with the /SELECT qualifier.

/LOG
Produces a display of the controller and its units on the current
SYS$0UTPUT device after they have been successfully autoconfigured. Each
controller and its associated units are displayed only after AUTOCONFIGURE
has found the next controller. Therefore, the error message displays precede
the display of the controller and units that caused the error.

/SELECT=(device-name[, .. .])
Specifies the device types that you want automatically configured.
You can specify a device-type code as shown in Table SGN-1 or a standard
device name as shown in Table B-1. You can include a controller designation
but not a unit number. If the controller designation is omitted, all devices of
the specified type are selected. The device-name specification defaults to all
devices on the adapter.
Do not use /SELECT with the /EXCLUDE qualifier.

SGN-5

SYSGEN
AUTOCONFIGURE

Table SGN-1

SGN-6

Device Type Codes

Code

Device Type

Card Reader

Console Storage Device

RP05, RP06 Disk

TU58 Cartridge Tape

RA 60 Disk

RL02 Cartridge Disk

RK06, RK07 Cartridge Disk

RL02 Cartridge Disk, R80 Disk

RM03, RM05, RM80, RP07 Disk

UDA Disk

RXO 1 Floppy Diskette

RX02 Floppy Diskette

LP A 11-K Laboratory Peripheral Accelerator

Line Printer on DMF32

Line Printer on LP 11

Mailbox

TU78 Magnetic Tape

TS11 Magnetic Tape

TE16, TU45, TU77 Magnetic Tape

Tape Class Driver

NET

Network Communications Logical Device

System "Null" Device

Operator's Console

Computer Interconnect (Cl)

TU81 Magnetic Tape

UDA-50

Remote Terminal

Interactive Terminal on DZ 11

Interactive Terminal on DMF32, DMZ32, DHU 11, or DMB32

DR 11-W General Purpose OMA Interface

DMP-11 Synchronous Communications Line

DR32 Interface Adapter

DMF32 Synchronous Communications Line

DR Interface on DMF-32

DUP 11 Synchronous Communications Line

DMC 11 Synchronous Communications Line

SYSGEN
AUTOCONFIGURE

EXAMPLES

SYSGEN> AUTOCONFIGURE ALL

The command in this example automatically configures all standard devices.
~

SYSGEN> AUTOCONFIGURE ALL/SELECT=(TT,MTA,LP)

The command in this example automatically configures all terminals, all
magnetic tape units on controller A, and all line printers.
~

SYSGEN> AUTOCONFIGURE ALL/EXCLUDE=XM

The command in this example illustrates the use of the /EXCLUDE qualifier
to autoconfigure all but the DMCll devices, assuming DECnet-VAX will not
be operating on this system.

SGN-7

SYSGEN
CONFIGURE

CONFIGURE
Requests UNIBUS device names and issues the set of CSR and vector
addresses that AUTOCONFIGURE will use.

FORMAT

CONFIGURE

PARAMETERS

None.

QUALIFIERS

/INPUT=file-spec
Specifies the name of an input file from which previously prepared data is
read. By default, input data is read from SYS$INPUT.

/OUTPUT=fi/e-spec
Specifies the name of an output file to which output from CONFIGURE is
written. By default, output is directed to SYS$0UTPUT. The default file type
is LIS.

/[NO]RESET
Controls whether controller names are reset. The /NORESET qualifier is
useful with multiple UNIBUS systems. When you specify /NORESET,
it is not necessary to specify the second parameter (p) on subsequent
CONFIGURE commands, since the controller names are not reset. By default,
if you omit /NORESET, the controller names are reset.

DESCRIPTION

CONFIGURE issues the following prompt:
DEVICE>

Input should be in the following form, where device is the name of the
controller:
device[[,n],p]

Possible controller names are listed in the second column in Table B-1. You
cannot abbreviate controller names.
You can optionally specify n, the number of devices on the UNIBUS being
configured, and p, the optional number of devices on all previous UNIBUS
devices in a multiple UNIBUS system. Note that p affects only the device
names, not the addresses generated. By default, n is 1 and p is 0.
SYSGEN continues to prompt for devices until you respond with CTRL/Z. It
then displays the control and status register (CSR) and vector addresses for
the devices specified.

SGN-8

SYSGEN
CONFIGURE

EXAMPLE
SYSGEN> CONFIGURE
DEVICE> DZ11,3,2
DEVICE> LP11
DEVICE> DMC11,2
DEVICE> icTRL/ZI

The system displays the following data:
Device:
Device:
Device:
Device:
Device:
Device:
Device:

RK611
LP11
DMC11
DMC11
DZ11
DZ11
DZ11

Name:
Name:
Name:
Name:
Name:
Name:
Name:

DMA
LPA
XMA
XMB
TTC
TTD
TTE

CSR: 777440 Vector: 210 Support:
CSR: 777514 Vector: 200 Support:
CSR: 760070* Vector: 300* Support:
CSR: 760100* Vector: 310* Support:
CSR: 760120* Vector: 320* Support:
CSR: 760130* Vector: 330* Support:
CSR: 760140* Vector: 340* Support:

yes
yes
yes
yes
yes
yes
yes

* Indicates a floating address. See
Appendix B for a description of floating addresses.

This example illustrates the use of the CONFIGURE command to calculate
the UNIBUS CSR and vector addresses. The support field in the display
indicates whether DIGITAL provides a supported driver for this device with
the VMS operating system.

SGN-9

SYSGEN
CONNECT/ADAPTER=adapter-spec

CONNECT/ADAPTER=adapter-spec
Connects a hardware device and loads its driver if the driver is not already
loaded. The adapter specification is the name of the UNIBUS or MASSBUS
adapter to which the device is attached. The value can be expressed as
an integer or as one of the names listed by the SYSGEN command
SHOW/ ADAPTER.
Use of the CONNECT/ ADAPTER=adapter-spec command requires the
CMKRNL privilege.

FORMAT
PARAMETER

CONNECT/ADAPTER=adapter-spec

device

device
Specifies the name of the hardware device to be connected. It should be
specified in the following form: device-type, controller, unit. For example,
LPAO specifies the line printer (LP) on controller A at unit number 0. When
specifying the device name, do not follow it with a colon (: ).

QUALIFIERS

/ADPUNIT=unit-number
Unit number of a device on the MASSBUS adapter. The unit number for a
disk drive is the number of the plug on the drive. For magnetic tape drives,
the unit number corresponds to the tape controller's number.

/CSR=csr-addr
Specifies the UNIBUS address of the first addressable location on the
controller (usually the status register) for the device. This qualifier must
be specified for UNIBUS devices. For devices on multiple device boards (for
example, the DMF32), the address must be the CSR address specified in the
output of the CONFIGURE command. To specify the address in octal or
hexadecimal, precede the address with %0 or %X, respectively.

/CSR_OFFSET=value
For devices on multiple device boards, specifies the offset from the CSR
address of the multiple device board to the CSR address for the specific
device being connected. To specify the address in octal or hexadecimal,
precede the address with %0 or %X, respectively.

/DRIVERNAME=driver
Specifies the name of the driver as recorded in the prolog table. If the driver
has not been loaded, the system acts as if the driver name is also the name
of an executable image (file type of EXE) in the SYS$LOADABLE_JMAGES
directory and loads the driver. The driver name defaults to the first two
characters of the device name concatenated with "DRIVER" (for example,
LPDRIVER).

SGN-10

SYSGEN
CONNECT/ADAPTER=adapter-spec

/MAXUN/TS=max-unit-cnt
Specifies the maximum number of units the controller can support (that is,
the number of UCB slots in the IDB). The default is the number specified in
the prolog table of the driver, or 8 if the number is not specified in the prolog
table.

/NUMVEC=vector-cnt
Specifies the number of interrupt vectors for the device. By default, the vector
count is 1.

/SYSIDHIGH=va/ue
Specifies the high-order 16 bits of the 48-bit system identification number and
must be 0. To specify the value in octal or hexadecimal, precede the value
with %0 or %X, respectively.

/SYSIDLOW=value
Specifies the low-order 32 bits of the 48-bit system identification number.
The value must be identical to the DECnet-VAX node number. To specify the
value in octal or hexadecimal, precede the value with %0 or %X, respectively.

/VECTOR=vector-addr
Specifies the UNIBUS address of the interrupt vector for the device or the
lowest vector, if there is more than one. This qualifier must be specified for
UNIBUS devices. For devices on multiple device boards (for example, the
DMF32), the address must be the interrupt vector address for the multiple
device board specified in the output of the CONFIGURE command. To
specify the address in octal or hexadecimal, precede the address with %0 or
%X, respectively.

/VECTOR_OFFSET=value
For devices on multiple device boards, specifies the offset from the interrupt
vector address of the multiple device board to the interrupt vector address
for the specific device being connected. To specify the address in octal or
hexadecimal, precede the address with %0 or %X, respectively.

DESCRIPTION

Use this command to connect devices that are not physically attached to the
system or whose drivers are not standard.

Caution: Exercise extreme caution when using the CONNECT/ ADAPTER=adapterspec command because the system does little error checking. An incorrect
vector address or misspelled device name, for example, will damage the
1/0 database and usually causes the system to fail. The VMS Device
Support Manual contains more detailed information on loading device
drivers and connecting devices.
·

EXAMPLE
SYSGEN> CONNECT LPAO/ADAPTER=3/CSR=%0777514 SYSGEN> /DRIVERNAME=LP2DRIVER/VECTOR=%0200

The command in this example connects the device named LP AO to the driver
named LP2DRIVER and loads the driver if it is not already loaded.

SGN-11

SYSGEN
CONNECT/NOADAPTER

CONNECT/NOADAPTER
Connects a software device and loads its driver if it is not already loaded.
Use of the CONNECT /NOADAPTER command requires the CMKRNL
privilege.

FORMAT
PARAMETER

CONNECT/NOADAPTER

device

device
Specifies the name of the software device to be connected.

QUALIFIER

/DRIVERNAME=driver
Specifies the name of the driver as recorded in the prolog table. If the driver
has not been loaded, the system acts as if the driver name is also the name
of an executable image (file type of EXE) in the SYS$LOADABLE_IMAGES
directory and loads the driver. The default is the first two characters of the
device name concatenated with "DRIVER" (for example, LPDRIVER). The
driver prolog table must specify ADAPTER=NULL for this command to work.

EXAMPLE
SYSGEN> CONNECT NET/NOADAPTER/DRIVER=NETDRIVER

The command in this example connects the device NET to the driver
NETDRIVER and loads the driver if it is not already loaded.

SGN-12

SYSGEN
CONNECT CONSOLE

CONNECT CONSOLE
The CONNECT CONSOLE command connects the console block storage
devices and loads the driver. The console block storage device driver is
CSDRIVER.EXE.
Use of the CONNECT CONSOLE command requires the CMKRNL privilege.

FORMAT

CONNECT CONSOLE

PARAMETERS

None.

QUALIFIERS

/N/
Enables a port for a console connected through the NI.

/REMOTE
Enables a remote diagnostic port for a second console or terminal connected
to a VAX 8600 or VAX 8650 system.

/USER
Enables a port for a system user terminal connected to a VAX 8800 system.

SGN-13

SYSGEN
CREATE

CREATE
Creates or extends a file that can be used as a page, swap, or dump file.

FORMAT
PARAMETER

CREATE

file-spec

file-spec
Specifies the name of the page, swap, or dump file. The default
file type is SYS. Primary page and swap files have the names
SYS$SYSTEM:PAGEFILE.SYS and SYS$SYSTEM:SWAPFILE.SYS.
The dump file name is SYS$SYSTEM:SYSDUMP.DMP. When you create a
new SYSDUMP.DMP file, you must explicitly specify the file type DMP.

QUALIFIERS

/[NO]CONTIGUOUS
Controls whether CREATE creates a contiguous file. The default is
/NOCONTIGUOUS, which implies a contiguous-best-try file. If
/NOCONTIGUOUS is specified, the following logic is used:
1

If the file does not exist, SYSGEN creates it.

If the file does exist, and the size specified by the /SIZE qualifier is
smaller than the current size, SYSGEN creates a new file of the new size.

If the file does exist, and the size specified by the /SIZE qualifier is larger
than the current size, SYSGEN extends the current file to the new size.

The /CONTIGUOUS qualifier forces the creation of a new file and guarantees
that the file will be contiguous.

/SIZE=block-count
Specifies the number of blocks to be allocated to the file when the operation
is complete.

DESCRIPTION

You do not have to enter this command directly for the creation of primary
files because the installation of VMS creates them. However, you should
execute the command procedure SYS$UPDATE:SWAPFILES to change the
size of the primary files.
A secondary page or swap file only takes effect after you install it with
the SYSGEN commmand INSTALL. The only way to make a new
SYSDUMP.DMP file active is by rebooting the system.
Files created with SYSGEN receive the default protection of the process that
invoked SYSGEN. DIGITAL recommends that you use the SWAPFILES
command procedure, which includes a SET PROTECTION command,
to establish appropriate protection for the files after it creates them with
SYSGEN.

SGN-14

SYSGEN
CREATE

EXAMPLES
iJ

SYSGEN> CREATE SYS$SYSTEM:PAGEFILE/SIZE=95000/CONTIGUOUS
%SYSGEN-I-CREATED, SYS$SYSROOT: [SYSEXE]PAGEFILE.SYS;2 created

The command in this example creates a contiguous page file of 95,000 blocks.
~

SYSGEN> CREATE SYS$SYSTEM:PAGEFILE/SIZE=100000
%SYSGEN-I-EXTENDED, SYS$SYSROOT: [SYSEXE]PAGEFILE.SYS;2 extended

The command in this example extends the file created in Example 1 to
100 ,000 blocks.

SGN-15

SYSGEN
DISABLE CHECKS

DISABLE CHECKS
Inhibits range checks on parameter values specified in SET commands.

FORMAT

DISABLE CHECKS

PARAMETERS

None.

QUALIFIERS

None.

DESCRIPTION

Initially, checks are enabled. If you specify a value above the maximum, the
system sets the parameter to the maximum and issues an error message. If
you specify a value below the minimum, the system sets the parameter to the
minimum and issues an error message. The DISABLE CHECKS command
allows you to override maximum and minimum values.

Caution: The minimum and maximum values established by DIGIT AL are
intended as strict guidelines. Setting parameter values outside these
limits can result in system failures or hangs. The use of DISABLE
CHECKS is not recommended.

EXAMPLE
SYSGEN> SET WSMAX 20
%SYSGEN-W-SETMIN, Value set to minimum for parameter WSMAX
SYSGEN> DISABLE CHECKS
SYSGEN> SET WSMAX 20

In this example, the initial attempt to set WSMAX below the minimum fails
because range checks are enabled. However, once the user disables range
checks, the SET WSMAX command succeeds.

SGN-16

SYSGEN
ENABLE CHECKS

ENABLE CHECKS
Ensures that range checks are in effect.
Initially, range checks are enabled. Use ENABLE CHECKS only after you
enter a DISABLE CHECKS command.

FORMAT

ENABLE CHECKS

PARAMETERS

None.

QUALIFIERS

None.

EXAMPLE
SYSGEN> DISABLE CHECKS
SYSGEN> SET WSMAX 20
SYSGEN> ENABLE CHECKS
SYSGEN> SET WSMAX 30
%SYSGEN-W-SETMIN, Value set to minimum for parameter WSMAX

This example illustrates the use of the ENABLE CHECKS command to
reenable parameter value checks.

SGN-17

SYSGEN
EXIT

EXIT
Returns you to command level. You can also return to command level by
pressing CTRL/Z.

FORMAT

EXIT

PARAMETERS

None.

QUALIFIERS

None.

SGN-18

SYSGEN
HELP

HELP
Lists and explains the SYSGEN commands.

FORMAT
PARAMETER

HELP {command-name]
command-name
Specifies the name of a SYSGEN command or the keyword PARAMETERS.
The command HELP PARAMETERS displays a list of all parameters and
prompts for a parameter name.

QUALIFIERS

None.

DESCRIPTION

If you do not specify either a command name or the keyword PARAMETERS,

HELP displays general information on the commands for which help is
available. It then prompts with "Topic?". You can supply a command
name, the keyword PARAMETERS, or press RETURN. When you specify
a command name and qualifiers, you get detailed information about that
command. If you respond by pressing RETURN, you exit from the HELP
command. You can also exit from the HELP command by pressing CTRL/Z.
Do not respond with CTRL/Y unless you want to exit from both HELP and
SYSGEN.
If the command for which you request help accepts qualifiers, the display

of information for the command is followed by a prompt that includes the
command name and the prompt "Subtopic?". Respond to this prompt with a
qualifier name or by pressing RETURN. If you respond by pressing RETURN,
you move to the first level of HELP and HELP prompts with "Topic?". If you
want to exit the HELP command directly from any level, press CTRL/Z.

EXAMPLE
SYSGEN>

HELP AUTOCONFIGURE

AUTOCONFIGURE
Automatically configures the device driver database. It locates each
device unit physically attached to the system, loads the appropriate
driver, creates the appropriate data structures, and connects the driver
to the device's interrupt.
Format
AUTOCONFIGURE ALL
AUTOCONFIGURE adapter-spec
CMKRNL privilege required

SGN-19

SYSGEN
HELP

Additional information available:
adapter-spec
/SELECT
/EXCLUDE

ALL
/LOG

qualifiers

. AUTOCONFIGURE Suptopic?

The HELP command in this example displays information about the
AUTOCONFIGURE command.

SGN-20

SYSGEN
INSTALL

INSTALL
Activates a secondary page or swap file. The new page or swap file is
effective until system shutdown.
Use of the INSTALL command requires the CMKRNL privilege.

FORMAT
PARAMETER

INSTALL

file-spec

file-spec
Specifies the name of the secondary page or swap file created with the
SYSGEN command CREATE. The default file type is SYS.

QUALIFIERS

/PAGEFILE
Specifies that the file is to be installed as an additional page file. All processes
created after the page file is installed use the page file with the most available
free space; processes created before the additional page file is installed
continue to use the page file to which they are assigned.

/SWAPFILE
Specifies that the file is to be installed as an additional swap file. This swap
file augments the swap file installed during the bootstrap process.

EXAMPLE
SYSGEN> INSTALL SYS$SYSTEM:PAGEFILE.SYS/PAGEFILE

The command in this example installs a secondary page file.

SGN-21

SYSGEN
LOAD

LOAD
Loads an 1/0 driver.
Use of the LOAD command requires the CMKRNL privilege.

FORMAT
PARAMETER

LOAD

file-spec

file-spec
Specifies the file specification of the driver image to be loaded. The default
file type is EXE.
If the entire file specification is the same as that of a driver already loaded,
no load takes place. If only the file name is the same as that of a driver that
is already loaded (but the file specification is different}, the specified driver
replaces the existing driver.

QUALIFIERS

None.

DESCRIPTION

Refer to the VMS Device Support Manual for a complete description of the
LOAD command.

EXAMPLE
SYSGEN>

LOAD SYS$SYSTEM:RTTDRIVER

The command in this example loads the standard driver for a remote terminal.

SGN-22

SYSGEN
MSCP

MSCP
Loads and starts the MSCP server.
This method of loading the MSCP server has been superseded for VMS
Version 5.0 by the SYSGEN parameter MSCP_LQAD. To load the MSCP
server, set the MSCP_LOAD parameter to 1. Define the disks to be served
with the MSCP_SERVE_ALL parameter. See Appendix A for descriptions
of the MSCP parameters.

FORMAT

MSCP

SGN-23

SYSGEN
RELOAD

RELOAD
Replaces a loaded device driver with a new version.
Use of the RELOAD command requires the CMKRNL privilege.

FORMAT
PARAMETER

RELOAD

file-spec

file-spec
The file specification of the new driver image. The default file type is EXE.
The specified image is loaded and replaces any existing driver with the same
file specification.

QUALIFIERS

None.

DESCRIPTION

Refer to the VMS Device Support Manual for a complete description of the
RELOAD command.

EXAMPLE
SYSGEN>

RELOAD SYS$SYSTEM:RTTDRIVER

The command in this example reloads the remote terminal driver.

SGN-24

SYSGEN
SET/OUTPUT

SET/OUTPUT
Establishes a file to be used for output during the session. By default the
output is written to SYS$0UTPUT, but you can use the SET /OUTPUT
command to designate a disk file.
At any time you can direct the output back to SYS$0UTPUT by using the
SET /OUTPUT=SYS$0UTPUT command.

