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EK-NVRAM-OM-001

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Document:	Decsystem 5100 Prestoserve/NVRAM Option Information
Order Number:	EK-NVRAM-OM
Revision:	001
Pages:	44
Original Filename:

OCR Text

DECsystem 5100
PrestoServe/NVRAM Option Information
Order Number EK-NVRAM-OM-001
Revision/Update Information:

Digital Equipment Corporation

This is a new manual.

First Edition, February 1991
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.
Restricted Rights: Use, duplication, or disclosure by the U. S. Government is subject to
restrictions as set forth in subparagraph ( c ) ( 1 ) ( ii ) of the Rights in Technical Data and
Computer Software clause at DFARS 252.227–7013.
Copyright © Digital Equipment Corporation 1991
All Rights Reserved.
Printed in U.S.A.
FCC NOTICE: The equipment described in this manual has been certified to comply
with the limits for a Class B computing device, pursuant to Subpart J of Part 15 of FCC
Rules. Only peripherals (computer input/output devices, terminals, printers, etcetera)
certified to comply with the Class B limits may be attached to this computer. Operation
with noncertified peripherals may result in interference to radio and television reception.
This equipment generates and uses radio frequency energy and if not installed and used
properly, that is, in strict accordance with the manufacturer’s instructions, may cause
interference to radio and television reception. It has been type tested and found to comply
with the limits for a Class B computing device in accordance with the specifications in
Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection
against such interference in a residential installation. However, there is no guarantee
that interference will not occur in a particular installation. If this equipment does cause
interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
–
Reorient the receiving antenna.
–
Move the computer away from the receiver.
–
Plug the computer into a different outlet so that computer and receiver are on
different branch circuits.
If necessary, the user should consult the dealer or an experienced radio/television
technician for additional suggestions. The user may find the following booklet prepared by
the Federal Communications Commission helpful: How to Identify and Resolve Radio-TV
Interference Problems. This booklet is available from the US Government Printing Office,
Washington, DC 20402, Stock No. 004–000–00398–5
The following are trademarks of Digital Equipment Corporation: DEC, DECsystem,
ULTRIX, and the DIGITAL logo.
The following is a trademark of Legato Systems, Inc.: PrestoServe.

Contents
About This Manual
1

PrestoServe/NVRAM Option

1.1
1.2
1.3

PrestoServe/NVRAM Option . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NVRAM Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installing the NVRAM Modules . . . . . . . . . . . . . . . . . . . . . . .

4.1

2–1

Operation

3.1
3.1.1
3.1.2
3.2
3.2.1
3.3
3.4

1–1
1–1
1–2

Installation

2.1

vii

Running the Power-Up Self-Test . . . . . . . . . . . . . . . . . . . . . . 3–1
Unsuccessful Power-Up Self-Test . . . . . . . . . . . . . . . . . . . . 3–3
Interpreting the Power-Up Self-Test Results . . . . . . . . . . . 3–4
Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5
Configuration Command . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5
Using the prcache Console Command . . . . . . . . . . . . . . . . . . 3–8
Moving the NVRAM Modules . . . . . . . . . . . . . . . . . . . . . . . . . 3–10

Troubleshooting

Executing the PrestoServe/NVRAM Option Diagnostic (test
0x9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.1
PrestoServe/NVRAM Option Installed but Not Configured
4.2
Handling Failed NVRAM Modules (FRU Part Number
54-20474-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.1
Disable Battery/Zero the PrestoServe/NVRAM Option
Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1
4–2
4–3
4–4
iii

iv Contents

4.3

Recovering PrestoServe/NVRAM Option Cache Data After
Replacing the System Module . . . . . . . . . . . . . . . . . . . . . . . .

4–5

Index
Examples
3–1
3–2
3–3
3–4
3–5
3–6
3–7
3–8
4–1
4–2

Successful Power-Up Self-Test Display . . . . . . . . . . . . . . . . . .
Power-Up Self-Test Display with Memory Error . . . . . . . . . .
Unsuccessful Power-Up Self-Test Example . . . . . . . . . . . . . . .
Brief System Configuration Display . . . . . . . . . . . . . . . . . . . .
Full System Configuration Display . . . . . . . . . . . . . . . . . . . .
Memory Configuration Display . . . . . . . . . . . . . . . . . . . . . . .
SCSI Device Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General System Configuration Display . . . . . . . . . . . . . . . . .
PrestoServe/NVRAM Option Cache is Dirty
(Contains Valid Data) - test 0x9 . . . . . . . . . . . . . . . . . . . . . . .
PrestoServe/NVRAM Option Cache is Clean
(Contains No Data) - test 0x9 . . . . . . . . . . . . . . . . . . . . . . . .

