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EK-350SA-UG-001

October 1992

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Document:	BA350-SA Modular Storage Shelf User's Guide
Order Number:	EK-350SA-UG
Revision:	001
Pages:	24
Original Filename:	https://manx-docs.org/collections/mds-199909/cd3/storage/350saug1.pdf

OCR Text

BA350–SA
Modular Storage Shelf
User’s Guide
Order Number: EK–350SA–UG–001
This manual describes the BA350–SA storage shelf and the rules for
configuring the shelf to include power, system building blocks (SBBs),
device addressing, and SCSI buses. Procedures for determining shelf
status and replacing blowers are also included.

Digital Equipment Corporation
Maynard, Massachusetts

First Edition: October 1992
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 1992
Printed in U.S.A.
All Rights Reserved.
The postpaid READER’S COMMENTS card requests the user’s critical evaluation to assist in
preparing future documentation.
FCC NOTICE: The equipment described in this manual generates, uses, and may emit radio
frequency energy. The equipment has been type tested and found to comply with the limits for
a Class A computing device pursuant to Subpart G of Part 15 of FCC Rules, which are designed
to provide reasonable protection against such radio frequency interference when operated in a
commercial environment. Operation of this equipment in a residential area may cause interference,
in which case the user at his own expense may be required to take measures to correct the
interference.
AXP, DEC, DEC 10000, MicroVAX, RZ, VAXserver, and the DIGITAL logo are trademarks of Digital
Equipment Corporation.

This document was prepared using VAX DOCUMENT, Version 2.0.

Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 Introducing the BA350–SA Shelf
1.1
1.2
1.2.1
1.2.2
1.3
1.4

BA350–SA Modular Storage Shelf Description . . . . . . . . . . . . . . . . . . . . . .
Shelf Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SHELF_OK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing SBBs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Blowers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1
1–2
1–2
1–4
1–5
1–6

2 Configuring the BA350–SA Shelf
2.1
2.2
2.3

Power Configuration Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SBB Configuration Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SBB Device Addressing Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1
2–1
2–2

3 BA350–SA Shelf SCSI Buses
3.1
3.1.1
3.1.2
3.1.3

SCSI Bus Configuration Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring a BA350–SA Shelf for Single SCSI Bus . . . . . . . . . . . . . .
Configuring a BA350–SA Shelf for Two SCSI Buses . . . . . . . . . . . . . .
Configuring Multiple BA350–SA Shelves for a Single SCSI Bus . . . . .

3–1
3–2
3–3
3–4

BA350–SA Modular Storage Shelf — Front View . . . . . . . . . . . . . . . . .
Power Supply LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SHELF_OK Signal Jumper W1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing an SBB from the Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Blowers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SBB Device Address Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BA350–SA SCSI Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single BA350–SA SCSI Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BA350–SA SCSI Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single SCSI Bus on Two BA350–SA Shelves . . . . . . . . . . . . . . . . . . . .

1–1
1–3
1–4
1–6
1–7
2–4
3–1
3–2
3–3
3–4

Index
Figures
1–1
1–2
1–3
1–4
1–5
2–1
3–1
3–2
3–3
3–4

iii

Tables
1–1
2–1

BA350 DECstor/me Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECstor/me SBB Address Switch Settings . . . . . . . . . . . . . . . . . . . . .

1–2
2–3

Preface
The BA350–SA Modular Storage Shelf User’s Guide describes how to configure
the BA350–SA shelf, and install and replace DECstor/me components.
Note
Shelf installation procedures are cabinet specific and are not included in
this manual.

Intended Audience
This manual is intended for use by personnel configuring, using, and installing
BA350 DECstor/me modular storage shelf subsystems.

Structure
This manual is organized as follows:
Chapter 1

Provides a description of the BA350–SA storage shelf including
components, status signals, and replacement procedures.

Chapter 2

Provides shelf-specific configuration rules for power, storage system
building blocks (SBBs), shelves, and device addressing.

Chapter 3

Provides a detailed description of shelf-specific SCSI buses including
terminators, jumpers, and devices by bus and location.