FORMAT
PARAMETER

SET/OUTPUT[=]

file-spec

file-spec
The name of the output file. The default file type is LIS. The equal
sign ( =) is optional.

EXAMPLE
SYSGEN>
SYSGEN>
SYSGEN>
SYSGEN>

SET/OUTPUT=PARAMS.LIS
SHOW/ALL
SHOW/SPECIAL
EXIT

In this example, output is directed to the file P ARAMS.LIS to capture a
complete list of all the system parameters (including the SPECIAL parameters
reserved for DIGITAL use) and their values.

SGN-25

SYSGEN
SET parameter-name

SET parameter-name
Assigns a value to a system parameter in the SYSGEN work area.
This command does not modify parameter files, the current system
parameter file on disk, or the active system; for information on performing
these modifications, see the WRITE command.

SET parameter-name

FORMAT
PARAMETERS

value

parameter-name
Specifies the name of a system parameter. If you enter a period (. ), it is
interpreted as a request for the system parameter specified in the last SET or
SHOW command. See the description of the SHOW [parameter] command
for an example of the use of the period in place of a parameter name.
You can display the system parameters and request information on them with
the SYSGEN command HELP PARAMETERS.

value
Usually specifies an integer or the keyword DEFAULT. Integer values must be
within the defined minimum and maximum values for the parameter unless
the SYSGEN command DISABLE CHECKS was specified.
The keyword DEFAULT specifies the default value for the parameter. You
can display the maximum, minimum, and default values for any parameter
with the SYSGEN command SHOW [parameter].
You can specify values for certain SYSGEN parameters in hexadecimal or
octal radixes and for others as an ASCII string. To specify a value in octal or
hexadecimal, precede the value with %0 or %X, respectively. To specify a
value in ASCII, enclose the value string in quotation marks (" ").

QUALIFIERS

None.

EXAMPLES
i]

SYSGEN>

SET PFCDEFAULT 20

The command in this example assigns a value of 20 to the PFCDEFAULT
parameter.

SYSGEN>

SET GBLSECTIONS DEFAULT

The command in this example assigns the default value (40) to the
GBLSECTIONS parameter.

SGN~26

SYSGEN
SET/STARTUP

SET/STARTUP
Names the site-independent startup command procedure to be associated
with a parameter file for subsequent bootstrap operations.

FORMAT
PARAMETER

SET/STARTUP

file-spec

file-spec
The file specification of a startup command procedure on the system
disk (maximum of 31 characters). The initial site-independent startup
command procedure (as named in the software distribution kit) is
SYS$SYSTEM:STARTUP.COM.

EXAMPLE
SYSGEN>

SET/STARTUP SYS$SYSTEM:XSTARTUP.COM

The command in this example assigns SYS$SYSTEM:XSTARTUP.COM as the
current site-independent startup command procedure.

SGN-27

SYSGEN
SHARE

SHARE
Connects a processor to a multiport memory unit already initialized by this
or another processor. The number and name of the specified multiport
memory unit must be those of an initialized unit, or an error condition
results.
Use of the SHARE command requires the CMKRNL privilege.

FORMAT
PARAMETERS

MPMn MPM-name

MPMn
Specifies the number on the front panel of the multiport memory unit being
connected.

MPM-name
The name of the multiport memory unit as specified in a previous
SHARE/INITIALIZE command.

EXAMPLE
SYSGEN>

SHARE MPM1 SHR_MEM_1

The command in this example connects a multiport memory unit. Since no
qualifiers are specified, defaults apply to all the parameters.
The unit with a 1 on the front panel must be initialized with the name
SHR_MEM_l for the command to work.

SGN-28

SYSGEN
SHARE/INITIALIZE

SHARE/INITIALIZE
Initializes a multiport memory unit and connects it to the processor on
which SYSGEN is running.
Use of the SHARE/INITIALIZE command requires the CMKRNL privilege.

FORMAT
PARAMETERS

SHARE/INITIALIZE

MPMn MPM-name

MPMn
Specifies the number on the front panel of the multiport memory unit being
connected.

MPM-name
Specifies the name by which the multiport memory unit is to be known to
systems using it. The MPM-name is a 1 through 15 alphanumeric character
string that may contain dollar signs ( $) and underscores (- ).

QUALIFIERS

/CEFCLUSTERS=cef
Specifies the total number of common event flag clusters permitted in the
multiport memory unit. The cef value is an integer with a default of 32.

/GBLSECTIONS=gbl
Specifies the total number of global sections permitted in the multiport
memory unit. The gbl value is an integer with a default of 32.

/MAILBOXES=mail
Specifies the total number of mailboxes permitted in the multiport memory
unit. The mail value is an integer with a default of 32.

/MAXCEFCLUSTERS=max-cef
Specifies the maximum number of common event flag clusters that the
processor can create in the multiport memory unit. The default is no limit.

/MAXGBLSECTIONS=max-gbl
Specifies the maximum number of global sections that the processor can
create in the multiport memory unit. The default is no limit.

/MAXMAILBOXES=max-mail
Specifies the maximum number of mailboxes the processor can create in the
multiport memory unit. The default is no limit.

/POOLBCOUNT=block-cnt
Specifies the number of blocks allocated to the multiport memory unit's
dynamic pool. The block-cnt value is an integer with a default of 128.

/POOLBSIZE=block-size
Specifies the size of each block in the dynamic pool. The block-size value is
an integer with a default of 128 bytes.

SGN-29

SYSGEN
SHARE/INITIALIZE

/PRQCOUNT=prq-cnt
Specifies the number of interprocessor request blocks (PRQs) allocated. The
prq-cnt value is an integer with a default of 64.

DESCRIPTION

If the specified multiport memory unit is already initialized and connected to
other active processors, the gbl, mail, cef, block-cnt, block-size, and
prq-cnt parameter values are ignored, and the unit is simply connected to the
processor.

EXAMPLE
SYSGEN> SHARE MPM1 SHR_MEM_1/INITIALIZE SYSGEN> /GBLSECTIONS=128/MAILBOXES=64/CEFCLUSTERS=O

The command in this example initializes a multiport memory unit with
defaults on all but the gbl, mail, and cef parameters. In this example, assume
that the number of the multiport memory unit as it appears on the front panel
is 1, and the unit name is SHR_MEM_l.

SGN-30

SYSGEN
SHOW/ADAPTER

SHOW/ADAPTER
Lists all the nexus numbers and generic names on the adapter.
Use of the SHOW/ ADAPTER command requires the CMEXEC privilege.

FORMAT

SHOW/ADAPTER

PARAMETERS

None.

QUALIFIERS

None.

EXAMPLE
SYSGEN> SHOW/ADAPTER

The following is a sample display produced by the SHOW/ ADAPTER
command:
CPU Type: 11/780
Nexus Generic Name or Description
1 16K memory, non-interleaved
3 UBO
8
MBO
9
MB1

SGN-31

SYSGEN
SHOW/CONFIGURATION

SHOW/CONFIGURATION
Displays information on the device configuration.
Use of the SHOW/CONFIGURATION command requires the CMEXEC
privilege.

FORMAT

SHOW/CONFIGURATION

PARAMETERS

None.

QUALIFIERS

/ADAPTER=nexus
Specifies the number of MASSBUS or UNIBUS adapters to be displayed. The
nexus value can be expressed as an integer or with one of the generic names
listed by the SYSGEN command SHOW/ ADAPTER.

/COMMAND_F/LE
Specifies that SYSGEN formats all the device data into
CONNECT/ ADAPTER=adapter-spec commands and writes the commands
in an output file you specify. In this way, you can completely reconfigure
a system for UNIBUS devices without the use of the SYSGEN command
AUTOCONFIGURE.

/OUTPUT=file-spec
Specifies the file specification of an optional output file. If you specify the
/OUTPUT qualifier but omit the file type, the default is LIS. However, if you
specify /COMMAND_FILE and /OUTPUT qualifiers together, the default file
type for the output file is COM.

DESCRIPTION

SHOW /CONFIGURATION shows devices by name, number of units, nexus
number, and adapter type, as well as by CSR and vector addresses. You can
specify an output file with the /OUTPUT qualifier.
Note that you can remove a device from the middle of the floating addresses
without completely redoing jumpers to the CSR and vector addresses of the
remaining devices by following the steps outlined below:

SGN-32

Modify your site-independent STARTUP.COM file to invoke the
command file specified with the /OUTPUT qualifier instead of entering
an AUTOCONFIGURE ALL command.

Enter the SHOW /CONFIGURATION/COMMAND_FILE/OUTPUT
command to format and save the device data. If you must
bring the system down for service and remove a board,
SYS$SYSTEM:STARTUP.COM invokes your output file as a command
procedure when the system reboots, and the system automatically
configures the system's UNIBUS devices and MASSBUS devices for
you.

SYSGEN
SHOW/CONFIGURATION

Remember that a new version of SYS$SYSTEM:STARTUP.COM is provided
with each major release, so you would need to repeat any modifications
you have made to SYS$SYSTEM:STARTUP.COM after you install the new
version.

Note: Although this technique can offer a convenient short-term solution, you
should use AUTOCONFIGURE ALL when possible.

EXAMPLES

SHOW/CONFIGURATION

SYSGEN>

The command in this example displays the current system 1/0 database. The
following illustrates a typical display produced by this command:
System CSR and Vectors on 15-NOV-1988 13:49:26.84
Name: DRA
Name: DBA
Name: DBB
Name: DRB
Name: MTA
Name: DMA
Name: LPA
Name: DYA
Name: XMA
Name: XMB
Name: XMC
Name: TTA
Name: TTB
Name: TTC
Name: TTD
Name: TTE
Name: TTF

Units:
Units:
Units:
Units:
Units:
Units:
Units:
Units:
Units:
Units:
Units:
Units:
Units:
Units:
Units:
Units:
Units:

SYSGEN>

3
1
2
1
2
2
1
2
1
1
1
8
8
8
8
8
8

Nexus:4
Nexus:4
Nexus:5
Nexus:5
Nexus:5
Nexus:8
Nexus:8
Nexus:8
Nexus:8
Nexus:8
Nexus:8
Nexus:8
Nexus:8
Nexus:8
Nexus:8
Nexus:8
Nexus:8

(MBA)
(MBA)
(MBA)
(MBA)
(MBA)
(UBA) CSR: 777440
(UBA) CSR: 777514
(UBA) CSR: 777170
(UBA) CSR: 760070
(UBA) CSR: 760100
(UBA) CSR: 760110
(UBA) CSR: 760130
(UBA) CSR: 760140
(UBA) CSR: 760150
(UBA) CSR: 760160
(UBA) CSR: 760170
(UBA) CSR: 760200

Vector1: 210
Vector1: 200
Vector1: 264
Vector1: 300
Vector1: 310
Vector1: 320
Vector1: 330
Vector1: 340
Vector1: 350
Vector1: 360
Vector1: 370
Vector1: 400

Vector2:
Vector2:
Vector2:
Vector2:
Vector2:
Vector2:
Vector2:
Vector2:
Vector2:
Vector2:
Vector2:
Vector2:

000
000
000
304
314
324
334
344
354
364
374
404

SHOW/CONFIGURATION/COMMAND_FILE/OUTPUT=CONFIG.COM

The command in this example formats all device data into
CONNECT/ ADAPTER=adapter-spec commands and writes the commands
to the command file CONFIG.COM. The following is a typical command file
produced by this command:
$ RUN SYS$SYSTEM:SYSGEN
AUTOCONFIGURE 4
AUTOCONFIGURE 5
CONNECT DMAO /ADAP=8 /CSR=%0777440 /VECT=%0210 /NUMV=01 /DRIVER=DMDRIVER
CONNECT DMA1 /ADAP=8 /CSR=%0777440 /VECT=%0210 /NUMV=01 /DRIVER=DMDRIVER
CONNECT LPAO /ADAP=8 /CSR=%0777514 /VECT=%0200 /NUMV=01 /DRIVER=LPDRIVER
CONNECT DYAO /ADAP=8 /CSR=%0777170 /VECT=%0264 /NUMV=01 /DRIVER=DYDRIVER
CONNECT DYA1 /ADAP=8 /CSR=%0777170 /VECT=%0264 /NUMV=01 /DRIVER=DYDRIVER
CONNECT XMAO /ADAP=8 /CSR=%0760070 /VECT=%0300 /NUMV=02 /DRIVER=XMDRIVER
CONNECT XMBO /ADAP=8 /CSR=%0760100 /VECT=%0310 /NUMV=02 /DRIVER=XMDRIVER
CONNECT XMCO /ADAP=8 /CSR=%0760110 /VECT=%0320 /NUMV=02 /DRIVER=XMDRIVER
CONNECT TTAO /ADAP=8 /CSR=%0760130 /VECT=%0330 /NUMV=02 /DRIVER=DZDRIVER
CONNECT TTA1 /ADAP=8 /CSR=%0760130 /VECT=%0330 /NUMV=02 /DRIVER=DZDRIVER
CONNECT TTA2 /ADAP=8 /CSR=%0760130 /VECT=%0330 /NUMV=02 /DRIVER=DZDRIVER

CONNECT TTF7 /ADAP=8 /CSR=%0760200 /VECT=%0400 /NUMV=02 /DRIVER=DZDRIVER

SGN-33

SYSGEN
SHOW/DEVICE=device-driver

SHOW/DEVICE=device-driver
Displays full information on device drivers loaded into the system, the
devices connected to them, and their 1/0 databases. All addresses are in
hexadecimal and are virtual.
Use of the SHOW /DEVICE=device-driver command requires the CMEXEC
privilege.

FORMAT

SHOW/DEVICE=device-driver

PARAMETERS

None.

QUALIFIERS

None.

DESCRIPTION

The SHOW /DEVICE=device-driver command specifies that the following
information be displayed about the specified device driver:
Driver

Name of the driver

Start

Starting address of the driver

End

Ending address of the driver

Dev

Name of each device connected to the driver

DOB

Address of the device's device data block

CRB

Address of the device's channel request block

IDB

Address of the device's interrupt dispatch block

Unit

Number of each unit on the device

UCB

Address of each unit's unit control block

By default, if you omit the driver name, information is displayed for all device
drivers loaded into the system.

EXAMPLE
SYSGEN> SHOW/DEVICE=DBDRIVER

The command in this example displays the following information about the
DB DRIVER:
__ Driver _____ Start ____ End ____ Dev ___ DDB ______ CRB ______ IDB _____ Unit __UCB ___ _
DBDRIVER
80082390 80082A7E
DBA 80000848 800988CO 80098920
0 8000087C
1 8008A4FO
2 8008A590
5 8008A630
7 8008A6DOO

SGN-34

SYSGEN
SHOW/DRIVER=device-driver

SHOW/DRIVER=device-driver
Displays the starting and ending address of the specified device driver
loaded into the system. If you omit the driver name, SHOW /DRIVER
displays the starting and ending address of all device drivers loaded into
the system. All addresses are in hexadecimal and are virtual.
Use of the SHOW /DRIVER command requires the CMEXEC privilege.

FORMAT

SHOW/DRIVER=device-driver

PARAMETERS

None.

QUALIFIERS

None.

EXAMPLE
SYSGEN>

SHOW/DRIVER

The command in this example displays the starting and ending addresses of
all drivers, as follows:
__ Driver _____ Start ____ End __ _
RTTDRIVER 800C1060 800C1960
NETDRIVER 800BAFDO 80080480
TMDRIVER
80083950 80084BFO
DRDRIVER 80082950 80083290
DDDRIVER
80081740 80082060
DLDRIVER 80080010 800815AO
DMDRIVER
80080070 80080990
LCD RIVER
800AFC50 800AFF80
800AED20 800AF3EO
YCDRIVER
XGDRIVER
800AC3FO 800AE9EO
XDDRIVER
800AA5AO 800AC380
DZDRIVER
800A4F30 800A5980
XMDRIVER
800A3E10 800A4A50
DYDRIVER
800A3300 800A3C30
LPDRIVER
800A2E90 800A3300
D8DRIVER
800DE7AO 800DEF87
TTDRIVER
800DC770 800DE798
OPERATOR
80001650 80001F8B
NLDRIVER
80001626 80001020
M8DRIVER
800015FC 80001C8E

SGN-35

SYSGEN
SHOW [parameter]

SHOW [parameter]
Displays the values of system parameters in the SYSGEN work area, plus
the default, minimum, and maximum values of the parameters and their
units of measure.

FORMAT
PARAMETER

SHOW {parameter-name}
parameter-name
Specifies the name of a system parameter. If you enter a period (. ), it is
interpreted as a request for the system parameter specified in the last SET
parameter-name or SHOW [parameter] command.

QUALIFIERS

/ACP
Specifies that all ACP parameter values are displayed.

/ALL
Specifies that all parameter values other than SPECIAL parameter values are
displayed.

/CLUSTER
Specifies that all CLUSTER parameter values are displayed.

/DYNAMIC
Specifies that all DYNAMIC parameter values are displayed.

/GEN
Specifies that all GEN parameter values are displayed.

/HEX
Specifies that the values of parameters be displayed in hexadecimal
representation. Specify the /HEX system parameter name or the parameter
type. If you specify the /HEX qualifier with the /NAMES qualifier, /HEX is
ignored.

/JOB
Specifies that all JOB parameter values are displayed.

/LG/
Specifies that all LGI parameter values are displayed.

/MAJOR
Specifies that all MAJOR parameter values are displayed.

/MULTIPROCESSING
Specifies that all MULTIPROCESSING parameters are displayed.

/NAMES
Specifies that the names of all parameters are displayed.

SGN-36

SYSGEN
SHOW [parameter]

/PQL
Specifies that all PQL parameter values are displayed.

/RMS
Specifies that all VAX RMS parameter values are displayed.

/SCS
Specifies that all SCS parameter values are displayed.

/SPECIAL
Specifies that all parameter values reserved for DIGITAL use are displayed.

/SYS
Specifies that all SYS parameter values are displayed.

/TTY
Specifies that all terminal parameter values are displayed.

DESCRIPTION

Parameter values are displayed in decimal unless the /HEX qualifier is
specified. Note that ASCII values are displayed in ASCII by default.
When parameter names are abbreviated, the first parameter matching
the abbreviation is selected for display. No ambiguity checks are made.
For example, a specification of SHOW GBL displays the GBLSECTIONS
parameter. To display the GBLP AGFIL parameter, you must specify SHOW
GBLP AGF (to avoid further ambiguity with the GBLP AGES parameter).
You can use a period ( . ) to indicate that you want to work with the system
parameter that was specified in the last SET parameter-name or SHOW
[parameter] command.

EXAMPLES

SYSGEN> SHOW GBLSECTIONS
GBLSECTIONS
100
SYSGEN> SET . 110
SYSGEN> SHOW
GBLSECTIONS
110

-1

Sections

-1

Sections

In this example, the user first displays the values of the GBLSECTIONS
parameter and then refers to the parameter with a period to set its current
value to 110. The next SHOW command also uses the period notation to
obtain confirmation that the change occurred.