3–2
3–3
3–4
3–5
3–6
3–7
3–7
3–8
4–2
4–2

Figures
2–1
2–2
2–3
2–4
2–5
2–6
2–7
2–8
3–1

Location of On/Off Switch and Cover Screws . . . . . . . . . . . . . 2–2
Drive Mounting Panel Power and Signal Cabling . . . . . . . . . 2–3
Releasing the Upper Drive Mounting Panel . . . . . . . . . . . . . . 2–4
Releasing the Lower Drive Mounting Panel . . . . . . . . . . . . . . 2–5
Removing NVRAM Module . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8
Location of Memory Banks . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9
Sample Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10
NVRAM Module Installation . . . . . . . . . . . . . . . . . . . . . . . . . 2–11
Location of On/Off Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1

Contents v

Tables
2–1
2–2
3–1

MS44 Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Module and NVRAM Module Configurations . . . . . .
Memory Size Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–6
2–6
3–2

About This Manual
The DECsystem 5100 PrestoServe/NVRAM Option Information
manual describes how to install, operate, and troubleshoot the
PrestoServe/NVRAM option.
NOTE
The PrestoServe/NVRAM option must be installed and serviced
only by Customer Services personnel or self-maintenance
customers.

Audience
This manual is intended for Digital Customer Services personnel, selfmaintenance customers, and general users.

Organization
This manual has four chapters and an index.
•

Chapter 1, PrestoServe/NVRAM Option, describes the
PrestoServe/NVRAM option.

•

Chapter 2, Installation, describes how to install the NVRAM modules.

•

Chapter 3, Operation, describes how to run the power-up self-test,
interpret its results, and use the PrestoServe/NVRAM option console
commands.

•

Chapter 4, Troubleshooting, describes fault isolation, how to handle
failed NVRAM modules, and how to recover cache data.

vii

viii About This Manual

Related Documentation
You can order the following documentation from Digital:
Document

Order Number

DECsystem 5100 Maintenance Guide

EK–422AA–MG

DECsystem 5100 Operator’s Guide

EK–421AA–OG

Conventions
The following conventions are used in this manual:
Convention

Meaning

CAUTION

Provides information to prevent damage to equipment or
software.

NOTE

Provides general information about the current topic.

1
PrestoServe/NVRAM Option
This chapter describes the PrestoServe/NVRAM option.

1.1 PrestoServe/NVRAM Option
The PrestoServe/NVRAM option is a hardware and software option on
the DECsystem 5100 that improves input/output (I/O) response and
throughput. The PrestoServe/NVRAM option operates using specially
designed, nonvolatile RAM (NVRAM) as a disk write cache. This memory
cache has a battery backup to prevent data loss caused by power failures,
system crashes, and normal maintenance procedures.
As a write cache for disks, the PrestoServe/NVRAM option provides
substantial improvement in performance while maintaining full file
system compatibility. Any application that performs synchronous writes
to disk through the ULTRIX file system (such as Network File System
(NFS) operations) can benefit from the PrestoServe/NVRAM option.
Digital licenses PrestoServe from Legato Systems, Inc.

1.2 Ordering Information
The PrestoServe/NVRAM option consists of the following modules:
Part Number

Description

DJ-51MPS-AA

PrestoServe DECsystem 5100, factory-installed

DJ-51MPS-AF

PrestoServe DECsystem 5100, field-installed

1–1

1–2 PrestoServe/NVRAM Option

1.3 NVRAM Modules
The PrestoServe/NVRAM option consists of two 512 Kbyte modules.
Two modules are required because of the width of the DECsystem 5100
memory bus (64 bits). One module contains even words and is located
towards the rear of the machine (the rear NVRAM SIMM). The other
module contains odd words and is located towards the front of the
machine (the front NVRAM SIMM). These modules must be installed
in the last bank of populated memory.

2
Installation
This chapter describes how to install the NVRAM modules.

2.1 Installing the NVRAM Modules
The PrestoServe/NVRAM option can be installed either at the factory, or
on-site by Customer Services personnel or self-maintenance customers.
CAUTION
Always wear an antistatic wrist strap and use an antistatic mat
when replacing field replaceable units (FRUs).
To install the NVRAM modules:
1. Remove the system unit cover by performing the following steps:
a. Turn the system power off (O). See Figure 2–1.
b. Label and disconnect all the cables connected to the system unit.
c.

Loosen the two captive cover screws on the back panel of the
system unit (Figure 2–1).

d. Slide the cover forward, and up from the system unit.