Related Documents
The following table lists documents (alphabetically by title) that contain
information related to this product:
Document Title

Order Number

BA350 Modular Storage Shelf Subsystem Configuration Guide

EK–BA350–CG

BA350 Modular Storage Shelf Subsystem User’s Guide

EK–BA350–UG

BA35X–VA Vertical Mounting Kit User’s Guide

EK–350SV–UG

BA350–EA Modular Storage Shelf User’s Guide

EK–350EA–UG

BA350–LA Modular Storage Shelf User’s Guide

EK–350LA–UG

BA655 SCSI Disk and Tape PIU Installation Guide

EK-BA655-IN

Installation Notice—RZ73 Bus Termination and Jumper
Installation Guide

EK–RZ73X–IS

MicroVAX/VAXserver 3100 and DECsystem 5100 RZ25
Installation Guide Addendum

EK–RZ2MV–AD

RZ Series Disk Drive Reference Manual

EK–RZXXD–RM

RZ22, RZ23, RZ24 Disk Drive Subsystem Service Manual

EK–RZ234–SV

RZ24 Hard Disk Drive Installation Guide

EK–RZ24I–IS

RZ25–S Mounting Bolt/Bracket Installation Instructions

EK–RZ25S–IN

RZ2x Hard Disk Drive Upgrade Installation Instructions

EK–RZ2XH–UG

RZ2x Series Drive Bracket Installation Sheet

EK–RZ2XD–UG

TLZ06 Cassette Tape Drive Installation Guide

EK–STEXP–AD

TLZ06 Cassette Tape Drive Owner’s Manual

EK–TLZ06–OM

Documentation Conventions
The following conventions are used in this manual:

boldface type

Boldface type indicates the first instance of terms being defined in text,
in the glossary, or both.

italic type

Italic type indicates emphasis and complete manual titles. In the
glossary, italic type is also used to indicate cross-references.

1
Introducing the BA350–SA Shelf
This manual describes the BA350–SA modular storage shelf including
configuration rules, system building blocks (SBBs)1 , shelf status, power, blowers,
and SCSI buses.
Note
The procedures for installing this shelf, routing cables, and connecting
cables are unique to each cabinet type and are described in the
cabinet-specific manuals.

1.1 BA350–SA Modular Storage Shelf Description
The BA350–SA shelf shown in Figure 1–1 has a SCSI cable slot and eight SBB
slots.
Figure 1–1 BA350–SA Modular Storage Shelf — Front View

CXO-3617A-PH

•

The SBB slots are numbered 0 through 7 from right to left. For a vertically
mounted shelf, the slots are numbered from top to bottom.

•

The seven available device addresses (that is, target IDs) are 0 through 6 and
can be used for either 3½-inch or 5¼-inch SBBs. The shelf slot numbers and
the device addresses are the same.

SBBs are devices mounted in either a 3½-inch or 5¼-inch modular carrier, including
disk drives, tape drives, CDROMs, static storage devices, power supplies, adapters,
CPUs, and so on.

Introducing the BA350–SA Shelf 1–1

Introducing the BA350–SA Shelf
1.1 BA350–SA Modular Storage Shelf Description
•

Slot 6 can be used for either a storage SBB, a redundant power supply SBB
(either ac or dc), or a battery backup unit (BBU) SBB.

•

Slot 7 is always used for the primary power supply. This supply can be either
an ac or dc supply, depending upon the cabinet in which the shelf is installed.

•

The BA350–SA shelf can be installed in any cabinet that has an ac
distribution unit or dc power system that is compatible with the DECstor/me
power supplies.
WARNING
Service procedures described in this manual that involve blower removal
or access to the rear of the shelf must be performed only by qualified
service personnel.

Table 1–1 lists the DECstor/me products that can be used with a BA350–SA shelf.

Table 1–1 BA350 DECstor/me Products
DECstor/me Product
BA35X–HA ac power supply
BA35X–HB dc power supply
BA35X–HC battery backup unit (BBU)
3½-inch SBB
5¼-inch SBB1
SCSI buses
BA35X–MA blower
BA35X–MB SCSI terminator board
BA35X–MC SCSI jumper board
BA35X–PA filler panel kit2
BA35X–xx mounting bracket kit3
1

This SBB requires three slots.