SGN-37

SYSGEN
SHOW [parameter]
~

SYSGEN> SHOW/ACP

The command in this example produces the following output:
Parameters in use: Active
Parameter Name
ACP_MULTIPLE
ACP_SHARE
ACP_MAPCACHE
ACP_HDRCACHE
ACP_DIRCACHE
ACP_DINDXCACHE
ACP_WORKSET
ACP_FIDCACHE
ACP_EXTCACHE
ACP_EXTLIMIT
ACP_QUOCACHE
ACP_SYSACC
ACP_MAXREAD
ACP_WINDOW
ACP_WRITEBACK
ACP_DATACHECK
ACP_BASEPRIO
ACP_SWAPFLGS
ACP_XQP_RES
ACP_REBLDSYSD

Current
Minimum Maximum Unit Dynamic
Default
0
1
0
1 Boolean
D
1
1 Boolean
1
0
-1 Pages
52
1
D
8
-1 Pages
138
128
2
D
138
-1 Pages
80
2
D
37
25
2
-1 Pages
D
-1 Pages
0
0
0
D
-1 File-Ids
64
64
0
D
64
-1 Extents
64
0
D
300
0
1000 Percent/10 D
300
130
-1 Users
64
0
D
4
0
-1 Directories D
8
32
1
64 Blocks
32
D
-1 Pointers
7
7
1
D
1
1 Boolean
1
0
D
3 Bit-mask
2
2
0
D
4
31 Priority
8
8
D
14
15
15 Bit-mask
0
D
1
1
1 Boolean
0
1
1 Boolean
0
0

SYSGEN> SHOW/ACP/HEX

The command in this example produces a hexadecimal display of the values
of the ACP system parameters, as follows:
Parameters in use: Active
Parameter Name
Current
ACP_MULTIPLE
00000000
ACP_SHARE
00000001
ACP_MAPCACHE
00000034
ACP_HDRCACHE
0000008A
ACP_DIRCACHE
0000008A
ACP_DNDXCACHE
00000025
ACP_WORKSET
00000000
ACP_FIDCACHE
00000040
ACP_EXTCACHE
00000040
ACP _EXTLIMIT
0000012C
ACP_QUOCACHE
00000082
ACP_SYSACC
00000004
ACP_MAXREAD
00000020
ACP_WINDOW
00000007
ACP_WRITEBACK
00000001
ACP_DATACHECK
00000002
ACP_BASEPRIO
00000008
ACP_SWAPFLGS
OOOOOOOE
ACP_XQP_RES
00000001
ACP_REBLDSYSD
00000000

SGN-38

Minimum
Default
00000001 00000000
00000001 00000000
00000008 00000001
00000080 00000002
00000050 00000002
00000019 00000002
00000000 00000000
00000040 00000000
00000040 00000000
0000012C 00000000
00000040 00000000
00000008 00000000
00000020 00000001
00000007 00000001
00000001 00000000
00000002 00000000
00000008 00000004
OOOOOOOF 00000000
00000001 00000000
00000001 00000000

Maximum Unit Dynamic
00000001 Boolean
D
00000001 Boolean
FFFFFFFF Pages
D
FFFFFFFF Pages
D
FFFFFFFF Pages
D
FFFFFFFF Pages
D
FFFFFFFF Pages
D
FFFFFFFF File-Ids
D
FFFFFFFF Extents
D
000003E8 Percent/10 D
FFFFFFFF Users
D
FFFFFFFF Directories D
00000040 Blocks
D
FFFFFFFF Pointers
D
00000001 Boolean
D
00000003 Bit-mask
D
0000001F Priority
D
OOOOOOOF Bit-mask
D
00000001 Boolean
00000001 Boolean

SYSGEN
SHOW/STARTUP

SHOW/STARTUP
Displays the name of the current site-independent startup command
procedure.

FORMAT

SHOW/STARTUP

PARAMETERS

None.

QUALIFIERS

None.

EXAMPLE
SYSGEN> SHOW/STARTUP
Startup command file = SYS$SYSTEM:STARTUP.COM

The command in this example displays the name of the site-independent
startup command procedure.

SGN-39

SYSGEN
SHOW/UNIBUS

SHOW/UNIBUS
Displays the addresses in UNIBUS 1/0 space that can be addressed.
Use of the SHOW /UNIBUS command requires the CMKRNL privilege.

FORMAT

SHOW/UNIBUS

PARAMETERS

None.

QUALIFIER

/ADAPTER[=nexus]
Specifies that the address of the specified UNIBUS adapter is to be displayed.
The nexus value specifies the number of the UNIBUS. It can be expressed as
an integer or as one of the names listed by the SYSGEN command
SHOW/ ADAPTER. If you do not specify a particular adapter, every UNIBUS
is displayed.

DESCRIPTION

The SHOW /UNIBUS command reads all device registers. For some
controllers, the result might be reading a character out of a buffer or some
other undesired action. Therefore, use the SHOW /UNIBUS command only
when you need to debug a UNIBUS configuration.

Note: Never use the SHOW /UNIBUS command on a running system. Use of
this command is valid only during a conversational bootstrap.

EXAMPLE
SYSGEN>

SHOW/UNIBUS/ADAPTER=4

The command in this example displays the available addresses for nexus 4, as
follows:
**UNIBUS map for nexus #4 on 30-DEC-1988

14:19:38.00 **

Address 760070 (8001F838) responds with value 9B6E (hex)
Address 760072 (8001F83A) responds with value 0340 (hex)
Address 760074 (8001F83C) responds with value 403C (hex)
Address 760076 (8001F83E) responds with value 0240 (hex)
Address 760100 (8001F840) responds with value 8000 (hex)
Address 760102 (8001F842) responds with value 0340 (hex)
Address 760104 (8001F844) responds with value 7DAC (hex)
Address 760106 (8001F846) responds w~th value OOOA (hex)
Address 760110 (8001F848) responds with value 8000 (hex)
Address 760112 (8001F84A) responds with value 0340 (hex)
Address 760114 (8001F84C) responds with value AD5C (hex)
Address 760116 (8001F84E) responds with value OOOA (hex)

SGN-40

SYSGEN
SHOW/UNIBUS

Address 760130 (8001F858) responds with value 9B6E (hex)
Address 760132 (8001F85A) responds with value 0300 (hex)
Address 760134 (8001F85C) responds with value FFOO (hex)
Address 760136 (8001F85E) responds with value CECE (hex)
Address 760140 (8001F860) responds with value 4060 (hex)
Address 760142 (8001F862) responds with value 0761 (hex)
Address 760144 (8001F864) responds with value FFOO (hex)

SGN-41

SYSGEN
TERMINAL/ECHO

TERMINAL/ECHO
Modifies the CTRL/C, CTRL/O, CTRL/Y, and CTRL/Z echo strings on a
systemwide basis.

FORMAT

TERMINAL/ECHO

PARAMETERS

None.

QUALIFIERS

None.

DESCRIPTION

Before entering the TERMINAL/ECHO command, edit the file
SYSGTTSTR.MSG in SYS$EXAMPLES. The file contains detailed instructions
for the editing procedure.
When you enter the TERMINAL/ECHO command after editing the file, the
modifications you have specified are carried out.

SGN-42

SYSGEN
USE

USE
Initializes the SYSGEN work area with system parameter values and the
name of the site-independent startup command procedure. You specify
the source for both the parameter values and the procedure name. They
can be retrieved from a parameter file, the current system parameter file
on disk, the active system in memory, or the default list.
Existing values in the SYSGEN work area are overwritten.

FORMAT
PARAMETEF\

USE

file-spec

file-spec
The file specification of a system parameter file from which data is to be
retrieved. The parameter file is either SYS$SYSTEM:AUTOGEN.PAR or the
name of a parameter file you created with the SYSGEN command WRITE.
The default file type is PAR.
In place of a file specification, you can specify one of the following keywords:
CURRENT
Specifies that source information is to be retrieved from the current system
parameter file on disk.
ACTIVE
Specifies that source information is to be retrieved from the active system in
memory.
DEFAULT
Specifies that source information is to be retrieved from the default list.

QUALIFIERS

None.

EXAMPLE
SYSGEN> USE DEFAULT

The command in this example initializes the SYSGEN work area with
parameter values that should allow VMS to boot on any standard
configuration. The initial values of the SYSGEN work area when the utility is
invoked are the active values.

SGN-43

SYSGEN
WRITE

WRITE
Writes the system parameter values and the name of the site-independent
startup command procedure from the SYSGEN work area to either a
parameter file, the current system parameter file on disk, or the active
system in memory. (Only the dynamic parameter values are written to the
active system.)
Use of the WRITE ACTIVE command requires the CMKRNL privilege. Use
of the WRITE CURRENT command requires the SYSPRV privilege.

FORMAT
PARAMETER

WRITE

file-spec

file-spec
The file specification of a new parameter file to be created. The default file
type is PAR.
In place of a file specification, you can specify one of the following keywords:
CURRENT
Specifies that source information is to be written to the current system
parameter file on disk.
ACTIVE
Specifies that source information is to be written to the active system in
memory.
DEFAULT
Specifies that source information is to be written to the default list.

QUALIFIERS

None.

DESCRIPTION

Both the WRITE ACTIVE and WRITE CURRENT commands send a message
to OPCOM and log the event.

EXAMPLES
(J

SYSGEN> WRITE SYS$SYSTEM:SPECIAL

The command in this example creates a new parameter specification file.
~

SYSGEN> WRITE CURRENT

The command in this example modifies the current system parameter file on
disk (SYS$SYSTEM:VAXVMSSYS.PAR).

SGN-44

Supplemental SYSGEN Information

This appendix describes the functions of the VMS system parameters.

A. 1

Parameter Categories
The system parameters can be divided into the following categories:
•

ACP-Parameters associated with file system caches and Files-11
ancillary control processes (ACPs).

•

CLUSTER-Parameters that affect VAXcluster operation.

•

JOB-Job control parameters.

•

LGI-Login security parameters.

•

PQL-Parameters associated with process creation limits and quotas.

•

RMS-Parameters associated with VMS RMS.

•

SCS-Parameters that control System Communication Services (SCS) and
port driver operation. The parameters that affect SCS operation have the
prefix SCS. The parameters that affect the CI780 /CI750 port driver have
the prefix PA.

•

SPECIAL-Special parameters used by DIGITAL. These parameters
should be used only by DIGITAL personnel.

•

SYS-Parameters that affect overall system operation.

•

TTY-Parameters associated with terminal behavior.

There are also four parameters that can be user-defined: USERDl, USERD2,
USER3, and USER4. USERDl and USERD2 are dynamic.
Parameters can have one or more of the following attibutes:
•

DYNAMIC-Active values can be modified.

•

GEN-Affect the creation and initialization of data structures at bootstrap
time.

•

MAJOR-Most likely to require modification.

These attributes are noted in the detailed parameter descriptions in
Section A.2.
Each parameter has associated default, minimum, and maximum values that
define the scope of allowable values. To determine these values, invoke
SYSGEN and enter a SHOW [parameter-name] command (with appropriate
qualifiers). For example, to display the values for WSMAX, you can specify
SHOW WSMAX; to display the values for the TTY parameters, you can
specify SHOW /TTY. You can also display parameters grouped by attibutes.
To display DYNAMIC parameters, for example, specify SHOW /DYNAMIC.

A-1

Supplemental SYSGEN Information
A.1 Parameter Categories

Following is a list of system parameters grouped according to category. An
asterisk indicates that a parameter is dynamic.
ACP Parameters
ACP_BASEPRIO*

ACP_DAT ACHECK*

ACP_DINDXCACHE*

ACP_DIRCACHE*

DJTOUOTA*

ACP_EXTCACHE*

ACP_EXTLIMIT*

ACP_FIDCACHE*

ACP_HDRCACHE*

ACP_MAPCACHE*

ACP_MAXREAD*

MJTOUOTA

ACP_MULTIPLE*

ACP_QUOCACHE*

ACP_REBLDSYSD

ACP_SHARE*

ACP_SWAPFLGS*

ACP_SYSACC*

ACP_WINDOW*

ACP_WRITEBACK*

ACP_WORKSET*

ALLOCLASS*

DISK_QUORUM*

EXPECTED_VOTES

LOCKDIRWT

MSCP_BUFFER

MSCP_CREDITS

ACP_XQP_RES*

CLUSTER Parameters

MSCP_LOAD

MSCP_SERVE_ALL

NISCS_CONV_BOOT

NISCS_LOAD_PEAO

NISCS_PORT_SERV

RECNXINTERVAL*

ODSKINTERV AL

ODKSVOTES

VAXCLUSTER

BJOBLIM*

DEFPRI*

DEFOUEPRI*

IJOBLIM*

MAXOUEPRI*

NJOBLIM~

LGl _BRK_DISUSER*

LGl _BRK_LIM*

LGl_BRK_TERM*

LGl_BRK_TMO*

LGl_HID_TIM*

LGl _RETRY_LIM*

VOTES

JOB Parameters

RJOBLIM*

LGI Parameters

LGl _RETRY_ TMO*

MULTIPROCESSING Parameters

A-2

MULTIPROCESSING

SMP_CPUS

SMP_SANITY

SMP_SPINWAIT

SMP_LNGSPINW AIT

Supplemental SYSGEN Information
A.1 Parameter Categories

POL Parameters
PQL_DASTLM*

PQL _DBIOLM*

PQL_DBYTLM*

PQL_DCPULM*

PQL _DDIOLM*

PQL_DENQLM*

PQL _DFILLM*

PQL_DPGFLQUOT A*

PQL _DPRCLM*

POL _DTQELM*

PQL _DWSDEFAUL T

PQL_DWSEXTENT*

PQL _DWSQUOT A*

PQL _MASTLM*

PQL _MBIOLM*

PQL _MBYTLM*

PQL _MCPULM*

PQL _MDIOLM*

PQL _MENOLM*

PQL _MFILLM*

PQL_MPGFLQUOT A*

PQL _MPRCLM*

PQL _MTQELM*

PQL_MWSDEFAULT

PQL _MWSEXTENT *

PQL_MWSOUOT A*

RMS Parameters
RMS_DFMBC*

RMS_DFMBFSDK*

RMS_DFMBFSMT*

RMS_DFMBFSUR*

RMS_DFMBFREL *

RMS_DFMBFIDX*

RMS_DFMBFHSH*

RMS_DFNBC*

RMS_PROLOGUE*

RMS_EXTEND_SIZE*

RMS_FILEPROT

RMS_GBLBUFQUO*

SCSBUFFCNT

SCSCONNCNT

SCSRESPCNT

SCSMAXDG

SCSMAXMSG

SCSFLOWCUSH*

SCSSYSTEMID

SCSSYSTEMIDH

SCSNODE

PRCPOLINTERVAL*

PASTIMOUT*

PASTDGBUF

PANUMPOLL*

PAMAXPORT*

PAPOLLINTERV AL*

PAPOOLINTERVAL*

PASANITY*

PANOPOLL*

CHANNELCNT

CONCEAL_DEVICES

DLCKEXTRASTK

EXUSRSTK

IMGIOCNT

IOTA

LOCKRETRY

LPRMIN

MPW_PRIO

NOAUTOCONFIG

NOCLOCK

NOCLUSTER

PAGTBLPFC

PFRATS

PHYSICALPAGES

SCS Parameters

UDABURSTRA TE

Special Parameters

PIXSCAN

PSEUDOLOA

QBUS_MUL T_INTR

RESALLOC

SO_PAGING

SMP_ TICK_CNT

SRPMIN

SSINHIBIT

SWP_PRIO

A-3

Supplemental SYSGEN Information
A.1 Parameter Categories

Special Parameters
SWP ALLOCINC

SWPFAIL

SWPRATE

SYSPFC

TBSKIPWSL

VMS

WRIT ABLESYS

SYS Parameters
AWSMIN*

AWSTIME*

BALSETCNT

BORROWLIM*

BUGCHECKFAT AL*

BUGREBOOT*

CLISYMTBL*

CRDENABLE

DEADLOCK_ WAIT*

DEFMBXBUFOUO*

DEFMBXMXMSG*

DEFMBXNUMMSG*

DEFPRI*

DISMOUMSG*

DORMANTWAIT*

DUMPBUG

DUMPSTYLE

ERRORLOGBUFFERS

EXTRA CPU*

FREEGOAL

FREE LIM

GBLPAGES

GBLPAGFIL

GBLSECTIONS

GROWLIM*

INTSTKPAGES

IRPCOUNT

IRPCOUNTV

LAMAPREGS

LNMPHASHTBL

LNMSHASHTBL

LOCKIDTBL

LOCKIDTBL_MAX*

LONGWAIT*

LRPCOUNT

LRPCOUNTV

LRPSIZE

MAXBUF*

MAXPROCESSCNT

MAXSYSGROUP*

MINWSCNT

MOUNTMSG*

MPW_HILIMIT

MPW _IOLIMIT

MPW_LQLIMIT

MPW_LOWAITLIMIT*

MPW_THRESH*

MPW_WAITLIMIT*

MPW_ WRTCLUSTER

MVTIMEOUT*

NPAGEDYN

NPAGEVIR

PAGEDYN

PAGFILCNT

PFCDEFAULT*

PFRATH*

PFRATL*

PROCSECTCNT

QUANTUM*

REAL TIME_SPTS

RESHASHTBL

SAVEDUMP

SETTIME

SPTREQ

SRPCOUNT

SRPCOUNTV

STARTUP_P1-8

SWPFILCNT

SWPOUTPGCNT*

SYSMWCNT

T APE_MVTIMEOUT*

TIMEPROMPTWAIT

UAFALTERNATE

VIRTUALPAGECNT

WINDOW _SYSTEM

WSDEC*

WSINC*

WSMAX

TTY_AL TYPAHD

TTY_ALT ALARM

TTY;_AUTOCHAR

TTY_BUF

TTY_CLASSNAME

TTY_DEFCHAR

TTY_DEFCHAR2

TTY_DIALTYPE

TTY_DMASIZE*

XFMAXRATE*

TTY Parameters

A-4

Supplemental SYSGEN Information
A.1 Parameter Categories

TTY Parameters

A.2

TTY_QWNER

TTY_PARITY

TTY_PROT

TTY_RSPEED

TTY_SCANDEL TA

TTY_SILOTIME

TTY_SPEED

TTY_TIMEOUT

TTY_TYPAHDSZ

Parameter Descriptions
This section describes system parameters and provides guidelines to help
you decide whether you should consider modifying them. The parameters
are presented in alphabetical order, and the attributes DYNAMIC, GEN, and
MAJOR are indicated as follows:
DYNAMIC-D
GEN-G
MAJOR-M
Default values for SYSGEN parameters allow booting on any supported
VMS configuration and are usually adequate. SYSGEN displays these default
values under the heading "default" when you enter the SYSGEN command
SHOW [parameter] for one of the parameter categories or attributes. Reset the
default parameter values with the USE DEFAULT command.
The computed, installed value referred to in this section is the value derived
by the AUTOGEN command procedure (see the Guide to Maintaining a VMS

System).
Descriptions for the SPECIAL system parameters are listed in a separate
section at the end of the appendix.

Note: In versions of the VMS operating system before Version 4.0, a separate
process, the Ancillary Control Process (ACP), performed file operations
such as file opens, closes, and window turns. Version 4.0 introduced the
XQP (extended QIO procedure), which allows every process on the system
to perform these operations. Consequently, many ACP parameters are
applicable only when Files-11 structure level 1 disks are mounted or
when an ACP is specifically requested during a mount command. For
compatibility reasons, the names of the parameters have not changed.
System Parameters
ACP_BASEPRIO (D)
ACP_BASEPRIO sets the base priority for all ACPs. The DCL command SET
PROCESS /PRIORITY can be used to reset the base priorities of individual
ACPs. ACP_BASEPRIO is not applicable for XQPs.
ACP_DATACHECK (D)
ACP_DATACHECK enables verification of reading and writing of file structure
data (for example, directories and file headers). A specification of 3 means
read and write checks; 2 means write check only; 1 means read check only;
0 means no checks. On a read check, the XQP information is read twice and
compared. On a write check, the XQP information is written, and then read
and compared.

A-5

Supplemental SYSGEN Information
A.2 Parameter Descriptions

ACP_DIRCACHE (D)
ACP_DIRCACHE sets the number of pages for caching directory blocks. Too
small a value causes excessive XQP 1/0 operations, while too large a value
causes excessive physical memory to be consumed by the directory data block
cache.
ACP_DINDXCACHE (D)
ACP_DINDXCACHE controls the size of the directory index cache and the
number of buffers used on a cache-wide basis. In addition,
ACP_DINDXCACHE builds a temporary index into the directory file, thereby
reducing search time and directory header lookup operations. This parameter
replaces the ACP_SYSACC parameter for Files-11 ODS-2 disks.
ACP_EXTCACHE (D)
ACP_EXTCACHE sets the number of entries in the extent cache. Each entry
points to one contiguous area of free space on disk. A specification of 0
means no cache. Too small a value causes excessive XQP 1/0 operations,
while too large a value causes excessive physical memory to be consumed by
the extent cache.
ACP_EXTLIMIT (D)
ACP_EXTLIMIT specifies the maximum amount of free space to which the
extent cache can point, expressed in thousandths of the currently available
free blocks on the disk. For example, if available free space on the disk is
20,000 blocks, a specification of 10 limits the extent cache to 200 blocks.