2–1

2–2 Installation

Power On/Off Switch

Captive Cover
Screws

RE_EN05169A_90
LJ-00440-TI0

Figure 2–1

Location of On/Off Switch and Cover Screws

2. Remove the upper drive mounting panel as follows:
CAUTION
It is important to note which cables connect to which drives.
When disconnecting cables, write the type of drive and its
position on a piece of tape and wrap the tape around the
connector before you disconnect the cable. This will help you
to reinstall the upper drive mounting panel.
a. Disconnect the power harnesses from the H7822 power supply and
disconnect the SCSI bus cable from the drives on the upper drive
mounting panel (Figure 2–2).
b. Unscrew the four captive screws (Figure 2–3).
c.

Lift the upper drive mounting panel from the lower drive
mounting panel and gently set it aside.

d. Note the position of the metal partition, then remove it from the
lower drive mounting panel.
NOTE
Depending on your system configuration, the upper drive
mounting panel can contain one, two, or three 3.5-inch hard
disk drives.

Installation 2–3

Adapter (TZ30 Only)

SCSI Connector
to System Module

External SCSI
Connector
Power Harnesses

Power Connectors
for RX23 FDI
Boards

RZ23 or
RZ24 or
RX23

H7822
Power
Supply

TZ30 or
RZ23 or
RZ24 or
RX23

Lower Drive
Mounting Panel

SCSI Bus Cable

Upper Drive
Mounting Panel

RZ23 or
RZ24

Upper Drive Panel Power
Lower Drive Panel Power
Data
RE_EN05176A_90
LJ-00441-TI0

Figure 2–2

Drive Mounting Panel Power and Signal Cabling

2–4 Installation

Captive Screws (2)

Upper Drive
Mounting Panel

Captive Screws (2)

RE_EN05177A_90
LJ-00442-TI0

Figure 2–3

Releasing the Upper Drive Mounting Panel

3. Remove the lower drive mounting panel as follows:
Depending on the configuration, the DECsystem 5100 that you are
servicing may contain an option installed on the lower drive mounting
panel. If the option is installed, then begin with step a. If the option
is not installed, then begin with step b.
a. Disconnect the cables at the option.
NOTE
The lower drive mounting panel can contain devices in
combinations that are restricted by the following rules:
•

You can install the RZ2n disk drives and the RX2n
diskette drive in either the left or right compartments.

Installation 2–5

•

You can install the TZ30 tape drive in the right
compartment only.

CAUTION
Wear an antistatic wrist strap and use an antistatic mat
when replacing FRUs.
b. Unscrew the four captive screws and remove the three Phillips
screws on the left side of the unit (Figure 2–4). Store the screws
in a safe place.
c.

Slide the panel forward (with the devices attached), then lift the
panel from the system unit and gently set it aside.

NOTE
When you remove the lower drive mounting panel, the option
remains attached to the lower drive mounting panel.

Captive Screws (2)

Lower Drive Mounting Panel
Phillips Screws
(3 Loosened)
RE_EN05181A_90
LJ-00443-TI0

Figure 2–4

Releasing the Lower Drive Mounting Panel

2–6 Installation

4. Identify the connectors of the memory bank in which you want to
install the NVRAM modules. For bank locations, and memory module
and NVRAM module configurations, see Table 2–1, Table 2–2, and
Figure 2–7.
Table 2–1 MS44 Information
Variation

MS44-xx

Description

MS44-AA

4-Mbyte SIMM module

FRU for Customer Services

MS44-BA

8 Mbytes (2

1 bank of memory for upgrade

MS44-CA

16-Mbyte SIMM module

MS44-DA

32 Mbytes (2

MS44-AA)
MS44-CA)

FRU for Customer Services
1 bank of memory for upgrade

Table 2–2 Memory Module and NVRAM Module Configurations
Memory
Size in
Megabytes

NVRAM
Size in
Megabytes

Bank 0

Bank 1

Bank 2

Bank 3

MS44-BA

NVRAM

—

MS44-BA

NVRAM

—

MS44-BA

NVRAM

MS44DA

NVRAM

—

MS44DA

MS44-BA

NVRAM

—

MS44DA

MS44-BA

NVRAM

MS44DA

NVRAM

—

MS44DA

MS44-BA

NVRAM

MS44DA

NVRAM

MS44-DA memory modules are always located before MS44-BA memory modules.

Installation 2–7

NOTE
Memory module and NVRAM module configurations of 56
Mbytes and 80 Mbytes are not possible.
The NVRAM modules must be installed in the next available
bank (the highest numbered available bank).
CAUTION
To remove MS44 memory modules ensure that the two locking
tabs are disengaged, otherwise damage to the connectors will
occur. You must remove the modules contained in the highest
available banks first, in order to access the locking tabs of the
other memory modules (Figure 2–5).
The two NVRAM modules are always installed in the same bank and
they must be installed in the next available bank. If all the banks in
the system are full, then the last bank of memory must be removed
and the NVRAM modules must be installed in the last bank (bank 3).
In a typical configuration, the DECsystem 5100 contains MS44
memory and NVRAM modules located in the following positions
(also see Figure 2–6):
•

Bank 0 has two MS44-CAs (32 Mbytes).