This kit contains six 3½-inch blank SBB bezels.

This kit is cabinet-specific.

Min

Max

1
1
0
0
0
1
2
1
0
0
1

2
2
1
7
2
2
2
1
1
1
1

1.2 Shelf Status
Two conditions are monitored for the shelf: cooling and power. The cabinet
provides the cooling and the shelf power supply provides the +5 Vdc +12 Vdc to
operate the SBBs. When there is an overtemperature condition or a power supply
failure, the status is reported to the host or controller and is indicated to the user
by the illumination of one or both of the power supply LEDs.

1.2.1 Power Supply LEDs
The power supply is shown in Figure 1–2. There are two status LEDs on the
front of the power supply:
•

The upper LED indicates the shelf status.

•

The lower LED indicates the power supply status.

1–2 Introducing the BA350–SA Shelf

Introducing the BA350–SA Shelf
1.2 Shelf Status
Depending on whether or not either or both of the LEDs are lit indicates one of
the following conditions:
•

When the shelf status (upper) LED is on and the power supply status (lower)
LED is on, the temperature is within the proper operating range and the
power supplies are functioning properly.

•

When the shelf status (upper) LED is off and the power supply status (lower)
LED is on, there is an overtemperature condition.

•

When both the shelf status (upper) LED and the power supply status (lower)
LED are off, either the power supply is defective or the input voltage is
incorrect.

Figure 1–2 Power Supply LEDs

SHELF
STATUS LED

POWER SUPPLY
STATUS LED

CXO-3613A-PH

Introducing the BA350–SA Shelf 1–3

Introducing the BA350–SA Shelf
1.2 Shelf Status
1.2.2 SHELF_OK Signal
The shelf status (SHELF_OK) is reported to the host or controller that can
process this information. However, since not all hosts and controllers can process
this signal, this signal is sent to a compatible host or controller by installing
jumper W1 on both the terminator board (BA35X–MB) and the jumper board
(BA35X–MC) on each shelf, as shown in Figure 1–3.
Figure 1–3 SHELF_OK Signal Jumper W1

W1
W1

TERMINATOR

JUMPER
CXO-3636A-MC

1–4 Introducing the BA350–SA Shelf

Introducing the BA350–SA Shelf
1.3 Replacing SBBs

1.3 Replacing SBBs
There are three methods for replacing SBBs, including power supplies—hot swap,
warm swap, and cold swap. A full description of these procedures is contained in
the BA350 Modular Storage Shelf Subsystem User’s Guide.
CAUTION
To prevent electrostatic discharge (ESD) damage to an SBB, do not touch
the SBB connector.

In each case, you use the LEDs on the front of the SBB to determine which SBBs
are operational and which have failed.
•

Use the hot swap method only when there are two dc power supplies in a
shelf. You can remove the failed power supply while the other furnishes the
power.
CAUTION
When removing or replacing an SBB, always use both hands to support
the weight of the SBB.

For storage SBBs, you can use the hot swap method provided that the green
status LED is off, indicating the unit is not being accessed.
•

Use the warm swap method when there are multiple shelves in a cabinet and
it is necessary to remove power from a particular shelf because the power
supply has failed. When this is case, none of the devices on that shelf are
operational until the replacement supply is installed.

•

Use the cold swap method when input power is removed from all shelves in
an cabinet by turning off power at the power controller. This normally only
occurs during initial installation. None of the shelves are operational until
the input power is restored.

To remove or replace an SBB, use the following procedure:
Step

Procedure

Press the two mounting tabs (as shown in Figure 1–4) to release the SBB and pull
the SBB out of the shelf.

Insert the replacement SBB into the guide slots and push it in until the tabs lock
in place.