The computed, installed value is usually adequate. Users with 4 or more
VAXcluster node systems may want to adjust this parameter.
ACP_flDCACHE (D)
ACP_FIDCACHE sets the number of file identification slots cached. A
specification of 1 means no cache. Too small a value causes excessive XQP
1/0 operations, while too large a value causes excessive physical memory to
be consumed by the FID caches.
ACP_HDRCACHE (D)
ACP_HDRCACHE sets the number of pages for caching file header blocks.
Too small a value causes excessive XQP 1/0 operations, while too large a
value causes excessive physical memory to be consumed by the file header
caches.
ACP_MAPCACHE (D)
ACP_MAPCACHE sets the number of pages for caching index file bit map
blocks. Too small a value causes excessive XQP 1/0 operations, while too
large a value causes excessive physical memory to be consumed by the bit
map cache.
ACP_MAXREAD (D)
ACP_MAXREAD sets the maximum number of direc~ory blocks read in one
1/0 operation.
ACP_MULTIPLE (D)
ACP_MUL TIPLE enables or disables the default creation of a separate disk
XQP cache for each volume mounted on a different device type. Prior to
Version 4.0, a separate ACP process was created for each device type if
this parameter was enabled. Since ACP operations are now handled by

A-6

Supplemental SYSGEN Information
A.2 Parameter Descriptions

the per process XQP, such separate processes are no longer created. In
general, there is no reason to have multiple caches. One large cache is more
efficient than several small ones. ACP_MULTIPLE can be overridden on an
individual-volume basis with the DCL command MOUNT.
ACP_QUOCACHE (D)
ACP_QUOCACHE sets the number of quota file entries cached. A
specification of 0 means no cache. Too small a value causes excessive XQP
I/O operations, while too large a value causes excessive physical memory to
be consumed by the quota caches.
ACP_REBLDSVSD
ACP_REBLDSYSD specifies whether the system disk should be rebuilt if it
was improperly dismounted with extent caching, file number caching, or disk
quota caching enabled. The ACP_REBLDSYSD default value ( 1 ) ensures that
the system disk is rebuilt.

Depending on the amount of caching enabled on the volume before it was
dismounted, the rebuild operation may consume a considerable amount of
time. Setting the value of ACP_REBLDSYSD to 0 specifies that the disk
should be returned to active service immediately. If you set
ACP_REBLDSYSD to 0, you can enter the DCL command SET
VOLUME /REBUILD at any time to rebuild the disk.
ACP_SHARE (D)
ACP_SHARE enables or disables the creation of a global section for the
first ACP used, enabling succeeding ACPs to share its code. This parameter
should be set on ( 0) when ACP_MULTIPLE is on.
ACP_SWAPFLGS (D)
ACP_SWAPFLGS enables or disables swap through the value of a 4-bit
number for the following four classes of ACPs:
Bit

Class of ACP

Disks mounted by MOUNT /SYSTEM

Disks mounted by MOUNT /GROUP

Private disks

Magnetic tape ACP

If the value of the bit is 1, the corresponding class of ACPs can be swapped.
The value of decimal 15 (hexadecimal F-all bits on) enables swap for all
classes of ACP. A value of decimal 14 disables swap for ACPs for volumes
mounted with the /SYSTEM qualifier but leaves swap enabled for all other
ACPs. Note that one will only have disk ACPs present if they are specifically
requested at mount time or if a Files-11 structure level 1 disk is mounted. In
general, only bit 3 is significant since there will usually be no file ACPs.
ACP_SVSACC (D)
ACP_SYSACC sets the number of directory file control blocks (FCBs) that will
be cached for disks mounted with the /SYSTEM qualifier. Each directory FCB
contains a 16-byte array containing the first letter of the last entry in each
block of the directory (or group of blocks if the directory exceeds 16 blocks).
Since entries in a directory are alphabetical, the cached FCB provides quick
access to a required directory block. This parameter value should be roughly

A-7

Supplemental SYSGEN Information
A.2 Parameter Descriptions

equivalent to the number of directories that will be in use concurrently on
each system volume. It may be overridden on a per-volume basis with the
/ACCESSED qualifier to the DCL command MOUNT. The value should
be kept low in systems with small physical memory and little file activity,
because the FCBs require a significant amount of space in the nonpaged
dynamic pool.
Too small a value causes excessive XQP 1/0 operations, while too large a
value causes excessive physical memory to be consumed by the FCB caches.
ACP_WINDOW (D)
ACP_WINDOW sets the default number of window pointers to be allocated
in a window for a default file access, for disks mounted with the /SYSTEM
qualifier.
ACP_WORKSET (D)
ACP_WORKSET sets the default size of a working set for an ACP. A value of
0 permits the ACP to calculate the size. This value should be nonzero only
on small systems where memory is tight. Too small a value causes excessive
ACP page, while too large a value causes excessive physical memory to be
consumed by the ACP. Note that this parameter has no effect on the per
process XQP.
ACP_WRITEBACK (D)
ACP_WRITEBACK enables the deferred writing of file headers by default. A
specification of 0 causes all modifications of file headers to be written to disk
immediately.
ACP__)(QP_RES (D)
ACP_xQP_RES controls whether the XQP is currently in memory. The
default value (1), specifies that the XQP is permanently in memory. Change
the default only on restricted memory systems with a small number of users
and little or no file activity that would require XQP intervention. Such activity
includes file opens, closes, directory lookups, and window turns.
ALLOCLASS (D)
ALLOCLASS determines the device allocation class for the system. The
device allocation class is used to derive a common lock resource name for
multiple access paths to the same device.
AWSMIN (D)
AWSMIN establishes the lowest number of pages to which a working set limit
can be decreased by automatic working set adjustment.
AWSTIME (D)
AWSTIME specifies the minimum amount of processor time that must elapse
for the system to collect a significant sample of a working set's page fault rate.
The time is expressed in units of 10 milliseconds. The default value of 20, for
example, is 200 milliseconds.
BALSETCNT (G,M)
BALSETCNT sets the number of balance set slots in the system page table.
Each memory-resident working set requires 1 balance set slot. Each balance
set slot requires 4 bytes of permanently resident memory per 128 virtual
pages (as specified in the VIRTUALPAGECNT parameter).

A-8

Supplemental SYSGEN Information
A.2 Parameter Descriptions

You can monitor the active system with the DCL command SHOW MEMORY
or the MONITOR PROCESSES command of the Monitor Utility to determine
the actual maximum number of working sets in memory. If this number
is significantly lower than the value of BALSETCNT, this parameter value
may be lowered. If all balance set slots are being used, raise the value of
BALSETCNT.
BALSETCNT should never be set to a value higher than 2 less than
MAXPROCESSCNT. If physical memory is a significant system constraint,
you should consider lowering this value even further. However, if your
system runs with a number of processes nearly equal to MAXPROCESSCNT,
lowering BALSETCNT will force swapping to occur, which can affect system
performance.
BJOBLIM (D)
BJOBLIM enables the limit for batch jobs.
BORROWLIM (D,M)
BORROWLIM defines the minimum number of pages required on the free
page list before the system will permit process growth beyond the working
set quota (WSQUOTA) for the process. This parameter should always be
greater than FREELIM.

This parameter allows a process to grow beyond the value set by the working
set quota (WSQUOTA) to the working set quota extent (WSEXTENT) on a
system that has a substantial memory on the free page list. This automatic
working set adjustment also depends upon the values of parameters WSINC,
PFRATH, and AWSTIME.
Working set growth attempts to alleviate heavy page faulting. To make use
of this growth, you must also set the user's WSEXTENT authorization quota
to a larger number than the WSQUOTA value.
BUGCHECKFATAL (D)
BUGCHECKFATAL enables or disables the conversion of nonfatal bugchecks
into fatal bugchecks. The system must be rebooted on a fatal bugcheck.
A nonfatal bugcheck places an entry only in the error log and deletes the
corresponding process.

This parameter should normally be off ( 0 ); you should set it on ( 1 ) only
when the executive is being debugged.
BUGREBOOT (D)

BUGREBOOT enables or disables automatic rebooting of the system if a fatal
bugcheck occurs. This parameter should normally be on ( 1 ); set it off ( 0)
only when the executive is being debugged.
CLISYMTBL (D)

CLISYMTBL sets the size of the command interpreter symbol table, which
controls the number of DCL or MCR symbols that can be created.
CRDENABLE
CRDENABLE enables or disables detection and logging of memory-corrected
read data (ECC) errors. This parameter should normally be on ( 1 ).

A-9

Supplemental SYSGEN Information
A.2 Parameter Descriptions

DEADLOCK_WAIT (D)
DEADLOCK-WAIT defines the number of seconds that a lock request
must wait before the system initiates a deadlock search on behalf of that
lock. Setting DEADLOCK_WAIT to 0 disables deadlock checking. Setting
DEADLOCK-WAIT to a value greater than 0 but still less than the default
setting provides faster detection of deadlocks but requires more CPU usage.
DEFMBXBUFQUO (D)
DEFMBXBUFQUO sets the default for the mailbox buffer quota size in bytes
when this value is not specified in a Create Mailbox ($CREMBX) system
service call.
DEFMBXMXMSG (D)
DEFMBXMXMSG sets the default for the mailbox maximum message size in
bytes when this value is not specified in a Create Mailbox ($CREMBX) system
service call.
DEFMBXNUMMSG (D)
DEFMBXNUMMSG enables the default number of messages for mailbox
creation.
DEFPRI (D)
DEFPRI sets the base default priority for processes.
DEFQUEPRI (D)
DEFQUEPRI establishes the scheduling priority for jobs entered in batch and
output (printer, server, and terminal) queues when no explicit scheduling
priority is specified by the submitter. The value of this parameter can range
from 0 to 255; the default value is 100.

The value of DEFQUEPRI should be less than or equal to MAXQUEPRI.

Note: DEFQUEPRI refers to relative queue scheduling priority, not the
execution priority of the job.
DISK_QUORUM (D)
The DISK_QUORUM parameter is the name of an optional quorum disk in
ASCII. ASCII spaces indicate that no quorum disk is being used.
DISMOUMSG (D)
DISMOUMSG controls whether the messages that log volume dismounts
appear on the operator's terminal and in the operator's log. The default value
of 0 disables the reporting of these messages.
DORMANTWAIT (D)
DORMANTWAIT specifies, in seconds, the amount of time that can elapse
without a significant event before the system treats a low-priority computable
process as a DORMANT process for scheduling purposes. (A low-priority
process is a non-real-time process whose current priority is equal to or less
than the value specified by the SYSGEN parameter DEFPRI (default=4).)
After SUSP (suspended) processes, DORMANT processes are the most likely
candidates for memory reclamation by the swapper.

A-10

Supplemental SYSGEN Information
A.2 Parameter Descriptions

DUMPBUG

DUMPBUG enables or disables the writing of error log buffers and memory
contents to SYS$SYSTEM:SYSDUMP.DMP when a fatal bugcheck occurs.
This parameter should be off ( 0) only when the executive is being debugged.
DUMPSTYLE

DUMPSTYLE specifies the method of writing system dumps. Specify one of
the following values:
Value

Meaning

The entire contents of physical memory will be written to the dump
file. This is the default.
Selective portions of memory will be written to the dump file as space
permits.

If you have a large memory system and the dump file is too small to contain a

complete system dump of physical memory, set DUMPSTYLE to 1 to specify
a partial memory dump.
ERRORLOGBUFFERS

ERRORLOGBUFFERS specifies the amount of physical memory (in pages)
reserved for system error log entries.
If ERRORLOGBUFFERS is too low, messages might not be written to the
error log file. If it is too high, too many physical pages can be consumed by

the error log buffers.
If you increase ERRORLOGBUFFERS, you also need to increase the size
of the system dump file by an equal amount. For example, if you increase

ERRORLOGBUFFERS from 4 (the default) to 6, you must also increase the
size of the dump file by 2 blocks.
EXPECTED_VOTES

EXPECTED_VOTES specifies the maximum number of votes that may be
present in a VAXcluster at any given time. Set it to a value that is equal to
the sum of the vote parameters of all VAXcluster members, plus any votes
that are contributed by the quorum disk. This value is used to automatically
derive the number of votes that must be present for the VAXcluster to
function (quorum).
EXTRACPU (D)

EXTRACPU sets the time, in units of 10 milliseconds, allotted to each of a
process's exit handlers (for each access mode) after the process times out (that
is, reaches its CPU time limit).
FREEGOAL (M)

FREEGOAL establishes the number of pages that you want to reestablish on
the free page list following a system memory shortage. Memory shortages
occur when the system drops below the minimum number of pages required
on the free page list (FREELIM). The value of FREEGOAL must always be
greater than or equal to the value of FREELIM.

A-11

Supplemental SYSGEN Information
A.2 Parameter Descriptions

FREELIM (M)
FREELIM sets the minimum number of pages that must be on the free page
list. The system will write pages from the modified page list, swap out
working sets, or reduce the size of the working sets to maintain the minimum
count.

While the larger free page list generally means less page I/O, it also means
less space for the balance set, which tends to result in more swap I/O. You
can monitor the size of the free page list, the amount of page, and the amount
of swap with the MONITOR IO command of the Monitor Utility.
GBLPAGES (G,M)
GBLP AGES sets the number of global page table entries allocated at bootstrap
time. Each global section requires 1 global page table entry per section page,
plus 2 entries, with the total rounded up to an even number. Every 128
global page table entries add 4 bytes to permanently resident memory in the
form of a system page table entry.

The default value is sufficient for the images normally installed as shared in
the system startup command procedures. Once the system is running and all
global sections are created, you can examine the actual requirements with the
/GLOBAL qualifier of the Install Utility and reduce the value of GBLPAGES
accordingly. However, the value of this parameter should not be set too low,
since the page table entries use little permanently resident memory. If you
plan to install many user images as shared, or if user programs are likely to
create many global sections, you must increase the value of this parameter.
Note that as you increase GBLP AGES beyond its default setting, you must
make an adjustment to SYSMWCNT. For every 128 pages you add to
GBLPAGES, increase SYSMWCNT by 1.
GBLPAGFIL

GBLP AGFIL defines the maximum number of systemwide pages allowed for
global page-file sections (scratch global sections that can be used without
being mapped to a file). These global page-file sections can be temporary,
permanent, system, or group, and are allocated from the page file specified in
the system process header at bootstrap time. When you allow pages for global
page-file sections, you must increase the size of the page file accordingly.
Global page-file sections are created with the Create and Map Section
($CRMPSC) system service without an explicit disk file. These sections
are used for the VMS RMS global buffers required for shared files. Users of
shared files should note that global page-file sections cause both the global
page table and the default system page file (P AGEFILE.SYS) to be used. If the
value of GBLPAGFIL is too small, $CRMPSC issues an error message when
you attempt to create global page-file sections.
You need scratch global sections if you use VMS RMS global buffers. Each
file using global buffers requires, in the system page file, the file's bucket size
multiplied by the number of global buffers for that file. If the file's bucket
size varies, as with VMS RMS indexed files, use the maximum bucket size.
For shared sequential files, use the multi-block count of the first stream to
perform the $CONNECT service in place of the file's bucket size.
The default value for this parameter is adequate for most systems. However,
if your site uses VMS RMS global buffering to a significant extent, you may

need to raise the value of GBLP AGFIL. Use the /GLOBAL qualifier of the
Install Utility to examine the number of pages consumed by VMS RMS global

A-12

Supplemental SYSGEN Information
A.2 Parameter Descriptions

buffers. The global sections used by VMS RMS for global buffers have the
prefix RMS$ followed by 8 hexadecimal digits.
Global buffers are enabled with the DCL command SET
FILE/GLOBAL_BUFFERS, which is described in the VMS DCL Dictionary.
GBLSECTIONS (G,M)
GBLSECTIONS sets the number of global section descriptors allocated in the
system header at bootstrap time. Each global section requires 1 descriptor.
Each descriptor takes 32 bytes of permanently resident memory.

The default value is sufficient for the images normally installed as shared
in the system startup command procedures. Once the system is running
and all global sections are created, you can examine the actual requirements
with the /GLOBAL qualifier of the Install Utility and reduce the value of
GBLSECTIONS accordingly. However, the value of this parameter should
not be set too low. If you plan to install many user images as shared, or if
user programs are likely to create many global sections, you must increase the
value of this parameter.
If the value of GBLSECTIONS is too small, you receive a message from the
Install Utility at system startup time or whenever you install images manually.
Note that too large a value for GBLSECTIONS wastes physical memory.

GROWLIM (D,M)
GROWLIM sets the number of pages that the system must have on the free
page list so that a process can add a page to its working set when it is above
quota. GROWLIM has no effect if the process is below its working set quota.
GROWLIM acts as a fast shutoff to the working set extent mechanism based
on the system's free memory.
IJOBLIM (D)
IJOBLIM sets the maximum number of interactive jobs that can be on the
system concurrently. You can control the maximum number of concurrent
interactive users on the system with the DCL command SET
LOGINS /INTERACTIVE.
INTSTKPAGES (D,G,M)
INTSTKPAGES sets the size of the interrupt stack in pages. Each page on the
interrupt stack requires a page of permanently resident memory.

Use the default value of 2 unless interrupt-stack-not-valid exceptions occur.
These may be caused by either an unusually large number of devices or a
driver that requires a large amount of stack space.
IRPCOUNT (G,M)
IRPCOUNT sets the number of preallocated intermediate request packets.
Each packet requires 160 bytes of permanently resident memory. If
IRPCOUNT is too large, physical memory is wasted. If IRPCOUNT is
too small, the system increases its value automatically, as needed, to permit
proper performance. However, the system cannot increase IRPCOUNT
beyond the value of IRPCOUNTV.

There is a physical memory penalty for allowing this growth. If IRPCOUNT
is underconfigured, the penalty is 4 percent of physical memory from the
configured value to the actual value on the running system.
You can use the DCL command SHOW MEMORY/POOL/FULL to determine
IRPCOUNT usage.

A-13

Supplemental SYSGEN Information
A.2 Parameter Descriptions

IRPCOUNTV (G)
IRPCOUNTV establishes the upper limit to which IRPCOUNT can be
automatically increased by the system.
If this parameter is set too low, system performance can be adversely affected
because IRPCOUNTV cannot be used for nonpaged pool requests.

There is a penalty of 1 percent of physical memory for any unused growth
space (1 longword for every 3 unused intermediate request packets).
LAMAPREGS (G)
LAMAPREGS sets the number of UNIBUS map registers allocated to an
LPAl 1 driver when the driver is loaded, and limits the registers for the driver
to that number. A value of 0 permits dynamic allocation of an unlimited
number of registers.
LGLBRK_DISUSER (D)
LGl_BRK_DISUSER turns on the DISUSER flag in the UAF record when an
attempted break-in is detected, thus permanently locking out that account.
The parameter is off by default. You should set the parameter only under
extreme security watch conditions, since it results in severely restricted user
service.
LGLBRK_LIM (D)
LGl_BRK_LIM specifies the number of failures that can occur at login time ,
before the system will take action against a possible break-in. The count of
failures applies independently to login attempts by each user name, terminal,
and node. Whenever login attempts from any of these sources reach the
break-in limit specified by LGl_BRK_LIM, the system assumes it is under
attack and will initiate evasive action as specified by the LGL.HID_TIM
parameter.

The default value is usually adequate.
LGLBRK_TERM (D)
LGl_BRK_TERM causes the terminal name to be part of the association
string for the terminal mode of break-in detection. When off, association is
done on user name only. LGl_BRK_TERM is set by default. It should be
cleared if physical terminal names are created dynamically (that is, if LAT is
installed) and effective break-in detection is desired.
LGLBRK_TMO (D)
LGl_BRK_TMO specifies the number of seconds that a user, terminal, or
node is permitted to attempt a login before the system assumes that a breakin attempt is occurring and takes evasive action. Note that LGl_BRK_LIM
may be exceeded before the LGl_BRK_TMO timeout and vice versa. The
evasive action is specified by the LGI.JUD_TIM parameter.
LGLHID_TIM (D)
LGI_HID_TIM specifies the number of seconds that evasive action will
persist following the detection of a possible break-in attempt. The system
refuses to allow any logins during this period, even if a valid user name and
password are specified.