•

Bank 1 has two MS44-AAs (8 Mbytes).

•

Bank 2 has the NVRAM modules.

•

Bank 3 is empty.

2–8 Installation

MS44
Module

Locking
Tab
Key

Module
Connector

Locking Tab

LJ-00445-TI0

Figure 2–5

Removing NVRAM Module

Installation 2–9

Bank
Number
Blank
(3)
NVRAM
(2)
MS44-AA
(1)

Power
Supply

MS44-CA
(0)

MS44-CA
(0)
MS44-AA
(1)
NVRAM
(2)
Blank
(3)

Front of DECsystem 5100
(Top View)
LJ-00469-TI0

Figure 2–6

Location of Memory Banks

The DECsystem 5100 contains a total of 40 Mbytes of memory and
1 Mbyte of NVRAM. Notice that the two MS44-CA modules are
installed in the lowest numbered memory bank (bank 0) before the
two MS44-AA modules (bank 1). The NVRAM modules are installed
in the next available bank (bank 2).

2–10 Installation

Banks
0
1
2
3

System Module
MS44 Memory Module
NVRAM Module

RE_EN05185A_90
LJ-00448-TI0

Figure 2–7

Sample Configuration

CAUTION
Wear an antistatic wrist strap and use an antistatic mat when
replacing FRUs.
5. To install the first NVRAM module, follow the steps shown in
Figure 2–8:

Installation 2–11

1
Module
Connector
Module
Notch
Module
Slot

NVRAM
Module

Locking
Tab
Key

LJ-00444-TI0

Figure 2–8

NVRAM Module Installation

2–12 Installation

Align the module with the key.

Insert the module, with the side containing the bar code label
facing up, into the connector on the system module. Gently press
down on the module.

Verify that the locking tabs are engaged.

If the memory needs to be reconfigured, refer to Table 2–1
and Table 2–2. For detailed information concerning memory
reconfigurations, refer to the DECsystem 5100 Maintenance Guide.
CAUTION
The connectors are keyed so that you can install the NVRAM
module with the correct orientation. Do not force the modules
into the connectors if the key in the module does not align
with the connector.
6. Repeat the procedures in step 5 for the second NVRAM module, and
install it into the other connector of the same bank.
7. Reassemble the system unit.
8. Run the diagnostic tests (Chapter 3) to make sure that the NVRAM
module is operating correctly.

3
Operation
This chapter describes how to run the power-up self-test and interpret
its results. It also describes the commands used for the operation of the
PrestoServe/NVRAM option and how to move the NVRAM modules.

3.1 Running the Power-Up Self-Test
The power-up self-test checks each component, subsystem, and connection
in the system.
To run the power-up self-test, turn the system unit’s power switch on ( | ).
Figure 3–1 shows the location of the system unit on/off switch.
Power On/Off Switch

Captive Cover
Screws

RE_EN05169A_90
LJ-00440-TI0

Figure 3–1

Location of On/Off Switch

3–1

3–2 Operation

The system begins to build a power-up self-test display on the console
terminal. Example 3–1 shows the power-up self-test display when it
completes successfully.
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14.. 1
13..12..11..10..9..8..7..6..5..4..3..
KN230 Vn.n 2
08-00-2b-55-55-55 3
0x1000000 4
>> 5

Example 3–1

Successful Power-Up Self-Test Display

Tests or groups of tests on specific system functions

The version of the system module console program –
The V indicates that this is an official release of the product. The
digits n.n indicate the release number.

The Ethernet address of the system

The memory size in hexadecimal format –
Table 3–1 shows the values for the various memory configurations.

Table 3–1 Memory Size Indication
Hexadecimal Value

Memory Size
in Megabytes

0x800000

0x1000000

0x1800000

0x2000000

0x2800000

0x3000000

0x4000000

0x4800000

0x6000000

Operation 3–3

The console prompt –
If security is enabled and a valid password exists, the following
prompt will appear on the console: S>
Refer to the DECsystem 5100 Operator’s Guide for a description of the
console security features.

Example 3–2 shows the power-up self-test display if the system detects
memory errors.
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14..
13..12..11..10..9..8..7..6..5..4..3..
KN230 Vn.n
08-00-2b-55-55-55
0x1000000
Bad mem: 0x1400
>>

Example 3–2
1

Power-Up Self-Test Display with Memory Error

A message to indicate that some bad memory exists but the system
may still be operable.

3.1.1 Unsuccessful Power-Up Self-Test
If during the power-up self-test, one of the individual tests fails, the
system halts and displays an error report summary. When one or both
of the NVRAM modules fail the power-up diagnostics, the following error
report summary is displayed on the console terminal. Example 3–3
shows a typical error report summary resulting from the failure of test
group 4. An error report summary contains five elements of diagnostic
information.