Introducing the BA350–SA Shelf 1–5

Introducing the BA350–SA Shelf
1.3 Replacing SBBs
Figure 1–4 Removing an SBB from the Shelf

CXO-3611A-PH

1.4 Replacing Blowers
Each BA350–SA shelf has two blowers mounted on the rear of the shelf.
Connectors on the backplane provide the +12 Vdc of power to operate the blowers.
As long as one blower is operational on each shelf, there is sufficient air flow to
prevent an overtemperature condition. When either blower fails, the shelf status
(upper) LED on the power SBB lights, and an error message is passed to the
controller or host.
WARNING
Service procedures described in this manual that involve blower removal
or access to the rear of the shelf must be performed only by qualified
service personnel.
To reduce the risk of electrical energy hazard, disconnect the power cables
from the shelf power SBBs before removing shelf blower assemblies or
performing service in the backplane area, such as modifying the SCSI
bus.

When a blower is removed, the change in the air flow pattern reduces the cooling
to the point that the shelf can overheat within 60 seconds.
To replace a blower, use the following procedure:
Note
Replacing a blower requires access to the rear of the shelf. If the rear of
the shelf is not accessible, turn off the power, remove the shelf from the
cabinet, and perform steps 1 through 6. Then replace the shelf in the
cabinet and apply power.

1–6 Introducing the BA350–SA Shelf

Introducing the BA350–SA Shelf
1.4 Replacing Blowers

Step

Procedure

Disconnect all power cables to shelf power SBBs.

Use a Phillips screwdriver to remove the safety screw in the upper right corner of
the blower.

As shown in Figure 1–5, press the upper and lower blower mounting tabs in to
release the blower.

Pull the blower straight out to disconnect it from the shelf power connector.

Align the replacement blower connector and insert the module, straight in, making
sure that both mounting tabs lock in place.

Replace the safety screw in the upper right corner of the blower.

Connect the shelf power cables and verify that the shelf and all SBBs are operating
properly.

Figure 1–5 Replacing Blowers

CXO-3515A-PH

Introducing the BA350–SA Shelf 1–7

2
Configuring the BA350–SA Shelf
This chapter describes the rules for configuring a BA350–SA modular storage
shelf including power, system building blocks (SBBs), and device addresses.
Note
The configuration rules in the following sections have precedence over
those listed in the BA350 Modular Storage Shelf Subsystem User’s Guide.

2.1 Power Configuration Rules
Use the following rules to configure the power for a BA350–SA modular storage
shelf:
•

Each BA350–SA shelf requires either an ac or dc primary power supply based
upon the cabinet power distribution unit.

•

The primary power supply is installed in slot 7 (power slot).

•

When slot 6 does not contain a storage SBB, either of the following can be
installed:
–

An optional redundant power supply

–

An optional battery backup unit (BBU)

2.2 SBB Configuration Rules
Use the following rules to configure the SBBs (disk drives, tape drives, and so
forth) in the BA350–SA shelf:
•

The Digital storage devices available for use in the BA350–SA shelf are listed
in BA350 Modular Storage Shelf Subsystem Configuration Guide.

•

The maximum number of SBBs you can install in a BA350–SA modular
storage shelf is determined by:
— The SBB physical size (either 3½-inch or 5¼-inch)
— The bus configuration

•

Software control signals on the SCSI bus are required to ensure that the disk
drives on each shelf spin up sequentially.

Configuring the BA350–SA Shelf 2–1

Configuring the BA350–SA Shelf
2.2 SBB Configuration Rules
•

The sequence for installing storage SBBs is normally determined by the
SCSI bus configuration. However, when installing SBBs in a BA350–SA shelf
installed in a BA35X–VA vertical mounting kit, the installation sequence is as
follows:
Slot 5
Slot 4
Slot 3
Slot 2
Slot 1
Slot 0
CAUTION
To prevent electrostatic discharge (ESD) damage to an SBB, do not touch
the SBB connector.

2.3 SBB Device Addressing Rules
Use the following rules to assign device addresses to the SBBs (disk drives, tape
drives, and so forth) in a DECstor/me shelf:
CAUTION
Each device address on a SCSI bus or DECstor/me storage shelf can only
be used once.

•

The maximum number of device addresses per SCSI bus or DECstor/me
modular storage shelf is seven.

•

The SBB device address is determined automatically by its physical location
in the shelf unless the SBB has a device address switch.
Note
Unless specifically stated otherwise, DECstor/me modular storage shelf
slot numbers and SCSI addresses are the same.