A-14

Supplemental SYSGEN Information
A.2 Parameter Descriptions

LGLRETRV_LIM (D)
LGI_RETRY_LIM specifies the number of retry attempts allowed for users
attempting to log in over dialup lines. If this parameter is greater than 0, and
a legitimate user fails to log in correctly because of typing errors, the user will
not automatically lose the carrier. Instead (provided that LGI_RETRY_TMO
has not elapsed), by pressing the RETURN key, the user is prompted to enter
the user name and password again. Once the specified number of attempts
has been made without success, the user loses the carrier. As long as neither
LGI_BRK_LIM nor LGI_BRK_TMO has elapsed, the user can dial in again
and reattempt login.
LGLRETRV_TMO (D)
LGI_RETRY_TMO specifies the number of seconds allowed between login
retry attempts after each login failure. (Users can initiate login retries by
pressing the RETURN key.) This parameter is intended for use in conjunction
with the LGI_RETRY_LIM parameter and gives dialup users a reasonable
amount of time and number of opportunities to attempt logins before they
lose the carrier.
LGLPWD_TMO (D)
LGI_PWD_TMO specifies, in seconds, the period of time a user has to enter
the correct system password (if used).
LNMPHASHTBL (G)
LNMPHASHTBL sets the size of the process logical name hash table. Logical
names are hashed using a function of the name length and contents. The
LNMPHASHTBL parameter determines the number of entries for processprivate logical names. The recommended setting is the average number of
process-private logical names. Note that the hashed values are rounded up to
the nearest power of 2.
LNMSHASHTBL (G)
LNMSHASHTBL sets the size of the system logical name hash table. Logical
names are hashed using a function of the name length and contents. The
LNMSHASHTBL parameter determines the number of entries for shareable
logical names. These names include all names from the system, group, and
job logical name tables. The recommended setting allows for one to four
logical names per hash table entry. The default setting is usually adequate,
unless your installation has a large number of groups, or many jobs are active
simultaneously. In that case, an increase in the value of the next higher
power of 2 might improve logical name translation performance. Note that
the hashed values are rounded up to the nearest power of 2.
LOCKDIRWT
LOCKDIRWT determines the portion of lock manager directory that will be
handled by this system. The default value is usually adequate.
LOCKIDTBL (M)
LOCKIDTBL sets initial number of entries in the system Lock ID table and
defines the amount by which the Lock ID table is extended whenever the
system runs out of locks. There must be one entry for each lock in the
system; each entry requires four bytes.

A-15

Supplemental SYSGEN Information
A.2 Parameter Descriptions

For simple timesharing systems, the default value is adequate. If your
application uses many locks, as in the case of heavy VMS RMS file
sharing or a database management application, you should increase this
parameter. When you change the value of LOCKIDTBL, examine the value of
RESHASHTBL and change it if necessary.
(The VMS Lock Management Facility is described in the VMS System Services
Reference Manual). You can monitor locks with the MONITOR LOCK
command of the Monitor Utility.
LOCKIDTBL_MAX (D,G,M)
LOCKIDTBL _MAX establishes the maximum size of the Lock ID table.

If you set this parameter value too low, programs receive the following error
message:
%SYSTEM-E-NOLOCKID, no lock id. available

LONGWAIT (D,G,M)
LONGWAIT defines how much real time (in seconds) must elapse before the
swapper considers a process to be temporarily idle. This parameter is applied
to local event flag (LEF) and hibernate (HIB) waits to detect such conditions
as an inactive terminal or ACP.
LRPCOUNT
LRPCOUNT sets the number of preallocated large request packets. Each
packet requires an amount of permanently resident memory that is equal
to the number of bytes specified by the LRPSIZE parameter. (Normally
LRPSIZE is 576 bytes.) If LRPCOUNT is too large, physical memory
is wasted. If LRPCOUNT is too small, the system increases its value
automatically, as needed, to permit the system to perform properly. However,
the system cannot increase LRPCOUNT beyond the value of LRPCOUNTV. If
LRPCOUNT is underconfigured, the penalty is 4 percent of physical memory
from the configured value to the actual value on the running system.

You can use the DCL command SHOW MEMORY/POOL/FULL to determine
LRPCOUNT usage.
LRPCOUNTV (G,M)
LRPCOUNTV establishes the upper limit to which LRPCOUNT can be
automatically increased by the system. If this parameter is set too low,
system performance can be adversely affected by preventing the system from
using this memory allocation mechanism for nonpaged pool requests. There
is a penalty of 1 percent of physical memory for any unused growth space
(approximately one longword for every unused large request packet, if the
default size is used).
LRPSIZE (G,M)
LRPSIZE is the size (in bytes) of the large request packets. The actual physical
memory consumed by a large request packet is LRPSIZE plus overhead for
buffer management.

Normally the default value is adequate. However, for performance reasons,
this parameter should be the same as the DECnet NCP parameter BUFFER
SIZE in the executor database.

A-16

Supplemental SYSGEN Information
A.2 Parameter Descriptions

MAXBUF (D)
MAXBUF sets the maximum size of a buffered 1/0 transfer (card readers,
console floppy diskettes, line printers, mailboxes, and terminals). The space
for a buffered 1/0 operation is allocated from the permanently resident
nonpaged dynamic pool. Note that, for header information, the system adds
from 16 to 64 bytes (depending on the device driver and the nature of the
1/0) to a buffer at allocation time for header information. Therefore, the
largest possible size transfer is reduced by this amount.
MAXPROCESSCNT (G,M)
MAXPROCESSCNT sets the number of process entry slots allocated at
bootstrap time. One slot is required for each concurrent process on the
system. Each slot requires 6 bytes of permanently resident memory.

The default value is normally generously configured to allow you to create
the desired number of processes. If the following message appears, you will
have to increase the value of MAXPROCESSCNT:
%SYSTEM-F-NOSLOT,

No PCB to create process

MAXQUEPRI (D)
MAXQUEPRI determines the highest scheduling priority that can be assigned
to jobs entered in batch and output (printer, server, and terminal) queues
without the submitter process having OPER or ALTPRI privilege. The value
of this parameter can range from 0 to 255; the default is 100. The value of
MAXQUEPRI should be greater than or equal to DEFQUEPRI.

Note: MAXQUEPRI refers to relative queue scheduling priority, not the
execution priority of the job.
MAXSYSGROUP (D)
MAXSYSGROUP sets the highest value that a group number can have and
still be classified as a system UIC group number. Note that the specification
is not in octal unless preceded by the %0 radix indicator. This parameter is
normally left at 8 (10 octal).
MINWSCNT
MINWSCNT sets the minimum number of fluid pages (pages not locked in
the working set) required for the execution of a process. This value added to
the size of the process header establishes the minimum working set size.

The value of MINWSCNT must provide sufficient space to execute any VAX
instruction. Theoretically, the longest instruction requires 52 pages; however,
all VMS code can run with 20 fluid pages. An insufficient value may inhibit
system performance or even put a process into an infinite loop on some
instructions.
MOUNTMSG (D)
MOUNTMSG controls whether or not the messages that log volume mounts
appear on the operator's terminal and in the operator's log. The default value
of 0 disables the reporting of these messages. This parameter does not control
the messages generated by mount assistance requests.
MPW_HILIMIT (G)
MPW_HILIMIT sets an upper limit for the modified page list. When the list
accumulates the number of pages specified by this limit, writing of the list
begins. The pages that are written are then transferred to the free page list.

A-17

Supplemental SYSGEN Information
A.2 Parameter Descriptions

If MPW_HILIMIT is too low, excessive page faulting can occur from the
page file. If it is too high, too many physical pages can be consumed by the
modified page list.
If you increase MPW_HILIMIT, you might also need to increase
MPW_WAITLIMIT. Note that if MPW_WAITLIMIT is less than
MPW_HILIMIT, a system deadlock will occur. The values for the two
parameters are normally equal.

MPW_IQLIMIT
MPW_IOLIMIT specifies the number of outstanding I/Os to the modified
page writer. Prior to VMS Version 5.0, the modified page writer never had
more than one I/O outstanding. For VMS V5.0, the modified page writer can
have up to 127 I/Os outstanding. The default is 4.
Each I/O requires a permanent, non-paged pool allocation (in bytes) equal to
the following formula:
I/ Orequestpacketlength + (6 * M PW _W RTC LU STER)

With the default MPW_WRTCLUSTER of 96, for example, you must allocate
772 bytes for each I/O.

MPW_LQLIMIT (G)
MPW_LOLIMIT sets a lower limit for the modified page list. When writing of
the list causes the number of pages on the list to drop to or below this limit,
writing stops.
MPW_LOLIMIT ensures that a certain number of pages are available on the
modified page list for page faults. If the number is too small, the caching
effectiveness of the modified page list is reduced. If it is too high, less
memory is available for processes, so that swap (and page) may increase.

MPW_LQWAITLIMIT (D)
MPW_LOWAITLIMIT specifies the threshold at which processes in the
miscellaneous wait state MPWBUSY are allowed to resume. Prior to VMS
Version 5.0, processes were not removed from the MPWBUSY wait state until
the size of the modified page list was reduced to MPW_LOLIMIT.
MPW_LOWAITLIMIT increases system performance for fast processors with
large memories by reducing the amount of time processes spend in the
MPWBUSY wait state.
MPW_THRESH (D)
MPW_THRESH sets a lower bound of pages that must exist on the modified
page list before the swapper .writes this list to acquire free pages. If this
requirement is met, the swapper tries to write the modified page list rather
than taking pages away from or swapping out a process.
MPW_WAITLIMIT (D)
MPW_WAITLIMIT sets the number of pages on the modified page list that
will cause a process to wait until the next time the modified page writer
writes the modified list. This parameter limits the rate at which any single
process can produce modified pages. If this value is less than MPW_HILIMIT,
a system deadlock occurs. The value for this parameter is normally equal to
MPW_HILIMIT.

A-18

Supplemental SYSGEN Information
A.2 Parameter Descriptions

MPW_WRTCLUSTER (G)
MPW_WRTCLUSTER sets the number of pages to be written during one 1/0
operation from the modified page list to the page file or a section file. The
actual size of the cluster may be limited by the number of pages available
for the 1/0 operation. This parameter can range in value from 16 to 120,
in multiples of 8. Each page in the cluster requires 6 bytes of permanently
resident memory.

If MPW_WRTCLUSTER is too small, it takes many 1/0 operations to empty
the modified page list. If MPW_WRTCLUSTER is too large for the speed of
the disk that holds the page file, other 1/0 operations are held up for the
modified page list write.
MSCP_BUFFER
MSCP_BUFFER specifies the number of pages to be allocated to the MSCP
server's local buffer area. This buffer area is the space used by the server to
transfer data between client systems and local disks.
MSCP_CREDITS
MSCP_CREDITS specifies the number of outstanding 1/0 requests that can
be active from one client system.
MSCP_LOAD

MSCP_LOAD controls the loading of the MSCP server during a system boot.
Specify one of the following values:
Value

Meaning

Do not load the MSCP server. This is the default value.
Load the MSCP server and serve disks as specified by the
MSCP_SERVE_ALL parameter.

MSCP_SERVE__ALL
MSCP_SERVE__ALL controls the serving of disks during a system boot.
Specify one of the following values:
Value

Meaning

Do not serve any disks. This is the default.

Serve all available disks.

Serve only locally-attached (non-HSC) disks.

If the MSCP_LOAD system parameter is zero, MSCP_SERVE__ALL is
ignored.
MULTIPROCESSING
MULTIPROCESSING controls loading of the system synchronization image.
Specify one of the following values:

A-19

Supplemental SYSGEN Information
A.2 Parameter Descriptions

Value

Meaning

Load uniprocessing synchronization image
Load full-checking multiprocessing synchronization image if CPU type
is capable of SMP and two or more CPUs are present on the system.

Always load full-checking multiprocessing synchronization image,
regardless of system configuration or CPU availability

Load streamlined multiprocessing image if CPU type is capable of SMP
and two or more CPUs are present on the system.

The default value is 1.
MVTIMEOUT (D)
MVTIMEOUT is the time in seconds that a mount verification attempt
continues on a given disk volume. If the mount verification does not recover
the volume within that time, the 1/0 operations outstanding to the volume
terminate abnormally.
NISCS_CQNV_BQOT
NISCS_CONV_BOOT controls whether or not a conversational boot is
permitted during a remote system boot. The default of 0 specifies that
conversational boots are not permitted.
NISCS_LQAD_PEAO
NISCS_LOAD_PEAO controls whether or not the NI-SCS port driver
PEDRIVER is loaded during system boot. The default of 0 specifies that
the PEDRIVER is not loaded.
NISCS_PQRT_SERV
NISCS_PORT_SERV provides flag bits for PEDRIVER port services. Bits 0
and 1 set (decimal value 3) enables data checking. The remaining bits are
reserved for future use.
NJOBLIM (D)
NJOBLIM establishes the limit for network jobs. The maximum number of
jobs is 1024. The minimum is 0, and the default is 16.
NPAGEDYN (G,M)
NPAGEDYN sets the size of the nonpaged dynamic pool in bytes. This figure
is rounded down to an integral number of pages. NP AGEDYN establishes the
initial setting of the nonpaged pool size, but the pool size can be increased
dynamically.

To set a value for this parameter, use the default value initially, and then
monitor the amount of space actually used with the DCL command SHOW
MEMORY /POOL/FULL.
There is a minor physical memory penalty for allowing this growth. If
NP AGEDYN is underconfigured, the penalty is 4 percent of physical memory
from the configured value to the actual value on the running system. You can
decrease the value if too much space is unused and increase it if little space is
unused.

A-20

Supplemental SVSGEN Information
A.2 Parameter Descriptions

NPAGEVIR (G)
NP AGEVIR defines the maximum size to which NP AGEDYN can be
increased. If this value is too small, the system could hang. If NP AGEVIR is
too large, there is a penalty of 1 percent of physical memory for any unused
growth space (1 longword for each 512 bytes of difference between the
system's actual usage of nonpaged pool and the value of NPAGEVIR).
PAGEDYN (G,M)
P AGEDYN sets the size of the paged dynamic pool in bytes. The specified
value is rounded down to an integral number of pages. Each 512 bytes of
paged dynamic pool adds 4 bytes of permanently resident memory to the
system page table; the paged dynamic pool has no other direct memory
requirements.

The paged dynamic pool is used to allocate storage for shared logical names,
resident image headers, known file list entries, and VMS RMS file-sharing
structures. Substantial amounts of space for the pool can be overallocated
with little effect on system performance.
The size of the paged pool can grow dynamically up to the maximum size
that this parameter specifies.
PAGFILCNT (G)
P AGFILCNT defines the maximum number of page files that can be installed.
PAMAXPORT (D)
PAMAXPORT specifies the maximum port number that the CI port driver
polls to discover newly initialized ports or failed remote ports.

You can decrease this parameter to reduce polling activity if the hardware
configuration has fewer than 16 ports. For example, if the configuration
has a total of 5 ports assigned to port numbers 0 through 4, you could set
PAMAXPORT to 4.
If no CI device is configured on your system, this parameter is ignored.
PANOPOLL (D)
PANOPOLL suppresses CI polling for ports. If PANOPOLL is set to 1, a
VAXcluster member node does not discover that another member node has
shut down or powered down quickly or that a new member node has booted.
This parameter is useful if you want to bring up a system that is isolated
from the rest of the VAXcluster for checkout purposes. Setting PANOPOLL is
equivalent to uncabling the system from the star coupler. The default value
of 0 (off) is the normal setting and is required if you are booting from an HSC
or if your system is joining a VAXcluster.
If no CI device is configured on your system, this parameter is ignored.
PANUMPOLL (D)
Establishes the number of ports to poll each polling interval. The normal
setting for PANUMPOLL is 16. The parameter is useful in applications
sensitive to the amount of contiguous time that VMS spends at IPL 8.
Reducing PANUMPOLL reduces the amount of time spent at IPL 8 during
each polling interval, while increasing the number of polls needed to discover
new or failed ports.
If no CI device is configured on your system, this parameter is ignored.

A-21

Supplemental SYSGEN Information
A.2 Parameter Descriptions

PAPOLLINTERVAL (D)
PAPOLLINTERVAL specifies in seconds the polling interval the CI port driver
uses to poll for a newly booted system, a broken port-to-port virtual circuit,
or a failed remote port.

This parameter trades faster response to virtual circuit failures against
increased polling overhead. DIGITAL recommends that you use the default
value for this parameter.
If no CI device is configured on your system, this parameter is ignored.
PAPOOLINTERVAL (D)
PAPOOLINTERVAL is the interval in seconds after which a CI or UDA port
driver's suspended request for message buffer allocation from nonpaged
pool is awakened to repeat the request. A request is suspended if there is
insufficent nonpaged pool.
If no CI device or UDA 50/52 is configured on your system, this parameter is

ignored.
The default value should always be adequate.
PASANITY (D)
PASANITY controls whether the port sanity timer is enabled to permit
remote systems to detect a system that has been hung at IPL 8 or above
for 100 seconds. This parameter is normally set to 1 and should be set to 0
only when you are debugging with XDELTA or planning to halt the CPU for
periods of 100 seconds or more.

PASANITY is only semi-dynamic. A new value of PASANITY takes effect on
the next CI port reinitialization.
If no CI device is configured on your system, this parameter is ignored.
PASTDGBUF

PASTDGBUF is the number of datagram receive buffers to queue initially for
the CI port driver's configuration poller; the initial value is expanded during
system operation, if needed.
If no CI device is configured on your system, this parameter is ignored.
PASTIMOUT (D)
PASTIMOUT is the basic interval at which the CI port driver wakes up to
perform time-based bookkeeping operations. It is also the period after which
a start handshake datagram is assumed to have timed out.
If no CI device is configured on your system, this parameter is ignored.

The default value should always be adequate.
PFCDEFAULT (D)
During execution of programs, PFCDEFAULT controls the number of image
pages read from disk per I/O operation when a page fault occurs. The read
I/O operations can take place from an image file or from the page file. The
actual size of the cluster can be less than PFCDEFAULT, depending on the
size of image sections and the pattern of page references.

A-22

Supplemental SYSGEN Information
A.2 Parameter Descriptions

The value of this parameter should not be less than 16 to ensure adequate
1/0 performance. The value should not be greater than one-fourth the default
size of the average working set to prevent a single page fault from displacing
a major portion of a working set. Too large a value for PFCDEFAULT
can hurt system performance. PFCDEFAULT can be overridden on an
image-by-image basis with the CLUSTER option of the VMS Linker.
PFRATH (0,M)
PFRATH specifies the page fault rate above which the limit of a working set
will be automatically increased. The unit of measure is the number of faults
per 10 seconds of processor time. At a setting of 120, for example, the system
will automatically increase the limit of a working set if it is faulting more than
120 pages per 10 seconds.

Decreasing the value of this parameter tends to increase the limits of the
working sets, while increasing its value tends to decrease their limits.
PFRATL (0,M)
PFRATL specifies the page fault rate below which the limit of a working
set is automatically decreased. The unit of measure is the number of faults
per 10 seconds of processor time. At a setting of 1, for example, the system
automatically decreases the limit of a working set if it is faulting less than 1
page every 10 seconds.

Increasing the value of this parameter tends to decrease the limits of the
working sets, while decreasing its value tends to increase their limits.
PQL_OASTLM (0,G)
PQL-DASTLM sets the default limit on the number of pending ASTs for a
process created by the Create Process ($CREPRC) system service or the DCL
command RUN (Process).
PQL_OBIOLM (0,G)
PQL _DBIOLM sets the default buffered 1/0 count limit for the number
of outstanding buffered 1/0 operations permitted to a process created by
the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_OBYTLM (0,G)
PQL_DBYTLM sets the default buffered 1/0 byte count limit for the amount
of buffered space available to a process created by the Create Process
($CREPRC) system service or the DCL command RUN (Process).
PQL_OCPULM (0,G)
PQL-DCPULM sets the default CPU time limit for a process created by
the Create Process ($CREPRC) system service or the DCL command RUN
(Process). PQL_DCPULM specifies the time limit in increments of 10
milliseconds.

The default value of 0 imposes no limit on CPU time usage and is typically
the correct value for this parameter.
PQL_OOIOLM (0,G)
PQL_DDIOLM sets the default direct 1/0 limit for a process created by
the Create Process ($CREPRC) system service or the DCL command RUN
(Process).

A-23

Supplemental SYSGEN Information
A.2 Parameter Descriptions

PQL_DENQLM (D,G}
PQL _DENQLM sets the default enqueue limit for a process created by
the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_DFILLM (D,G}
PQL _DFILLM sets the default open file limit for a process created by the
Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_DPGFLQUOTA (D,G}
PQL _DPGFLQUOTA sets the default page file quota for a process created
by the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_DJTQUOTA (D}
PQL _DJTQUOTA sets the default job table byte count quota for a process
created by the Create Process ($CREPRC) system service or the DCL
command RUN (Process). PQL_DJTQUOTA specifies the number of bytes of
paged pool allocated to the job table. The default value is usually adequate,
unless a large number of job logical names or temporary mailboxes are used.
PQL_MJTQUOTA (D}
PQL _MJTQUOTA sets the minimum job table byte count quota for a
process created by the Create Process ($CREPRC) system service or the
DCL command RUN (Process).
PQL_DPRCLM (D,G}
PQL_DPRCLM sets the default subprocess limit for a process created by
the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_DTQELM (D,G}
PQL _DTQELM sets the default number of timer queue entries for a process
created by the Create Process ($CREPRC) system service or the DCL
command RUN (Process).
PQL_DWSDEFAULT (G}
PQL_DWSDEFAULT sets the default working set size for a process created
by the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_DWSEXTENT (D,G}
PQL_DWSEXTENT sets the default working set extent for a process created
by the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_DWSQUOTA (D,G}
PQL _DWSQUOTA sets the default working set quota for a process created
by the Create Process ($CREPRC) system service or the DCL command RUN
(Process).