3–4 Operation

26..25..24..23..22..21..20..19..18..17..16..15..14..14..14.. 1
13..12..11..10..09..08..07..06..05..04..
?09 06 ff 0001 2
P1= ffffffff P2= a3400044 P3= a3400044 P4= 00000000 P5= 00000000 3
P6= 00000000 P7= 00000000 P8= 00000000 P9= 00000000 P10=00000000 3
gp= 34e6d146 sp= a000f794 fp= 00000000 sr= 04800000 3
3
epc=bfc2a1f0 badvaddr=00060000 cause=1000000
03.. 4
>> 5

Example 3–3

Unsuccessful Power-Up Self-Test Example

Power-up self-test in progress.

The number after the question mark (?) indicates which test failed.
(In Example 3–3, test 09 failed.)

Four-line error report summary on the failing test, test 0x9 (NVRAM
test).

The power-up self-test continuing after error.

The console prompt –
If security is enabled and a valid password exists, the following
prompt will appear on the console: S>

3.1.2 Interpreting the Power-Up Self-Test Results
For information concerning power-up self-test failures, refer to the
DECsystem 5100 Maintenance Guide.

Operation 3–5

3.2 Commands
The following section describes the console commands related to the
PrestoServe/NVRAM option.
NOTE
Note that the command interpreter is case-sensitive and, as a rule,
lowercase is used.

3.2.1 Configuration Command
The configuration (conf) command displays the system configuration. The
format of this command is shown here:
conf [-(b | f | m | s | g)]
The -b option directs the system to display a brief system configuration.
Example 3–4 shows an example of a brief system configuration display.
>> conf -b
hardware: revision 1
firmware: revision 4
Ethernet hardware address: 08-00-2b-12-7f-58
option board: not present
dynamic memory: total size 8MBs
non-volatile memory: 1 MBs at 0xa0c00000
scsi peripherals
unit type
product
removable/fixed
0 tape
TLZ04 1989(C) DEC removable
1 disk
RZ56
(C) DEC fixed
2 disk
RZ23
(C) DEC fixed
3 disk
RZ24
(C) DEC fixed
4 cdrom
CD-ROM CDU-541
removable
5 tape
TZK10
removable
6 disk
RZ23
(C) DEC fixed
7 host adapter
>>

Example 3–4

Brief System Configuration Display

3–6 Operation

The -f option directs the system to display a full system configuration
table. Example 3–5 shows an example of a full system configuration
display.
>> conf -f
hardware: revision 1
firmware: revision 4
cpu: revision 2.32
fpu: revision 3.32
security switch: secure mode
password: clear
eeprom: valid
Ethernet hardware address: 08-00-2b-12-7f-58
option board: not present
dynamic memory: total size 8MBs
bank0
4MB SIMMs size: 8MBs
0 bad pages
non-volatile memory: 1 MBs at 0xa0c00000
scsi peripherals
unit type
product
removable/fixed
0 tape
TLZ04 1989 (C)DEC removable
1 disk
RZ56
(C) DEC fixed
2 disk
RZ23
(C) DEC fixed
3 disk
RZ24
(C) DEC fixed
4 cdrom
CD-ROM CDU-541
removable
5 tape
TZK10
removable
6 disk
RZ23
(C) DEC fixed
7 host adapter
>>

Example 3–5

Full System Configuration Display

capacity
634 MBs
100 MBs
200 MBs
571 MBs
100 MBs

Operation 3–7

The -m option directs the system to display the memory configuration.
Example 3–6 shows an example of a memory configuration display.
>> conf -m
dynamic memory: total size 8MBs
bank0 4MB SIMMs size: 8MBs
0 bad pages
non-volatile memory: 1 MBs at 0xa0c00000
>>

Example 3–6

Memory Configuration Display

The -s option directs the system to display a table of the SCSI devices in
the system. Example 3–7 shows an example of a SCSI device table.
>> conf -s
scsi peripherals
unit type
0 tape
1 disk
2 disk
3 disk
4 cdrom
5 tape
6 disk
7 host adapter

product
TLZ04 1989 (C)DEC
RZ56
(C) DEC
RZ23
(C) DEC
RZ24
(C) DEC
CD-ROM CDU-541
TZK10
RZ23
(C) DEC

Example 3–7

SCSI Device Table

removable/fixed
removable
fixed
fixed
fixed
removable
removable
fixed

capacity
634 MBs
100 MBs
200 MBs
571 MBs
100 MBs

3–8 Operation

The -g option directs the system to display a general system configuration.
Example 3–8 shows an example of a general system configuration display.
>> conf -g
hardware: revision 1
firmware: revision 4
Ethernet hardware address: 08-00-2b-12-7f-58
option board: not present
dynamic memory: total size 8MBs
non-volatile memory: 1 MBs at 0xa0c00000