•

The 3½-inch tape drive SBBs and all 5¼-inch SBBs have a six-bit address
switch located on the rear of the SBB as shown in Figure 2–1. With this
switch you can select a SCSI address in the range 0 through 7. Table 2–1
lists the valid device address switch positions.

•

Setting the switch to automatic, as described in Table 2–1, enables the
automatic addressing mode which uses the physical position of the SBB to
determine the address.

•

When there is no address switch or you set the switch to automatic, the SBB
connector position determines the SCSI device address. For example,
–

If the SBB connector is in slot 5, the device address is 5.

–

If the SBB connector is in slot 3, the device address is 3.

2–2 Configuring the BA350–SA Shelf

Configuring the BA350–SA Shelf
2.3 SBB Device Addressing Rules
•

The address switch for a 5¼-inch full-height (FH) SBB is mounted adjacent to
the center SBB connector.

•

The address switch for the lower 5¼-inch half-height (HH) SBB is mounted
adjacent to the center SBB connector.

•

The address switch for the upper 5¼-inch HH SBB is mounted adjacent to
the left SBB connector.

Table 2–1 DECstor/me SBB Address Switch Settings
SCSI Switch Number

SCSI address 0
SCSI address 1
SCSI address 2
SCSI address 3
SCSI address 4
SCSI address 5
SCSI address 6
SCSI address 71
Automatic
1

Off
On
Off
On
Off
On
Off
On
Off

Off
Off
On
On
Off
Off
On
On
Off

Off
Off
Off
Off
On
On
On
On
Off

Off
Off
Off
Off
Off
Off
Off
Off
On

SCSI address 7 is generally reserved for the host.

Configuring the BA350–SA Shelf 2–3

Configuring the BA350–SA Shelf
2.3 SBB Device Addressing Rules
Figure 2–1 SBB Device Address Switch
5 1/4" SBB

3 1/2" SBB
B

A
B

1
2
3
4
5
6
OFF

ON
CXO-3630A-MC

2–4 Configuring the BA350–SA Shelf

3
BA350–SA Shelf SCSI Buses
This chapter describes the BA350–SA modular storage shelf SCSI buses including
terminators, jumpers, and component locations.
WARNING
Service procedures described in this manual, involving blower removal or
access to the rear of the shelf must be performed only by qualified service
personnel.
To reduce the risk of electrical energy hazard, disconnect the power cables
from the shelf power supplies before removing shelf blower assemblies
or performing service in the backplane area, such as modifying the SCSI
bus.

3.1 SCSI Bus Configuration Rules
Use the following rules to configure the BA350–SA shelf SCSI buses:
•

As shown in Figure 3–1, the BA350–SA has two single-ended SCSI bus
connectors mounted at the right end.

Figure 3–1 BA350–SA SCSI Buses
T

POWER

3-DEVICE BUS INPUT
4-DEVICE BUS INPUT
6

0
CXO-3597A-MC

POWER

7-DEVICE BUS INPUT

0
CXO-3596A-MC

•

Each bus requires a terminator. The terminator (T) and jumper (J) connectors
are mounted on the rear of the backplane.

BA350–SA Shelf SCSI Buses

3–1

BA350–SA Shelf SCSI Buses
3.1 SCSI Bus Configuration Rules
•

The BA350–SA shelf SCSI buses are configured prior to shipment as
either a four-SBB bus and a three-SBB bus, or a seven-SBB bus. (Refer
to Figure 3–1.) The configuration installed is determined by the customer’s
requirements.

•

Customers can configure buses provided that the rules listed in the following
sections are strictly observed. For a complete listing of compatible SCSI
cables, see the BA350 Modular Storage Shelf Subsystem User’s Guide.

•

Each device address on a SCSI bus can only be used once.

3.1.1 Configuring a BA350–SA Shelf for Single SCSI Bus
To configure the BA350–SA shelf for a single SCSI bus, as shown in Figure 3–2,
use the following procedure:
Step

Procedure

Turn off the shelf power by disconnecting the power cable from the shelf power
supplies.

Discharge any static buildup by momentarily touching a finger to a blank space on
the backplane.