A-24

Supplemental SYSGEN Information
A.2 Parameter Descriptions

PQL_MASTLM (D,G)
PQL_MASTLM sets a default limit on the minimum number of pending
ASTs for a process created by the Create Process ($CREPRC) system service
or the DCL command RUN (Process).
PQL_MBIOLM (D,G)
PQL_MBIOLM sets the minimum buffered I/O limit for a process created
by the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_MBVTLM (D,G)
PQL_MBYTLM sets the minimum buffered I/O byte limit for a process
created by the Create Process ($CREPRC) system service or the DCL
command RUN (Process).
PQL_MCPULM (D,G)
PQL_MCPULM sets the minimum CPU time limit in increments of 10
milliseconds for a process created by the Create Process ($CREPRC) system
service or the DCL command RUN (Process).
PQL_MDIOLM (D,G)
PQL_MDIOLM sets the minimum direct I/O limit for a process created by
the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_MENQLM (D,G)
PQL_MENQLM sets the default limit on the minimum number of locks
that can be queued at one time by a process created by the Create Process
($CREPRC) system service or the DCL command RUN (Process).
PQL_MFILLM (D,G)
PQL _MFILLM sets the minimum open file limit for a process created by
the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_MPGFLQUOTA (D,G)
PQL _MPGFLQUOTA sets the minimum page file quota for a process created
by the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_MPRCLM (D,G)
PQL _MPRCLM sets the minimum subprocess limit for a process created by
the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PQL_MTQELM (D,G)
PQL _MTQELM sets the minimum number of timer queue entries for a
process created by the Create Process ($CREPRC) system service or the DCL
command RUN (Process).
PQL_MWSDEFAULT (G)
PQL_MWSDEFAULT sets the minimum default working set size for a
process created by the Create Process ($CREPRC) system service or the DCL
command RUN (Process).

A-25

Supplemental SYSGEN Information
A.2 Parameter Descriptions

PQL_MWSEXTENT (D,G)
PQL _MWSEXTENT sets the minimum working set extent for a process
created by the Create Process ($CREPRC) system service or the DCL
command RUN (Process).
PQL_MWSQUOTA (D,G)
PQL _MWSQUOTA sets the minimum working set quota for a process created
by the Create Process ($CREPRC) system service or the DCL command RUN
(Process).
PRC POLI NTERVAL (D)
PRCPOLINTERVAL specifies, in seconds, the polling interval used to look for
Systems Communications Services (SCS) applications, such as the Connection
Manager and Mass Storage Control Protocol (MSCP) disks, on other nodes.
All discovered nodes are polled during each interval.

This parameter trades polling overhead against quick recognition of new
systems or servers as they appear.
PROCSECTCNT (G)
PROCSECTCNT sets the number of section descriptors that a process can
contain. Each section descriptor increases the fixed portion of the process
header by 32 bytes.

You should set a value greater than the maximum number of image sections
in any section to be run, as indicated by the linkage memory allocation map
for the image.
QDSKINTERVAL
QDSKINTERVAL establishes, in seconds, the disk quorum polling interval.
QDSKVOTES
QDSKVOTES specifies the number of votes contributed by a quorum disk in
a VAXcluster.
QUANTUM (D,M)
QUANTUM defines the following:

•

Processor time-maximum amount of processor time a process can
receive before control passes to another process of equal priority that is
ready to compute

•

Balance set residency-minimum amount of service a compute-state
process must receive before being swapped out to secondary storage

QUORUM
This parameter is obsolete with VMS Version 5.0. VMS automatically
calculates cluster quorum from the value of the EXPECTED_VOTES
parameter. See the description of the EXPECTED_VOTES parameter for
more information.
REALTIME_SPTS (D,G,M)
REALTIME_SPTS reserves a number of system page table entries for
mapping connect-to-interrupt processes into system space. This value should
normally remain at the default ( 0) in an environment that is not real-time.
Where connect-to-interrupt processes do use the system, this value should

A-26

Supplemental SYSGEN Information
A.2 Parameter Descriptions

represent the maximum number of pages that all concurrent connect-tointerrupt processes must map into system space. See the VMS Run-Time
Library Routines Volume for details.
RECNXINTERVAL (D)
RECNXINTERVAL establishes the polling interval, in seconds, during which
to attempt reconnection to a remote system.
RESHASHTBL (M)
RESHASHTBL defines the number of entries in the lock management resource
name hash table. Each entry requires 4 bytes. As a general guideline, there
should be 1 resource hash table entry for every 4 locks in the system. Thus,
RESHASHTBL should be one-quarter the value of LOCKIDTBL, rounded up
to the closest power of 2.
RJOBLIM (D)
RJOBLIM defines the maximum number of remote terminals allowed in the
system at any one time.
RMS_DfMBC (D)
RMS_DFMBC specifies the default disk block size used by RMS in accessing
sequential files.
RMS_DfMBFHSH (D)
RMS_DFMBFHSH establishes the hashed multibuffer count.
RMS_DfMBFIDX (D)
RMS_DFMBFIDX establishes the default VMS RMS multibuffer count for
indexed sequential disk operations. This value defines the number of 1/0
buffers that VMS RMS allocates for each indexed file. For sequential access,
a larger number that allows some of the index buckets to remain in memory
can improve performance.
RMS_DfMBFREL (D)
RMS_DFMBFREL establishes the default VMS RMS multibuffer count for
relative disk operations. This value defines the number of 1/0 buffers that
VMS RMS allocates for each relative file.
RMS_DfMBFSDK (D)
RMS_DFMBFSDK establishes the default VMS RMS multibuffer count for
sequential disk operations. This value defines the number of 1/0 buffers that
VMS RMS allocates for sequential disk files.

Normally the default value is adequate. However, if read/ahead or write/
behind operations are used, a larger number will improve performance.
RMS_DfMBFSMT (D)
RMS_DFMBFSMT establishes the default VMS RMS multibuffer count for
magnetic tape operations. This value defines the number of 1/0 buffers that
VMS RMS allocates for magnetic tape files.
RMS_DfMBFSUR (D)
RMS_DFMBFSUR establishes the default multibuffer count for unit record
devices.

A-27

Supplemental SYSGEN Information
A.2 Parameter Descriptions

RMS_DfNBC (D)
RMS_DFNBC specifies a default block count for network access to remote,
sequential, indexed sequential, and relative files.
The network block count value represents the number of blocks that RMS
is prepared to allocate for the 1/0 buffers used to transmit and receive
data. The buffer size used for remote file access, however, is the result of a
negotiation between VMS RMS and the remote File Access Listener (FAL).
The buffer size chos is the smaller of the two sizes presented.
Thus, RMS_DFNBC places an upper limit on the network buffer size that
is used. It also places an upper limit on the largest record that can be
transferred to or from a remote file. In other words, the largest record that
can be transferred must be less than or equal to RMS_DFNBC multiplied by
512 bytes.

RMS_EXTEND_SIZE (D)
RMS_EXTEND_SIZE specifies the number of blocks by which files are
extended as they are written. This number should be chosen to balance
the amount of extra disk space wasted at the ends of each file against the
performance improvement provided by making large extents infrequently.
When small disk quotas are used, a small number such as the disk cluster size
should be specified to prevent the user's disk quota from being consumed. If
the value of 0 is used, VMS RMS will allocate large extents and truncate the
file back to its actual usage when it closes.
RMS_flLEPROT
RMSJILEPROT determines the default file protection for system processes
such as those that create the error log, operator log, and job controller. It also
determines default file protection for processes created by the job controller
(all interactive and batch processes).
Since a process always inherits its default file protection from its creator
process, RMS_FILEPROT determines default file protection only for users
who do not execute the DCL command SET PROTECTION/DEFAULT in
their login command procedure or during an interactive session.
The protection is expressed as a mask (see the discussion of the $CRMPSC
system service in the VMS System Services Reference Manual for more
information on specifying protection masks). By default, the mask is 64000
(decimal) or FAOO (hexadecimal), which represents the following protection:
(S:RWED,O:RWED,G:RE,W:)

RMS_GBLBUFQUO (D)
RMS_GBLBUFQUO specifies the number of global buffers that can be
allocated on the system at any one time.
RMS_PROLOGUE (D)
RMS_PROLOGUE specifies the default prologue VMS RMS uses to create
indexed files. The default value 0 specifies that VMS RMS should determine
the prologue based on characteristics of the file. 2 specifies Prologue 2
or Prologue 1, and 3 specifies Prologue 3. The VMS RMS prologues are
described in the VMS Record Management Services Manual.

A-28

Supplemental SYSGEN Information
A.2 Parameter Descriptions

SAVEDUMP
SAVEDUMP specifies whether, if the dump file is saved in the page file, the
page file should be saved until the dump file is analyzed. The default value
0 specifies that the page file should not be saved. A value of 1 specifies that
the file should be saved.
SCSBUFFCNT (G)
SCSBUFFCNT is the number of CI buffer descriptors configured for all CI
ports on the system. If no CI device is configured on your system, this
parameter is ignored.
SCSCONNCNT (G)
SCSCONNCNT is the initial number of SCS connections that are configured
for use by all system applications, including the one used by Directory Service
Listen. The initial number will be expanded by the system if needed.
If no CI device or UDA 50/52 is configured on your system, this parameter is
ignored.

The default value is adequate for all CI/UDA hardware combinations
available with VMS Version 5.0.
SCSFLOWCUSH (D)
SCSFLOWCUSH is an SCS flow control parameter for sequenced messages.
For each connection, SCS tracks the number of receive buffers available
and communicates the number to the SCS at the remote end of the
connection. However, SCS does not need to do this for each new receive
buffer. Instead, SCS notifies the remote SCS of new receive buffers if the
number already communicated to the remote SCS falls as low as the value of
SCSFLOWCUSH.
If no CI device is configured on your system, this parameter is ignored.

SCSMAXDG (G)
SCSMAXDG is the maximum number of bytes of application data in one
datagram. The amount of physical memory consumed by one datagram
packet is SCSMAXDG plus overhead for buffer management.

DECnet is a primary user of SCS datagrams. For performance reasons,
SCSMAXDG should be set to the same value (up to a maximum of 985) as
the DECnet NCP parameter BUFFER SIZE in the executor database. (Note
the the maximum value for NCP parameter BUFFER SIZE is greater than the
maximum value for SCSMAXDG.)
If no CI device is configured on your system, this parameter is ignored.

SCSMAXMSG (G)
SCSMAXMSG is the maximum number of bytes of application data in one
message.
If no CI device is configured on your system, this parameter is ignored.

Do not change the default value.
SCSNODE (G)
SCSNODE is the SCS system name. It should be the same as the DECnet
node name (limited to six characters), since the name must be unique among
all systems in the VAXcluster. Specify the parameter value as an ASCII string

A-29

Supplemental SYSGEN Information
A.2 Parameter Descriptions

enclosed in parentheses. Note that the string may not include dollar sign ($)
or underscore (-) characters.
SCSRESPCNT (G)
SCSRESPCNT is the total number of response descriptor table entries
(RDTEs) configured for use by all system applications.
If no CI device or UDA 50/52 is configured on your system, this parameter is
ignored.

SCSSYSTEMID (G)
SCSSYSTEMID specifies the lower-order 32 bits of the 48-bit system
identification number. It is the unique identifier of each system and is
calculated as follows:
(DECnet area number * 1024) + DECnet-VAX node number.

For example, if the DECnet address is 2.211, then SCSSYSTEMID should be
set to (2 * 1024) + 211.
SCSSYSTEMIDH (G)
SCSSYSTEMIDH specifies the high-order 16 bits of the 48-bit system
identification number and must be set to 0.
SETTIME
SETTIME enables or disables solicitation of the time of day each time the
system is booted. This parameter should usually be off (0), so that the system
sets the time of day at boot time to the value of the processor time-of-day
register. You can reset the time after the system is up with the DCL command
SET TIME (see the VMS DCL Dictionary).
SHADOWING
SHADOWING is a Boolean value specifying the type of disk class driver
that is loaded on the system. The default value of 0 loads the normal disk
class driver, DUDRIVER. A value of 1 loads the shadowing disk class driver,
DSDRIVER.
SMP_CPUS
SMP_CPUS identifies which secondary processors, if available, are to be
booted into the multiprocessing system at boot time. SMP_CPUS is a 32bit mask; if the value of a bit in the mask is l, the processor with the
corresponding CPU ID is booted into the multiprocessing system (if it is
available). For example, if you want to boot only the CPUs with CPU IDs 0
and l, specify the value 3 (both bits are on).

The default value of SMP_CPUS, -1, boots all available CPUs into the
multiprocessing system.
Note that, although a bit in the mask corresponds to the primary processor's
CPU ID, the primary processor is always booted. That is, if the mask is set to
zero, the primary CPU will still boot. Any available secondary processors will
not be booted into the multiprocessing system.
This parameter is ignored if the MULTIPROCESSING parameter is set to
zero.

A-30

Supplemental SYSGEN Information
A.2 Parameter Descriptions

SMP_LNGSPINWAIT
Certain shared resources in a multiprocessing system take longer to become
available than allowed for by the SMP_SPINWAIT parameter.
SMP_LNGSPINWAIT establishes, in 10-microsecond intervals, the length of
time a processor in a multiprocessing system waits for these resources.
A timeout causes a CPUSPINWAIT bugcheck.
SMP_SANITY_CNT
SMP_SANITY_CNT establishes, in 10-millisecond clock ticks, the timeout
interval for each CPU in a symmetric multiprocessing (SMP) system. Each
CPU in an SMP system monitors the sanity timer of one other CPU in
the configuration to detect hardware or software failures. If allowed to go
undetected, these failures could cause the cluster to hang.
A timeout causes a CPUSANITY bugcheck.
SMP_SPINWAIT
SMP_SPINWAIT establishes, in 10-microsecond intervals, the amount of time
a CPU in an SMP system normally waits for access to a shared resource. This
process is called spinwaiting.
A timeout causes a CPUSPINWAIT bugcheck.
SPTREQ
SPTREQ sets the number of system page table (SPT) entries required for
mapping the following components:
Executive image
VMS RMS image
SYS MSG .EXE file
Multiport memory structures
Each MASSBUS adapter
Each UNIBUS adapter
Each DR32 adapter
The number of system page table entries required for all other purposes is
automatically computed and added to the value of SPTREQ to yield the actual
size of the system page table.
SRPCOUNT (M)
SRPCOUNT sets the number of preallocated small request packets. Each
packet requires 96 bytes of permanently resident memory. If SRPCOUNT is
too large, physical memory is wasted. If SRPCOUNT is too small, the system
increases its value automatically, as needed, to permit proper performance.
However, the system cannot increase SRPCOUNT beyond the value of
SRPCOUNTV. Furthermore, there is a minor physical memory penalty for
allowing this growth. If SRPCOUNT is underconfigured, the penalty is 4
percent of physical memory from the configured value to the actual value on
the running system.
You can use the DCL command SHOW MEMORY /POOL/FULL to determine
SRPCOUNT usage.
SRPCOUNTV
SRPCOUNTV establishes the upper limit to which SRPCOUNT can be
increased.

A-31

Supplemental SYSGEN Information
A.2 Parameter Descriptions

If this parameter is set too low, system performance can be adversely affected
by preventing the system from using this memory allocation mechanism for
nonpaged pool requests. If SRPCOUNTV is set too high, there is a penalty of
1 percent of physical memory for any unused growth space (1 longword for
every 5 unused small request packets if the default size is used).
STARTUP_P1-8
STARTUP_Pl specifies that a minimum sequence of system startup
procedures be performed. STARTUP_p2 controls whether verification is
set during the execution of a startup procedure. STARTUP_P3-P8 are not yet
implemented.
SWPFILCNT
SWPFILCNT defines the maximum number of swap files that can be installed.
SWPOUTPGCNT (0)
SWPOUTPGCNT defines the minimum number of pages to which the
swapper should attempt to reduce a process before swapping it out. The
pages taken from the process are placed into the page system. This parameter
allows the swapper an alternative mechanism before actually performing
swaps.
SYSMWCNT (G,M)
SYSMWCNT sets the quota for the size of the system working set, which
contains the pageable portions of the system, the paged dynamic pool, VMS
RMS, and the resident portion of the system message file.
While a high value takes space away from user working sets, a low value may
seriously impair system performance. Appropriate values vary depending on
the level of system use. When the system is running at full load, check the
rate of system faults with the MONITOR PAGE command of the Monitor
Utility. An average system page fault rate of between 0 and 3 page faults
per second is desirable. If the system page fault rate is high, and especially if
the system seems to be slow, you should increase the value of SYSMWCNT.
However, do not set this parameter so high that system page faulting never
occurs.
TAPE_MVTIMEOUT (D)
TAPE_MVTIMEOUT is the time in seconds that a mount verification attempt
will continue on a given magnetic tape volume. If the mount verification does
not recover the volume within that time, the 1/0 operations outstanding to
the volume will terminate abnormally.
TIMEPROMPTWAIT
TIMEPROMPTWAIT defines the number of seconds that you want a VAX
processor to wait for the time and date to be entered when a system
boot occurs, if the processor's time-of-year clock does not contain a valid
time. (The time unit of micro-fortnights is approximated as seconds in the
implementation.) If the time specified by TIMEPROMPTWAIT elapses, the
system continues the boot operation, and the date and time are set to the last
recorded time that the system booted. For a VAX-11/730, which does not
have a battery back-up clock, the system time must be supplied following a
power failure.

A-32

Supplemental SYSGEN Information
A. 2 Parameter Descriptions

Note: DIGITAL recommends that you set the system time correctly before
allowing the system to run, so that all functions employing time-stamping
(such as the operator log, the error log, accounting records, file creation
dates, and file expiration dates) will contain correct time values.
Depending upon the value specified for the TIMEPROMPTWAIT parameter,
the system acts in one of the three following ways:
•

If TIMEPROMPTWAIT is 0, no prompt or wait occurs; the system boots
immediately, using the time of the last boot as the system time.

•

If TIMEPROMPTWAIT is a positive number less than 32768, one
prompt is issued and the value dictates how many seconds you can
take to respond with a time. If you do not provide a time before
TIMEPROMPTWAIT elapses, the system boots, using the time of the
last boot as the system time.

•

If TIMEPROMPTWAIT is a number in the range of 32768 through 65535,
the prompt for the time is issued at intervals starting with 2 and doubling
until 256 seconds is reached. If no response is received, the prompts
restart, with the 2-second interval. This prompting process repeats
indefinitely, until you specify a time.

TTY_ALTALARM
TTY_AL TALARM sets the size of the alternate type-ahead buffer alarm. This
value indicates at what point an XOFF should be sent to terminals that use the
alternate type-ahead buffers with the size specified by the TTY_AL TYP AHO
parameter.
TTV_ALTYPAHD
TTY_ALTYP AHO sets the size of the alternate type-ahead buffer. Use this
parameter to allow the block mode terminals and communications lines to
operate more efficiently.
The default value is usually adequate. Do not exceed the maximum value of
32767 when setting this parameter.