Example 3–8

General System Configuration Display

3.3 Using the prcache Console Command
The prcache command is part of the system firmware’s privileged
console commands. Use this command to diagnose problems, to obtain
information about the cache configuration, and to perform maintenance
operations on the PrestoServe/NVRAM option. The prcache command is
executed from the console prompt (>>).
NOTE
The PrestoServe/NVRAM option is diagnosed during the power-up
self-tests. It can also be diagnosed by using the extended self-test
commands. Refer to Chapter 4 for more information.
The syntax for the prcache console command is:
prcache -f
prcache -u
prcache -z
•

The prcache -f command shows the status of the PrestoServe/NVRAM
option. It displays information about the cache size, starting address,
system ID, state (either clean or dirty), and battery status.

•

The prcache -u command enables the PrestoServe/NVRAM option
batteries by unarming the battery disconnect circuits.

•

The prcache -z command clears the PrestoServe/NVRAM option cache
and disables the NVRAM modules’ batteries by arming the battery
disconnect circuits. The command issues a prompt which asks you if
the cache is cleared.

Operation 3–9

The following example of the prcache -f command shows that the
PrestoServe/NVRAM option contains valid data (dirty) and that the
batteries are enabled:
>> prcache -f

Return

Nvram disk cache: 1 MBs at 0xa3400000
Nvram disk cache ID is Ox127ed2
Nvram disk cache is dirty
Rear nvram SIMM battery okay
Rear nvram SIMM battery disconnect circuit un-armed
Front nvram SIMM battery okay
Front nvram SIMM battery disconnect circuit un-armed
>>

The following example of the prcache -u command enables the batteries,
and the example of the prcache -f command shows that the cache is clean
and that the batteries are enabled:
CAUTION:
The prcache -u command connects the batteries to the cache.
Turning the system off when the batteries are connected, will
cause them to drain unnecessarily.
>> prcache -u
>> prcache -f

Return
Return

Nvram disk cache: 1 MBs at 0xa3400000
Nvram disk cache ID is Ox127ed2
Nvram disk cache is clean
Rear nvram SIMM battery okay
Rear nvram SIMM battery disconnect circuit un-armed
Front nvram SIMM battery okay
Front nvram SIMM battery disconnect circuit un-armed
>>

The following example of the prcache -z command clears the PrestoServe
/NVRAM option cache and disables the batteries. The example of the
prcache -f command shows that the cache does not contain valid data
(clean) and that the batteries are disabled.
>> prcache -z Return
Zero the nvram disk cache, are you sure (Y/N) [N]? Y

Return

3–10 Operation

>> prcache -f

Return

Nvram disk cache: 1 MBs at 0xa3400000
Nvram disk cache ID is Ox127ed2
Nvram disk cache is clean
Rear nvram SIMM battery okay
Rear nvram SIMM battery disconnect circuit armed
Front nvram SIMM battery okay
Front nvram SIMM battery disconnect circuit armed
>>

3.4 Moving the NVRAM Modules
When the PrestoServe/NVRAM option cache contains valid data, and
the NVRAM modules have been moved to another system, the power-up
diagnostics identify that the NVRAM modules were moved. The following
example shows the power-up diagnostic that is displayed:
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14..
13..12..11..10..09..08..07..06..05..04
?09 0a ff 0000
?rear nvram SIMM ID does not match system ID
?front nvram SIMM ID does not match system ID
KN230 Vn.n
08-00-2b-18-73-52
0x3000000
>>

When you boot the system and the PrestoServe/NVRAM option cache
contains valid data, the system gives you the following options:
•

Discard the PrestoServe/NVRAM option cache data.

•

Write the data to the intended disks.

•

Halt the machine.

Operation 3–11

If the PrestoServe/NVRAM option cache contains valid data, but the
NVRAM modules have been interchanged, the system cannot boot, and
the following information is displayed on the console terminal:
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14..
13..12..11..10..09..08..07..06..05..04
?09 0a ff 0000
?rear nvram SIMM ID does not match system ID
?front nvram SIMM ID does not match system ID
?rear nvram BOARD is in the wrong bank
?front nvram BOARD is in the wrong bank
03..
KN230 Vn.n
08-00-2b-18-73-52
0x3000000
>> boot Return
2..?booting not possible
?rear and front nvram SIMMs must be swapped
?rear nvram SIMM ID does not match system ID
?front nvram SIMM ID does not match system ID
?rear nvram BOARD is in the wrong bank
?front nvram BOARD is in the wrong bank
>>

You must move the NVRAM modules to their correct positions to recover
the cache data.
CAUTION:
Data loss could occur if you discard the data then proceed to boot
the operating system.
If you do not want the data in the PrestoServe/NVRAM option cache,
use the prcache -z command to discard the data. You can then boot the
system.