Install the BA35X–MC jumper board in the backplane connector behind slot 5.

Install the BA35X–MB terminator board in the backplane connector behind slot 1.

Connect the SCSI cable to the upper connector.

Turn on the power and verify that all the devices are active.

Figure 3–2 Single BA350–SA SCSI Buses
J

POWER

7-DEVICE BUS INPUT

0
CXO-3596A-MC

3–2 BA350–SA Shelf SCSI Buses

BA350–SA Shelf SCSI Buses
3.1 SCSI Bus Configuration Rules
3.1.2 Configuring a BA350–SA Shelf for Two SCSI Buses
To configure the BA350–SA shelf for two SCSI buses, as shown in Figure 3–3, use
the following procedure:
Step

Procedure

Turn off the shelf power by disconnecting the power cable from the shelf power
SBBs.

Discharge any static buildup by momentarily touching a finger to a blank space on
the backplane.

Install the BA35X–MB terminator board in the backplane connector behind slot 5.

Install the unused BA35X–MC jumper board in the backplane connector behind
slot 1.

Connect the SCSI cable for device addresses 0, 2, and 4 to the upper connector.

Connect the SCSI cable for device addresses 1, 3, 5, and 6 to the lower connector.

Turn on the power and verify that all the devices are active.

Figure 3–3 BA350–SA SCSI Buses
T

POWER

3-DEVICE BUS INPUT
4-DEVICE BUS INPUT
6

0
CXO-3597A-MC

BA350–SA Shelf SCSI Buses

3–3

BA350–SA Shelf SCSI Buses
3.1 SCSI Bus Configuration Rules
3.1.3 Configuring Multiple BA350–SA Shelves for a Single SCSI Bus
To configure two BA350–SA shelves as a single SCSI bus, as shown in Figure 3–4,
use the following procedure:
Note
The maximum number of BA350–LA shelves on a single SCSI bus is two.
A maximum of seven storage SBBs can be installed in both shelves.

Step

Procedure

Turn off the shelf power by disconnecting the power cable from the shelf power
SBBs.

Discharge any static buildup by momentarily touching a finger to a blank space on
the backplane.

On the upper shelf, install the BA35X–MC jumper board in the backplane
connector behind slot 5.

On the lower shelf, install the BA35X–MC jumper board in the backplane
connector behind slot 5.

On the lower shelf, install the BA35X–MB terminator board in the backplane
connector behind slot 1.

Connect a BN21H-0E SCSI cable between the lower connector on the upper shelf
and the upper connector on the lower shelf.

Ensure that each device has a different SCSI bus address.

Turn on the power and verify that all the devices are active.

Figure 3–4 Single SCSI Bus on Two BA350–SA Shelves
J
7-DEVICE BUS INPUT

POWER

SHELF 1

OUT
IN

POWER

SHELF 2

0
T

0
CXO-3598A-MC

3–4 BA350–SA Shelf SCSI Buses

Index
C
Configuration rules
multiple BA350–LA shelves, 3–4
power supply, 2–1
SBBs, 2–1
SCSI bus, 3–1
single SCSI bus, 3–2
single SCSI bus, multiple shelves, 3–4
two SCSI buses, 3–3

SCSI bus configuration, single bus, multiple
shelves
procedure, 3–4
SCSI bus configuration, two buses
procedure, 3–3
Shelf status
power supply LEDs, 1–2
Shelf Status, 1–2
SHELF_OK status signal, 1–4
SSB
definition, 1–1

D
DECstor/me products used with the BA350–SA
shelf, 1–2
Description, 1–1
SCSI bus, 3–1
SHELF_OK status signal, 1–4

P
Power supply
configuration rules, 2–1

R
Related documents, vi
Removing SSBs
procedure for, 1–5
Replacing blowers, 1–6
procedure for, 1–6
Replacing SSBs, 1–5
cold swap method, 1–5
hot swap method, 1–5
procedure for, 1–5
warm swap method, 1–5

S
SBBs
configuration rules, 2–1
SCSI bus
configuration rules, 3–1
description, 3–1
SCSI bus configuration, single bus
procedure, 3–2

Index–1