TTV_AUTOCHAR
TTY_AUTOCHAR sets the character the terminal driver echoes when the job
controller has been notified.
TTV_BUF
TTY_BUF sets the default line width for terminals.
TTV_CLASSNAME
TTY_CLASSNAME provides the 2-character prefix for the terminal class
driver name that is required when booting. Changing the prefix can be useful
when debugging a new terminal driver.
TTV_DEFCHAR
TTY_DEFCHAR sets the default characteristics for terminals, using a code
derived by summing the following hexadecimal values:

A-33

Supplemental SYSGEN Information
A.2 Parameter Descriptions

Value (HEX)

Characteristic
NOE CHO
NOTYPEAHEAD

ESCAPE

Function

Noecho mode

No type-ahead buffer

Escape sequence processing

HOSTSYNC

Host can send XON/XOFF

TTSYNC

Terminal can send XON/XOFF

LOWERCASE

Lowercase

TAB

100

Mechanical tabs

WRAP

200

Wraparound at end of line

400

Perform carriage return fill

800

Perform line feed fill

SCOPE

1000

Terminal is a scope

EIGHT_BIT

8000

Eight-bit terminal

MBXDSABL

10000

Disable mailbox

NOBROADCAST

20000

Prohibit broadcast

CRFILL
LFFILL

READSYNC

40000

XON/XOFF on reads

FORM

80000

Mechanical form feeds

HALFDUP

100000

Set for half-duplex operation

MODEM

200000

Set for modem signals

1 Do not set this characteristic as the default in TTY_DEFCHAR.

Where a condition is false, the value is 0.
The upper byte is the page length. The default characteristics are 24 lines
per page, terminal synchronization, wraparound, lowercase, scope, and
full-duplex.
TTV_OEFCHAR2
TTY_DEFCHAR2 sets a second longword of default terminal characteristics.
The default characteristics are represented as a code that is derived by
summing the following hexadecimal values:
Characteristic
LOCALE CHO

A-34

Value

Function
Enable local echo terminal logic; use with the
TTY_DEFCHAR NOECHO characteristic

AUTOBAUD

2 Enable autobaud detection

HANGUP

4 Hang up on logout

MODHANGUP

8 Allow modification of HANGUP without privileges

BRDCSTMBX

10 Allow sending of broadcasts to mailboxes

XON

20 (No effect in this parameter)

OMA

40 (No effect in this parameter)

ALTYPEAHD

80 Use the alternate type-ahead parameters

Supplemental SYSGEN Information
A.2 Parameter Descriptions

Characteristic

Value

Function

SETSPEED

100 Clear to allow setting of speed without privileges

EDITING

1000 Line editing allowed

INSERT

2000 Sets default mode for insert

FALLBACK

4000 Do not set this bit with SYSGEN. Refer to
the VMS Terminal Fallback Utility Manual for
information on setting the FALLBACK terminal
characteristic using the Terminal Fallback Utility.

DIALUP

8000 Terminal is a dialup line

SECURE

10000 Guarantees that no process is connected to
terminal after BREAK key is pressed

DISCONNECT

20000 Allows terminal disconnect when a hangup
occurs

PASTHRU

40000 Terminal is in PASTHRU mode

SYSPWD

80000 Login with system password only

SIXEL

100000 Sixel graphics

DRCS

200000 Terminal supports loadable character fonts

PRINTER

400000 Terminal has printer port

APP_KEYPAD

800000 Notifies application programs of state to set
keypad on exit

ANSl_CRT

1000000 Terminal conforms to ANSI CRT programming
standards

REGIS

2000000 Terminal has REGIS CRT capabilities

BLOCK_MODE

4000000 Block mode terminal

ADVANCED_
VIDEO

8000000 Terminal has advanced video

EDIT

10000000 Terminal has local edit capabilities

DE CC RT

20000000 Terminal is a DIGIT AL CRT

DECCRT2

40000000 Terminal is a DIGIT AL CRT Level 2

DECCRT3

80000000 Terminal is a DIGITAL CRT Level 3

The defaults are AUTOBAUD and EDITING.
TTV_DEFPORT
TTY_DEFPORT provides flag bits for port drivers. Bit 0 set to 1 indicates that
the terminal controller does not provide automatic XON /XOFF flow control.
This bit should not be set for DIGITAL controllers but is needed for some
foreign controllers. Currently only the YCDRIVER (DMF32,DMZ32) uses this
bit. The remaining bits are reserved for future use.
TTV_DIALTYPE
TTY_DIALTYPE provides flag bits for dialups. Bit 0 is 1 for United Kingdom
dialups and 0 for all others. Bit 1 controls the modem protocol used. Bit 2
controls whether modem lines will hang up 30 seconds after seeing CARRIER
if a channel is not assigned to the device. The remaining bits are reserved
for future use. See the VMS I/O User's Reference Manual: Part I for more
information on flag bits.

A-35

Supplemental SYSGEN Information
A.2 Parameter Descriptions

TTV_DMASIZE (D)
TTY_DMASIZE specifies the number of characters in the output buffer below
which character transfers are performed, and above which DMA transfers
occur, provided the controller is capable of DMA 1/0.
TTV_OWNER
TTY_OWNER specifies the owner UIC against which terminal protection
is set. The specification must represent the value of a standard 32-bit UIC
with the group number in the high-order word and the member number
in the low-order word. You should usually set TTY_OWNER to a value of
hexadecimal 10004, which is UIC [1,4].
TTV_PARITV
TTY_PARITY sets terminal default parity.
TTV_PROT
TTY_PROT sets the default protection for all terminals in relation to the UIC
specified for the TTY_OWNER parameter. The specification must represent
the value of a standard 16-bit protection mask as described in the VMS DCL
Dictionary. However, only read bits are meaningful. When a read bit is on,
that category of user 1s prohibited from allocating terminals.

The default (FFFO) provides for system access only on terminals. You can
change protection on a per-terminal basis with the DCL command SET
PROTECTION/DEVICE, to permit user allocation of remote and application
terminals.
Note that this protection does not prevent logging in on the terminal; it only
prevents allocation of the terminal by another process.
TTV_RSPEED
TTY_RSPEED defines the receive speed for terminals. If TTY_RSPEED is 0,
TTY_SPEED controls both the transmit and the receive speed. This parameter
is only applicable for controllers that support split-speed operations, such as
the DZ-32 and the DMF-32.
TTV_SCANDELTA
TTY_SCANDELTA sets the interval for polling terminals for dialup and ,
hangup events. Shorter intervals use more processor time; longer intervals
may result in missing a hangup event.
TTV_SILOTIME
TTY_SILOTIME defines the interval at which the DMF-32 hardware. polls
the input silo·for received characters. The DMF-32 asynchronous terminal
controller can delay the generation of a single input interrupt until multiple
characters have accumulated in the input silo. TTY_SILOTIME specifies the
number of milliseconds that the characters are allowed to accumulate prior to
the generation of an input interrupt by the hardware.
TTV_SPEED
TTY_SPEED sets the system-wide default speed for terminals. Low byte is
transmit speed, and high byte is receive speed. If high byte is set to 0, receive
speed is identical to transmit speed. Baud rates are defined by the $TTDEF
macro.

A-36

Supplemental SYSGEN Information
A.2 Parameter Descriptions

TTV_TIMEOUT
TTY_TIMEOUT sets the number of seconds before a process associated with
a disconnected terminal is deleted. The default value (300 seconds) is usually
adequate. Note that using values for TTY_TIMEOUT greater than one year
(value %X01E13380) can cause overflow errors and result in a disconnected
device timing out immediately.
TTV_TVPAHDSZ
TTY_TYPAHDSZ sets the size of the terminal type-ahead buffer. The default
value is usually adequate. Do not exceed the maximum value of 32767 when
setting this parameter.
UAFALTERNATE (D,G,M)
UAFALTERNATE enables or disables the assignment of SYSUAF as the
logical name for SYSUAFALT, causing all references to the user authorization
file (SYSUAF) to be translated to SYS$SYSTEM:SYSUAFALT. Use of the
normal user authorization file (SYS$SYSTEM:SYSUAF) can be restored by
deassigning the system logical name SYSUAF. This parameter should be set
on (1) only when the system is being used by a restricted set of users. You
must create a user authorization file named SYSUAFALT prior to setting
UAFALTERNATE to 1.
UDABURSTRATE (G)
UDABURSTRATE specifies the maximum number of longwords that the
UDASO or LESI controller will transfer on the UNIBUS per DMA transfer.

Note: The UDABURSTRATE parameter is configuration- and workloaddependent. Alteration of the default value can cause serious problems.
Consult your Field Service Representative before changing the default
value of this parameter.
USERD1 (D)
USERDl is a dynamic parameter that is reserved for definition at the user's
site. The reserved longword is referenced by the symbol SGN$GL _USERD1
in the module SYS$SYSTEM:SYS.STB.
USERD2 (D)
USERD2 is a dynamic parameter that is reserved for definition at the user's
site. The reserved longword is referenced by the symbol SGN$GL_USERD2
in the module SYS$SYSTEM:SYS.STB.
USER3
USER3 is a parameter that is reserved for definition at the user's site. The
reserved longword is referenced by the symbol SGN$GL _USER3 in the
module SYS$SYSTEM:SYS.STB.
USER4
USER4 is a parameter that is reserved for definition at the user's site. The
reserved long~ord is referenced by the symbol SGN$GL _USER4.
VAXCLUSTER
VAXCLUSTER controls loading of the cluster code. Specify one of the
following:

A-37

Supplemental SYSGEN Information
A.2 Parameter Descriptions

Value

Meaning

Never load

Load if SCSLOA is being loaded

Always load (and also load SCSLOA)

The default value is 1.
VIRTUALPAGECNT (G,M)
VIRTUALP AGECNT sets the maximum number of virtual pages that can
be mapped for any one process. Every 128 virtual pages require 4 bytes of
permanently resident memory in the system page table (as discussed under
the BALSETCNT parameter). A program is allowed to divide its virtual space
between the PO and Pl tables in any proportion, except that the Pl table
must be large enough to map 320 pages.

When the System Dump Analyzer is used, you must ensure that the value of
VIRTUALPAGECNT is at least the size of the dump file plus approximately
3000 pages.
VOTES
VOTES establishes the number of votes a VAXcluster member system
contributes to a quorum.
WINDQW_SVSTEM
WINDOW_SYSTEM specifies the windowing system to be used on a VAX
workstation. Specify one of the following values:
Value

Meaning

Load the VMS DECwindows workstation environment.

Load the VMS UIS workstation environment. This is the default
windowing system established on VAX workstations.

WSDEC (D,M)
WSDEC specifies the number of pages by which the limit of a working set
is automatically decreased at each adjustment interval (which is quantum
end). At a setting of 35, for example, the system will decrease the limit of a
working set by 35 pages each time a decrease is required.

Increasing the value of this parameter tends to increase the speed with which
working set limits are decreased when the need arises.
WSINC (D,M)
WSINC specifies the number of pages by which the limit of a working set
is automatically increased at each adjustment interval (which is quantum
end). At a setting of 150, for example, the system will increase the limit of a
working set by 150 pages each time an increase is required.

Decreasing the value of this parameter tends to reduce the speed with which
working set limits are increased when the need arises. Normally, you should
keep this parameter at a high value because a rapid increase in limit is often
critical to performance.

A-38

Supplemental SYSGEN Information
A.2 Parameter Descriptions

A value of 0 for WSINC disables the automatic adjustment of working set
limits for all processes. Limits stay at their base values. You can disable the
automatic adjustment of working set limits on a per-process basis by using
the DCL command SET WORKING_SET.
WSMAX (G,M)

WSMAX sets the maximum number of pages on a systemwide basis for any
working set. The value of WSMAX also affects the allocation of permanently
resident memory for the swapper map and system page table (and for this
reason should not be set at an arbitrarily high number):
The amount of permanently resident memory set aside for the swapper map
and system page table is calculated based on the following rules:
•

Swapper map-4 bytes for each page of WSMAX

•

System page table-4 bytes for each 128 pages of WSMAX, multiplied by
the value of the BALSETCNT parameter

Generally, you should use as a value for WSMAX the size of the largest
working set needed on your system. The default value is appropriate for
normal time-sharing operations, while significantly larger values should be
used only for programs with very large virtual address spaces to reduce page
faulting.
XFMAXRATE (D)

XFMAXRATE limits the data transfer rate that can be set for DR32 devices.
On some hardware configurations (especially those without interleaved
memory), a high DR32 transfer rate could cause a machine check (CPU
timeout). The VMS 1/0 User's Reference Manual: Part I describes how to
encode this parameter.
Special System Parameters
CHANNELCNT

CHANNELCNT specifies the number of permanent 1/0 channels available to
the system.
·
CONCEAL_DEVICES

CONCEAL_DEVICES enables or disables the use of concealed devices. By
default, this parameter is set to enable concealed devices (1).
DLCEXTRASTK

DLCEXTRASTK specifies the amount of extra interrupt stack (in bytes) to
leave when doing a deadlock search.
EXUSRSTK

EXUSRSTK specifies the amount of space provided by the image activator to
recover from a stack overflow error.
IMGIOCNT

IMGIOCNT specifies the default number of pages of image 1/0 address space
to be allocated for the image activator if not specified at program link time.

A-39

Supplemental SYSGEN Information
A.2 Parameter Descriptions

IOTA
IOTA specifies the amount of time (in 10 millisecond units) to charge to
the current residence quantum for each voluntary wait. The correct value
approximates the cost of a disk 1/0 neglecting wait time.
LOCK RETRY
LOCKRETRY establishes the number of attempts made to lock a
multiprocessor data structure.
LRPMIN
LRPMIN sets the minimum allocation request size (in bytes) for large request
packets.
MPW_PRIO
MPW_PRIO sets the priority of 1/0 transfers initiated by the modified page
writer. The maximum value is 31, the minimum is 0, and the default is 4.
NOAUTOCONFIG
NOAUTOCONFIG controls whether or not all devices are automatically
configured when the system boots. The default value of 0 sets the system to
automatically configure all devices. NOAUTOCONFIG should only be set to
1 (no automatic configuration) for debugging purposes.
NOC LOCK
NOCLOCK controls whether or not the interval timer is inhibited when the
system boots. NOCLOCK should only be set to 1 (inhibit interval timer) for
debugging purposes.
NOC LUSTER
NOCLUSTER controls whether or not page read clustering is inhibited when
the system boots. NOCLUSTER should only be set to 1 (inhibit page read
clustering) for debugging purposes.
PAGTBLPFC
P AGTBLPFC specifies (in pages) the maximum number of page tables to read
to satisfy a fault for a nonresident page table.
PFRATS
PFRATS specifies the page fault rate threshold for the system.
PHYSICALPAGES
PHYISCALP AGES sets the maximum number of physical pages of memory to
be used on the system. Decreasing this parameter allows you to test smaller
configurations of memory without the need to remove memory boards.
PIXSCAN
PIXSCAN specifies the number of process index slots scanned each second
for computable or computable-outswapped processes. These processes receive
an automatic priority boost for 1 quantum, unless the priority of the currently
executing process is greater than 15. The priority boost is done to avoid
potential deadlocks on the system.
PSEUDOLOA
PSEUDOLOA specifies (in pages) the size of the PDAO system image. This
parameter is used to boot standalone BACKUP from magnetic tape.

A-40

Supplemental SYSGEN Information
A.2 Parameter Descriptions

RESALLOC
RESALLOC controls whether or not resource allocation checking is
performed. The default value of 0 disables resource allocation checking.
QBUS_MULT_INTR
QBUS_MULT_INTR enables multilevel interrupt dispatching on systems
that use the Q22 bus. Refer to the VMS Device Support Manual for more
information about the QBUS_MULT_INTR system parameter.
SMP_TICK_CNT
SMP_TICK_CNT sets the frequency of sanity timer checks by each CPU in a
multiprocessing system .
. so_PAGING
SO_P AGING enables paging of system code.
SRPMIN
SRPMIN sets the minimum allocation request size (in bytes) for small request
packets.
SSINHIBIT
SSINHIBIT controls whether or not system services are inhibited (on a per
process basis). By default, system services are not inhibited.
SWP_PRIO
SWP_PRIO sets the priority of 1/0 transfers initiated by the swapper.
SWPALLOCINC
SWPALLOCINC sets the size (in blocks) to use to back up swap file space
allocation in the swap or page file. Space in the file will be allocated multiples
of this unit (up to WSQUOTA) to guarantee swap space.
SWPFAIL
SWPFAIL sets the number of consecutive swap failures allowed before the
swap schedule algorithm is changed to ignore the swap quantum protection.
SWPRATE
SWPRATE sets the swapping rate (in 10 millisecond units). This parameter
limits the amount of disk bandwidth consumed by swapping.
SYS PFC
SYSPFC sets the number of pages to be read from disk on each system paging
operation. This parameter is not currently implemented.
TBSKIPWSL
TBSKIPWSL specifies the maximum number of working set list entries
that may be skipped while scanning for a "good" entry to discard. Set this
parameter to 0 to disable skipping.
VMS
VMSDl, VMSD2, VMSD3, VMSD4, VMSS, VMS6, VMS7, and VMS8 are
parameters reserved for DIGITAL use. VMSDl through VMSD4 are dynamic.

A-41

Supplemental SYSGEN Information
A.2 Parameter Descriptions

WRITABLESYS
WRITABLESYS controls whethers or not system code is writable. This
parameter is set (value of 1) for debugging purposes only.

A-42

UNIBUS/Q22 Bus Device Support

DIGITAL-supplied devices are attached to the UNIBUS or Q22 bus according
to the following basic rules:
•

A device of type A is always at a fixed and predefined CSR address; the
device always interrupts at a fixed and predefined vector address; only
one example of device A can be configured in each system.

•

A device of type Bis identical to type A except that 1 through n examples
can be configured in a single system. Examples 2 through n are also
located at fixed and predefined CSRs and vector addresses.

•

Devices of type C (1 through n of them) are always at fixed and
predefined CSR addresses; however, the interrupt vector addresses vary
according to what other devices are present on the system.

•

Devices of type D (1 through n of them) are at CSR addresses and vector
addresses that vary according to what other devices are present on the
system.

CSR and vector addresses that vary are called floating addresses. The devices
must be located in floating CSR and vector space according to the order in
which the devices appear in the SYSGEN device table. This table, shown
in Table B-1, lists all the type A and type B devices supported by VMS. It
also lists the type C and type D devices that are recognized by SYSGEN's
autoconfiguration procedure.
The base of floating vector space is 3008 . The base of floating CSR space is
760010g.

B.1

SYSGEN Device Table
The SYSGEN device Table B-1 lists the characteristics of all DIGITAL devices.
This table indicates the following information for each device type:
•

Device name

•

Device controller name

•

Interrupt vector

•

Number of interrupt vectors per controller

•

Vector alignment factor

•

Address of the first device register for each controller recognized by
SYSGEN (the first register is usually, but not always, the CSR)

•

Number of registers per controller

•

Device driver name

•

Indication of whether the driver is or is not supported

B-1

UNIBUS/Q22 Bus Device Support
8.1 SYSGEN Device Table

Devices not listed in the SYSGEN device table include:

Table B-1

•

Non-DIGITAL-supplied devices with fixed CSR and vector addresses .
These devices have no effect on autoconfiguration. Customer-built
devices should be assigned CSR and vector addresses beyond the floating
address space reserved for DIGITAL-supplied devices.

•

Those DIGITAL-supplied floating-vector devices that the
AUTOCONFIGURE command does not recognize. Use the CONNECT
command to attach these devices to the system.

SYSGEN Device Table

Device
Name

Controller
Name

Number
of
Vector Vectors

CR11

230

777160

CRDRIVER

Yes

RK611

210

777440

DMDRIVER

Yes

LP11

200
170
174
270
274

777514
764004
764014
764024
764034

LPDRIVER

Yes

RL11

160

774400

DLDRIVER

Yes

TS11

224

772520

TSDRIVER

Yes

RX211

264

777170

DYDRIVER

Yes

RB730

250

775606

DODRIVER

Yes

UDA

154

772150

PU DRIVER

Yes

TU81

260

774500

PU DRIVER

Yes

UNA

120

774510

XEDRIVER

Yes

ONA

120

774440

XODRIVER

Yes

DC11

Float

774000
774010
774020
774030

OMDRIVER

DDRIVER

Yes

Vector
CSR
Alignment /Rank

Support

32 units
maximum
DD

TU58

Float

776500
776510
776520
776530

16 units
maximum

B-2

UNIBUS/022 Bus Device Support
B.1 SYSGEN Device Table

Table B-1 (Cont.)

SYSGEN Device Table

Device
Name

Controller
Name

Number
of
Vector Vectors

Vector
CSR
Alignment /Rank

ON 11

Float

775200
775210
775220
775230

Support

OBDRIVER

YMDRIVER

OADRIVER

PRDRIVER

PPDRIVER

16 units
maximum
YM

DM11B

Float

770500
770510
770520
770530

16 units
maximum
OA

DR11C

Float

767600
767570
767560
767550

16 units
maximum
PR

PR611

Float

772600
772604
772610
772614

8 units
maximum

PP611

Float

772700
772704
772710
772714

8 units
maximum

B-3

UNIBUS/022 Bus Device Support
B.1 SYSGEN Device Table

Table B-1 (Cont.)