4
Troubleshooting
Before proceeding, the following guidelines should be followed:
•

Always observe electrostatic discharge (ESD) procedures when
handling modules.

•

When transferring NVRAM modules, always note their positions and
treat them as a pair.

4.1 Executing the PrestoServe/NVRAM Option
Diagnostic (test 0x9)
Use the following test command to execute the PrestoServe/NVRAM
option diagnostic (test 0x9):
>> test -v 0x9

When the PrestoServe/NVRAM option cache contains valid data (dirty),
then the limited read-only test is executed and it does not alter the
contents of the PrestoServe/NVRAM option cache. The diagnostic does
a read test on the PrestoServe/NVRAM option cache and uses a scratch
area for a write test.
When the PrestoServe/NVRAM option cache is clean, an extensive read
/write test is executed and the entire contents of the PrestoServe/NVRAM
option cache is altered. The diagnostic then performs data pattern tests
and address short tests. It also tests the battery disconnect circuitry by
disabling the circuits. The diagnostic then enables the battery disconnect
circuitry and checks the status register to ensure that the batteries are
disconnected.

4–1

4–2 Troubleshooting

Example 4–1 shows what is displayed after test 0x9 is executed and the
PrestoServe/NVRAM option cache is dirty (contains valid data).
>> test -v 0x9
-009-04 nvram float 1’s and 0’s tst
-009-05 wrt addr to addr
-009-06 chk nvram w/ addr -> 5’s
-009-07 chk nvram w/ 5’s -> A’s
-009-08 chk nvram w/ A’s -> F’s
-009-09 chk nvram w/ F’s
-009-0a nvram read-only tst
-009-0b tst nvram batt

Example 4–1 PrestoServe/NVRAM Option Cache is Dirty
(Contains Valid Data) - test 0x9
Example 4–2 shows what is displayed after test 0x9 is executed and the
PrestoServe/NVRAM option cache is clean (contains no data).
>> test -v 0x9
-009-04 nvram float 1’s and 0’s tst
-009-05 wrt addr to addr
-009-06 chk nvram w/ addr -> 5’s
-009-07 chk nvram w/ 5’s -> A’s
-009-08 chk nvram w/ A’s -> F’s
-009-09 chk nvram w/ F’s
-009-0b tst nvram batt
-009-0c tst nvram bat disc circuit

Example 4–2 PrestoServe/NVRAM Option Cache is Clean
(Contains No Data) - test 0x9

4.1.1 PrestoServe/NVRAM Option Installed but Not
Configured
If the PrestoServe/NVRAM option is installed but not configured, the
following message will be displayed after the prcache command is issued:
?nvram option not available

Check to see if the environment variable boot mode is set to "d". If it is,
at the console prompt in privileged mode type:
>> setenv bootmode *

Troubleshooting 4–3

Turn the system off (O), then turn the system back on ( | ). A power-up
diagnostic countdown should appear at the console terminal:
NOTE
The power-up diagnostics should configure the
PrestoServe/NVRAM option into the system.
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14..
13..12..11..10..09..08..07..06..05..04..03..
KN230 Vn.n
08-00-2b-18-73-52
0x3000000
>>

Use the prcache command to see if the PrestoServe/NVRAM option is
present. The following message will be displayed again if the PrestoServe
/NVRAM option is still not configured:
?nvram option not available

Check to see if the PrestoServe/NVRAM option is installed correctly. It
may have been installed in the wrong memory bank, or one or both of the
NVRAM modules may be faulty. Refer to Chapter 2 for a description of
how to install the PrestoServe/NVRAM option.

4.2 Handling Failed NVRAM Modules (FRU Part
Number 54-20474-01)
If one or both of the NVRAM modules fails the power-up diagnostics, the
following example will be displayed on the console terminal:
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14..
13..12..11..10..09..08..07..06..05..04..
?09 06 ff 0001
P1= ffffffff P2= a3400044 P3= a3400044 P4= 00000000 P5= 00000000
P6= 00000000 P7= 00000000 P8= 00000000 P9= 00000000 P10=00000000
gp= 34e6d146 SP= a000f794 fp= 00000000 sr= b0480000
epc=bfc2a1f0 badvaddr=00060000 cause=10000000
03..
KN230 Vn.n
08-00-2b-18-73-52
0x3000000
>>

4–4 Troubleshooting

Use the conf -m command to determine which modules (rear, front, or
both) are bad:
>> conf -m RETURN
dynamic memory: total size 48MBs
bank0 16MB SIMMs size: 32MBs
0 bad pages
bank1
4MB SIMMs size: 8MBs
0 bad pages
bank2
4MB SIMMs size: 8MBs
0 bad pages
non-volatile memory: 1 MBs at Oxa3400000
front SIMM: bad
rear SIMM: ok
>>