SYSGEN Device Table

Device
Name

Controller
Name

Number
of
Vector Vectors

Vector
CSR
Alignment /Rank

oc.

DT11

Float

777420
777422
777424
777426

Support

QC DRIVER

8 units
maximum
OD

DX11

Float

776200
776240

ODDRIVER

DL11C

Float

775610
775620
775630
775640

YLDRIVER

31 units
maximum
YJ

DJ11

Float

YJDRIVER

DH11

Float

YHDRIVER

GT40

Float

772000
772010

OEDRIVER

LPS11

Float

770400

LSDRIVER

0011

Float

ORDRIVER

KW11W

Float

772400

OF DRIVER

DU11

Float

XU DRIVER

DV11

Float

775000
775040
775100
775140

XVDRIVER

LK 11

Float

OGDRIVER

DMC11

Float

XMDRIVER

Yes

TTA

DZ11

Float

DZDRIVER

Yes

KMC11

Float

XKDRIVER

LPP11

Float

OH DRIVER

VMV21

Float

OIDRIVER

VMV31

Float

OJ DRIVER

DWR70

Float

OKDRIVER

RL11

Float

DLDRIVER

Yes

B-4

UNIBUS/Q22 Bus Device Support
B.1 SYSGEN Device Table

Table B-1 (Cont.)

SYSGEN Device Table

Device
Name

Controller
Name

Number
of
Vector Vectors

Vector
CSR
Alignment /Rank

TS11

Float

772524
772530
772534

TSDRIVER

Yes

LPA 11

Float

770460

LA DRIVER

Yes

LPA 11

Float

LADRIVER

Yes

KW11C

Float

OLD RIVER

RX211

Float

DYDRIVER

Yes

DR11W

Float

DR11B

124

DR11B

Float

DR11B

Float

Support

XADRIVER

Yes

772410

XBDRIVER

772430

XBDRIVER

Float

XBDRIVER

DMP11

Float

XDDRIVER

Yes

DPV11

Float

ONDRIVER

ISB11

Float

ISDRIVER

DMV11

Float

XDDRIVER

UNA

Float

XEDRIVER

ONA

Float

774460

XODRIVER

Yes

UDA

Float

PU DRIVER

Yes

KMS11

Float

XSDRIVER

PCL11

Float

764200
764240
764300
764340

XPDRIVER

VS100

Float

VBDRIVER

TU81

Float

PUDRIVER

Yes

KMV11

Float

OODRIVER

KCT32

Float

764400
764440
764500
764540

UKDRIVER

IE011

Float

764100

IXDRIVER

DHV11

Float

YFDRIVER

Yes

TC11

214

DTDRIVER

vc
vc

VCB01

Float

777200

VCB01

Float

LNV11

Float

776200

LNV21

Float

OTA

Float

772570

OTA

Float

777340

VCDRIVER

Yes

VCDRIVER

Yes

OTDRIVER

LDDRIVER

ZODRIVER

B-5

UNIBUS/Q22 Bus Device Support
B.1 SYSGEN Device Table

Table B-1 (Cont.)

SYSGEN Device Table

Device
Name

Controller
Name

Number
of
Vector Vectors

Vector
CSR
Alignment /Rank

Support

DSV11

Float

SJ DRIVER

ADV11C

Float

OU DRIVER

ov
ov

AAV11C

Float

770440

OVDRIVER

AAV11C

Float

OVDRIVER

AXV11C

140

AXDRIVER

AXV11C

Float

AXDRIVER

770420

KZDRIVER

776400
Float

KWV11C

Float

KWV11C

Float

KWV11W

Float

772400

OFDRIVER

ADV11D

Float

776410

AZDRIVER

ADV11D

Float

AZDRIVER

AAV11D

Float

776420

AYDRIVER

AAV11D

Float

AYDRIVER

VCB02

Float

777400
777402
777404
777406

VADRIVER

Yes

ON DRIVER

8 units
maximum
DN

DRV11J

Float

764160
764140
764120

DRQ3B

Float

HXDRIVER

VSV24

Float

VQDRIVER

VSV21

Float

VVDRIVER

18001

Float

BODRIVER

MIRA

Float

UTDRIVER

IE011

Float

IXDRIVER

AD032

Float

AWDRIVER

DTC04

Float

VXDRIVER

B-6

VAXstation 2000/MicroVAX 2000 Device Support

VMS provides configuration support and includes drivers for standard and
optional VAXstation 2000 devices. Connectors and device controllers included
on the VAXstation 2000/MicroVAX 2000 system board are as follows:
•

Four asynchronous serial ports for an LK201 keyboard, pointing device,
modem, and printer

•

A controller for a VR260 monochrome display

•

A controller for disk mass storage, supporting the following options:
RX33 diskette drive
RD32 41Mb hard disk drive
RD53 69Mb hard disk drive
RD54 155Mb hard disk drive

•

A controller for a TKSO cartridge tape system

In addition, an assortment of option boards is available to a VAXstation 2000 /
Micro VAX 2000 system, including the following:
•

Additional memory

•

A DESVA thinwire Ethernet controller

•

A 4-plane color video controller (for VAXstation 2000)

•

An 8-port serial line adapter (for MicroVAX 2000)

The actual devices that can be connected to an individual VAXstation 2000 /
MicroVAX 2000 system depend upon its particular configuration.

C.1

Configuring VAXstation 2000/MicroVAX 2000 Devices
The VMS System Generation Utility (SYSGEN) connects devices, loads
their drivers, creates the data structures by which the VMS operating
system and drivers coordinate their activities, and calls device initialization
routines. In general, SYSGEN is invoked for these purposes late in system
initialization during the execution of the system startup command procedure,
SYS$SYSTEM:STARTUP.COM.
At that time, STARTUP.COM issues a SYSGEN AUTOCONFIGURE ALL
command. SYSGEN's Autoconfigure facility examines its table of possible
VAXstation 2000/MicroVAX 2000 devices (see Table C-1), determines which
devices are attached to the system, and configures existing devices using
information in the table.
DIGITAL strongly recommends that you accept the default behavior of
STARTUP.COM. If you must exclude a specific device from being configured,
you must first prevent STARTUP .COM from performing the autoconfiguration
by setting the SYSBOOT parameter NOAUTOCONFIG. After invoking
C-1

VAXstation 2000/MicroVAX 2000 Device Support
C.1 Configuring VAXstation 2000/MicroVAX 2000 Devices

SYSGEN, you should ensure that the base asynchronous serial ports are
always autoconfigured. To do this, enter the following command:
SYSGEN> AUTOCONFIGURE ALL/SELECT=TT:

You can also enter an AUTOCONFIGURE ALL/EXCLUDE=(devicename[, ... ]) command, making sure not to exclude the serial lines. Subsequent
CONNECT statements should be written with the appropriate csr_addr value
to the command's /CSR qualifier, as shown in Table C-1. These csr_addr
values are actually offsets from the beginning of VAXstation 2000 /
MicroVAX 2000 1/0 space (EXE$GL_CPUNODSP), thus differing from the
customary bus address value traditionally specified for UNIBUS devices in the
CONNECT command.
Table C-1

VAXstation 2000 Autoconfiguration Table

Device

Name

Driver

CSR

Number of
Vectors

First
Vector

Vector Offset

Standard Serial Lines

YEDRIVER

AX0800

A0300

ST506 Disk Controller

DVDRIVER

Axocoo

A0774

TK50 Tape Controller

TVDRIVER

AXOC80

A0770

A0120

A0104

Ethernet Controller

ESDRIVER

AX4EOO

MicroVAX 2000 Serial Lines

YFDRIVER

AX6800

32-Channel Synchronous
Lines

ZSDRIVER

AX6800

Color Video Option

VFDRIVER

AX6AOO

Black & White Video Option

VEDRIVER

AX5000

A0110
2

Examples of correct CONNECT commands for VAXstation 2000 /MicroVAX
2000 devices include the following:
CONNECT ESAO /ADAP=O /CSR=%X4EOO /VECT=%0120 /NUMV=01 /DRIVER=ESDRIVER
CONNECT MUAO /ADAP=O /CSR=%XOC80 /VECT=%0770 /NUMV=01 /DRIVER=TVDRIVER
CONNECT DUAO /ADAP=O /CSR=%XOCOO /VECT=%0774 /NUMV=01 /DRIVER=DVDRIVER
CONNECT DUA1 /ADAP=O /CSR=%XOCOO /VECT=%0774 /NUMV=01 /DRIVER=DVDRIVER
CONNECT DUA2 /ADAP=O /CSR=%XOCOO /VECT=%0774 /NUMV=01 /DRIVER=DVDRIVER
CONNECT VCAO /ADAP=O /CSR=%X5000 /VECT=%0104 /NUMV=01 /DRIVER=VEDRIVER
CONNECT VCAO /ADAP=O /CSR=%X5000 /VECT=%0104 /NUMV=02 /DRIVER=VFDRIVER

C-2

Index

A
ACP system parameters
See System parameters
ALLOCLASS parameter• A-8
Autoconfiguration • C-1
table•C-2
AUTOCONFIGURE command• SGN-5
A WSMIN parameter• A-8
A WSTIME parameter• A-8

B
BALSETCNT parameter• A-8
BJOBLIM parameter• A-9
BORROWLIM parameter• A-9
BUGCHECKFA T AL parameter• A-9
BUGREBOOT parameter• A-9

c
CLISYMTBL parameter• A-9
Command interpreter
symbol table• A-9
CONFIGURE command• SGN-8
CONNECT/ ADAPTER=adapter-spec command•
SGN-10
CONNECT CONSOLE command• SGN-13
CONNECT /NOADAPTER command• SGN-12
CRDENABLE parameter• A-9
CREA TE command• SGN-14
CSR
fixed space• B-1
floating space • B-1

D
DEADLOCK_WAIT parameter• A-10
DEFMBXBUFOUO parameter• A-10
DEFMBXMXMSG parameter• A-10

DEFMBXNUMMSG parameter• A-10
DEFPRI parameter• A-10
DEFOUEPRI parameter• A-10
Device
configuring• C-1 to C-2
DIGIT AL-supplied• B-1 to B-2
Device driver
configuring• SGN-5
connecting• SGN-10
loading• SGN-22
replacing with new version of• SGN-24
showing configuration of• SGN-32
showing information • SGN-35
showing information about• SGN-34
Device types
codes • SGN-5
descriptions • SGN-5
DISABLE CHECKS command• SGN-16
DISK_QUORUM parameter• A-10
DISMOUMSG parameter• A-10
DORMANTWAIT parameter• A-10
DUMPBUG parameter• A-11
Dump file
creating or extending• SGN-14
DUMPSTYLE parameter• A-11
Dynamic parameters
modifying• SGN-44

E
ENABLE CHECKS command• SGN-1 7
ERRORLOGBUFFERS parameter• A-11
EXE$GL_CPUNODSP•C-2
EXIT command• SGN-18
EXPECTED_VOTES parameter• A-11
EXTRA CPU parameter• A-11

F
File
dump• SGN-14
page • SGN-14
swap• SGN-14
system parameter• SGN-44

lndex-1

Index

Floating address• B-1
FREE GOAL parameter• A-11
FREELIM parameter• A-12

G
GBLP AGES parameter• A-12
GBLP AGFIL parameter• A-12
GBLSECTIONS parameter• A-13
GROWLIM parameter• A-13

H
HELP command • SGN-19

I
1/0 driver
loading• SGN-22
replacing with new version of• SGN-24
IJOBLIM parameter• A-13
INST ALL command• SGN-21
INTSTKPAGES parameter• A-13
IRPCOUNT parameter• A-13
IRPCOUNTV parameter• A-14

L
LAMAPREGS parameter• A-14
LGI system parameters
See System parameters
LNMPHASHTBL parameter• A-15
LNMSHASHTBL parameter• A-15
LOAD command • SGN-22
LOCKDIRWT parameter• A-15
LOCKIDTBL parameter• A-15
LOCKIDTBL _MAX parameter• A-16
LONGW AIT parameter• A-16
LRPCOUNT parameter• A-16
LRPCOUNTV parameter• A-16
LRPSIZE parameter• A-16

M
MAXBUF parameter• A-17
MAXPROCESSCNT parameter• A-1 7
MAXOUEPRI parameter• A-17
MAXSYSGROUP parameter• A-17
Memory
multiport • SGN-28
MINWSCNT parameter• A-17
MOUNTMSG parameter• A-17
MPW_HILIMIT parameter• A-17
MPW_IOLIMIT parameter• A-18
MPW_LOLIMIT parameter• A-18
MPW_LOW AITLIMIT parameter• A-18
MPW_THRESH parameter• A-18
MPW_ W AITLIMIT parameter• A-18
MPW_ WRTCLUSTER parameter• A-19
MSCP command• SGN-23
MSCP server
loading• SGN-23
starting• SGN-23
MSCP_BUFFER parameter• A-19
MSCP_CREDITS parameter• A-19
MSCP_LOAD parameter• A-19
MSCP_SERVE_ALL parameter• A-19
Multiport memory
connecting• SGN-28
initializing • SGN-29
MULTl PROCESS ING parameter• A-19
MVTIMEOUT parameter• A-20

N
Nexus numbers
showing• SGN-31
NISCS_CONV_BOOT parameter• A-20
NISCS_LOAD_PEAO parameter• A-20
NISCS_PORT_SERV parameter• A-20
NJOBLIM parameter• A-20
NPAGEDYN parameter• A-20
NP AGEVIR parameter• A-20

p
PAGEDYN parameter• A-21

lndex-2

Index

Page file

SCS system parameters

activating secondary• SGN-21
creating or extending• SGN-14
PAGFILCNT parameter• A-21
PAMAXPORT parameter• A-21
PANOPOLL parameter• A-2 1
PANUMPOLL parameter• A-21
PAPOLLINTERV AL parameter• A-22
PAPOOLINTERV AL parameter• A-22
Parameter file
writing• SGN-44
PASANITY parameter• A-22
PASTDGBUF parameter• A-22
PASTIMOUT parameter• A-22
PFCDEFAULT parameter• A-22
PFRA TH parameter• A-23
PFRA TL parameter• A-23
POL system parameters
See System parameters
PROCSECTCNT parameter• A-26

See System parameters
Server
MSCP • SGN-23
SET /OUTPUT command• SGN-25
SET parameter-name command• SGN-26
SET /STARTUP command• SGN-27
SETTIME parameter• A-30
SHADOWING parameter• A-30
SHARE command• SGN-28
SHARE/INITIALIZE command• SGN-29
SHOW/ ADAPTER command• SGN-31
SHOW/CONFIGURATION command• SGN-32
SHOW /DEVICE=device-driver • SGN-34
SHOW /DRIVER=device-driver • SGN-35
SHOW/STARTUP•SGN-39
SHOW /UNIBUS command• SGN-40
SHOW [parameter] command• SGN-36
SMP_CPUS parameter• A-30
SMP_LNGSPINW AIT parameter• A-31
SMP_SANITY_CNT parameter• A-3 1
SMP_SPINWAIT parameter• A-31
SPTREQ parameter• A-31
SRPCOUNT parameter• A-31
SRPCOUNTV parameter• A-31
Startup command procedure
site-independent file name• SGN-39
STARTUP_Pn system parameters• A-32
Swap file
activating secondary• SGN-21
creating or extending • SGN-14
SWPFILCNT parameter• A-32
SWPOUTPGCNT parameter• A-32
Symbol table
command interpreter• A-9
SYS$SYSTEM:ST ART UP .COM• C-1
SYSBOOT facility
using during bootstrap operations• SGN-1
SYSMWCNT parameter• A-32
System Generation Utility (SYSGEN)
device table• B-1 to B-2
exiting • SGN-3
invoking• SGN-3
System parameters
ACP • A-5 to A-8
categories• A-1
descriptions• A-5 to A-42
LGI • A-14 to A-1 5
POL• A-23 to A-26
SCS • A-29 to A-30
setting• SGN-26

a
QDSKINTERV AL parameter• A-26
QDSKVOTES parameter• A-26
QUANTUM parameter• A-26
QUORUM parameter• A-26

R
Range checks
disabling• SGN-16
enabling• SGN-17
REALTIME_SPTS parameter• A-26
RECNXINTERVAL parameter• A-27
RELOAD command• SGN-24
RESHASHTBL parameter• A-27
RJOBLIM parameter• A-27
RMS system parameters• A-27 to A-28
RMS_DFMBC parameter• A-27
RMS_DFNBC parameter• A-27

s
SA VEDUMP parameter• A-29

lndex-3

Index

System parameters (cont'd.)
shovving • SGN-36
summary• A-1
TTY• A-33 to A-3 7

T
T APE_MVTIMEOUT parameter• A-32
TERMINAL/ECHO command• SGN-42
TIMEPROMPTW AIT parameter• A-32
TTY system parameters
See System parameters

u
UAFALTERNATE parameter• A-37
UDABURSTRATE parameter• A-37
USE command • SGN-43
USER3 parameter• A-37
USER4 parameter• A-3 7
USE RD 1 parameter• A-3 7
USERD2 parameter• A-3 7

lndex-4

v
VAXCLUSTER parameter• A-37
Vector
fixed space• B-1
floating space• B-1
VIRTUALPAGECNT parameter• A-38
VOTES parameter• A-38

w
WINDQW_SYSTEM parameter• A-38
WRITE command• SGN-44
WSDEC parameter• A-38
WSINC parameter• A-38
WSMAX parameter• A-39

x
XFMAXRA TE parameter• A-39

Reader's Comments

VMS System Generation
Utility Manual
AA-LA30A-TE

Please use this postage-paid form to comment on this manual. If you require a written reply to a software
problem and are eligible to receive one under Software Performance Report (SPR) service, submit your
comments on an SPR form.
Thank you for your assistance.

I rate this manual's:
Accuracy (software works as manual says)
Completeness (enough information)
Clarity (easy to understand)
Organization (structure of subject matter)
Figures (useful)
Examples (useful)
Index (ability to find topic)
Page layout (easy to find information)

Excellent

Good

Fair

Poor

D
D
D
D
D
D
D
D

I would like to see more/less

What I like best about this manual is

What I like least about this manual is

I found the following errors in this manual:
Page
Description

Additional comments or suggestions to improve this manual:

I am using Version ___ of the software this manual describes.

Name/Title

Dept.
Date

Company
Mailing Address
Phone

- Do Not Tear - Fold Here and Tape

-------------------[lllr---------------

I
I
I
I
I
I

No Postage

~nmnama™

~;~=~=~y
in the
United States

BUSINESS REPLY MAIL
FIRST CLASS PERMIT NO. 33 MAYNARD MASS.
POSTAGE WILL BE PAID BY ADDRESSEE

DIGIT AL EQUIPMENT CORPORATION
Corporate User Publications-Spit Brook
ZK01-3/J35 110 SPIT BROOK ROAD
NASHUA, NH 03062-9987

111 ..... 11.11 .... 11 .... 1.11.1 .. 1.1 .. 1•• 1.1 ••• 1.11 •• 1
- Do Not Tear - Fold Here - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

...,
c
....
c

I I
I~
I""

11
It.

I
I

Reader's Comments

VMS System Generation
Utility Manual
AA-LA30A-TE

Excellent

Good

Fair

Poor

D
D
D
D
D
D
D
D

I would like to see more /less

What I like best about this manual is

What I like least about this manual is

I found the following errors in this manual:
Page
Description

Additional comments or suggestions to improve this manual:

I am using Version ___ of the software this manual describes.

Name/Title

Dept.
Date

Company
Mailing Address
Phone

-;;~~~;:d

Here and Tape -------------------nnr-------;~i,~y~--in the
United States

BUSINESS REPLY MAIL
FIRST CLASS PERMIT NO. 33 MAYNARD MASS.
POST AGE WILL BE PAID BY ADDRESSEE

DIGIT AL EQUIPMENT CORPORATION
Corporate User Publications-Spit Brook
ZKO 1-3I J35 110 SPIT BROOK ROAD
NASHUA, NH 03062-9987

111 ..... 11.11 .... 11 .... 1.11.1 •• 1.1 .. 1•• 1.1 ••• 1.11 .. 1
- Do Not Tear - Fold Here - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

I
I
I
I
I
I