4.2.1 Disable Battery/Zero the PrestoServe/NVRAM Option
Cache
Before removing failed NVRAM modules, use the prcache -z command to
zero the PrestoServe/NVRAM option cache and disable the batteries.
>> prcache -z Return
Zero the nvram disk cache, are you sure (Y/N) [N]? Y

Return

Replace the failed NVRAM modules.
NOTE
When one or both NVRAM modules fail, NVRAM data is lost.
After the new NVRAM modules are installed, the following power-up
diagnostic is displayed:
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14..
13..12..11..10..09..08..07..06..05..04..03..
KN230 Vn.n
08-00-2b-18-73-52
0x3000000
>>

Troubleshooting 4–5

4.3 Recovering PrestoServe/NVRAM Option Cache
Data After Replacing the System Module
If the system powers down abnormally and fails to reboot, you may have
to replace the system module. Before removing any modules, note the
locations of the NVRAM and memory modules on the system. Then
transfer the NVRAM and memory modules to the same location on the
new system. After the new system module is installed, the following
power-up diagnostics are displayed:
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14..
13..12..11..10..09..08..07..06..05..04..
?09 0a ff 0000
?rear nvram SIMM ID does not match system ID
?front nvram SIMM ID does not match system ID
03..
KN230 Vn.n
08-00-2b-18-73-52
0x1800000
>>

Use the prcache -f command as follows to determine if the PrestoServe
/NVRAM option cache contains data:
>> prcache -f

Return

Nvram disk cache: 1 MBs at 0xa3400000
?rear nvram SIMM ID does not match system ID
?front nvram SIMM ID does not match system ID
Nvram disk cache is dirty
Rear nvram SIMM battery okay
Rear nvram SIMM battery disconnect circuit un-armed
Front nvram SIMM battery okay
Front nvram SIMM battery disconnect circuit un-armed
>>

When you boot the system and the PrestoServe/NVRAM option cache
contains data, the system gives you the following options:
•

Discard the PrestoServe/NVRAM option cache data.

•

Write the data to the intended disks.

•

Halt the machine.

Index
B
Battery
disabling battery, 4–4

C
Cables, 2–2
disconnecting, 2–2
panel power and signal cabling,
2–2
second modem cable removal, 2–4
Cache data
recovering, 4–5
Caution
meaning, viii
Commands, 3–4
configuration command, 3–5
prcache console commands, 3–8
prcache -f, 3–8
prcache -u, 3–9
prcache -z, 3–9
Configuration
brief system configuration
display, 3–5
configuration command, 3–5
full system configuration display,
3–6
general system configuration
display, 3–8
memory configuration display,
3–7
Configurations
memory and NVRAM, 2–6
MS44 information, 2–6

Console program
version, 3–2
Console prompt, 3–2

D
Diagnostic
executing, 4–1
Drive mounting panel
lower
device combination options,
2–4
release, 2–5
removal of, 2–4
power cabling, 2–2
signal cabling, 2–2
upper
release, 2–2
removal of, 2–2

E
Error report summary
example of, 3–3
Ethernet
address, 3–2

F
Field replaceable unit
see FRU, 2–1
FRU
defined, 2–1
list, 2–1
locations, 2–1

Index 1

2 Index

FRU (Cont.)
section references, 2–1

P
I
Installation
before you begin, 2–1
of the NVRAM module, 2–1, 2–10

L
Lower drive mounting panel
see Drive mounting panel, 2–4

M
Memory
indication of size, 3–2
Modules
handling failed, 4–3
zeroing NVRAM Modules, 4–4
using prcache -f command,
4–4
using prcache -z command,
4–4

N
Note
meaning, viii
NVRAM diagnostic
executing, 4–1
NVRAM modules
moving, 3–10

Power
panel power and signal cabling,
2–2
Power-up self-test
defined, 3–1
errors, 3–4
interpreting results, 3–4
running, 3–1, 3–4
successful display, 3–2
test 09, 3–4
unsuccessful display, 3–3
PrestoServe modules
moving, 3–10
PrestoServe/NVRAM option
description, 1–1

R
Recovering cache data, 4–5

S
System, turning on, 3–1
System configuration
display of, 3–5
System on/off switch
location, 3–1
System on/off switch location, 2–2
System unit cover
removal, 2–1

T
O
Operation
executing power-up self-test, 3–1
Ordering information, 1–1

Test 09
running power-up self-test, 3–4
Test results
interpreting, 3–4
Troubleshooting
using power-up self-test results,
3–4

Index 3

U
Upper drive mounting panel
see Drive mounting panel, 2–2