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EK-350MA-UG-A02

July 1993

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Document:	StorageWorks Family, BA350-MA Controller Shelf User's Guide
Order Number:	EK-350MA-UG
Revision:	A02
Pages:	42
Original Filename:

OCR Text

StorageWorks Family
BA350–MA Controller Shelf
User’s Guide
Order Number: EK–350MA–UG. A02
This manual describes the BA350–MA StorageWorks controller shelf
and the rules for configuring the shelf and its associated power supplies,
device addresses, and SCSI buses. Procedures for replacing power
supplies, blowers, and shelves are also described.

Digital Equipment Corporation
Maynard, Massachusetts

July 1993
While Digital believes the information included in this publication is correct as of the date of
publication, it is subject to change without notice.
Digital Equipment Corporation makes no representations that the interconnection of its products
in the manner described in this document will not infringe existing or future patent rights, nor
do the descriptions contained in this document imply the granting of licenses to make, use, or sell
equipment or software in accordance with the description.
© Digital Equipment Corporation 1992, 1993.
All Rights Reserved.
Printed in the United States of America.
NOTE: This equipment 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 digital device pursuant to Part
15 of the FCC rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation.
Any changes or modifications made to this equipment may void the user’s authority to operate the
equipment.
Operation of this equipment in a residential area may cause interference in which case the user
at his own expense will be required to take whatever measures may be required to correct the
interference.
DEC, RZ, StorageWorks, and the DIGITAL logo are trademarks of Digital Equipment Corporation.
The postpaid READER’S COMMENTS card requests the user’s critical evaluation to assist in
preparing future documentation.

This document was prepared using VAX DOCUMENT, Version 2.1.

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

Manufacturer’s Declarations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 Introducing the BA350–MA StorageWorks Controller Shelf
1.1
1.2

Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BA350–MA Controller Shelf Products . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1
1–4

2 Configuration Rules
2.1
2.2
2.3

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

2–1
2–1
2–2

3 SCSI Bus Configurations
3.1
3.2
3.3
3.4
3.4.1
3.4.2
3.4.3
3.4.4

SCSI Bus Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calculating the SCSI Bus Length for a Single SBB Shelf . . . . . . . . . . . . .
Calculating the SCSI Bus Length for Multiple SBB Shelves . . . . . . . . . . .
Configuring SCSI Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3½-Inch SBB SCSI Bus Configurations . . . . . . . . . . . . . . . . . . . . . . . .
6x1 to 6x3 3½-Inch Bus Configurations . . . . . . . . . . . . . . . . . . . . . . . .
6x1 to 6x7 3½-Inch Bus Configurations . . . . . . . . . . . . . . . . . . . . . . . .
5¼-Inch Bus Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1
3–2
3–2
3–4
3–5
3–6
3–8
3–10

4 Replacement Procedures
4.1
4.2
4.3
4.3.1
4.3.2

Replacing a Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing a Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing a StorageWorks Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing a Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing a Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–2
4–4
4–6
4–6
4–6

Glossary

iii

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

BA350–MA StorageWorks Controller Shelf . . . . . . . . . . . . . . . . . . . . .
BA350–MA Controller Shelf Layout . . . . . . . . . . . . . . . . . . . . . . . . . .
Shelf Blowers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BA350 MA Controller Shelf Device Addresses . . . . . . . . . . . . . . . . . .
6x1 to 6x3 3½-Inch Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6x4 to 6x7 3½-Inch Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6x1 to 6x4 5¼-Inch Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing a Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Blowers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1
1–2
1–3
2–2
3–7
3–9
3–11
4–3
4–5

StorageWorks Related Documentation . . . . . . . . . . . . . . . . . . . . . . . .
BA350–MA StorageWorks Controller Shelf Products . . . . . . . . . . . . .
Single-Ended, SCSI–2 Bus Parameters . . . . . . . . . . . . . . . . . . . . . . . .
BA350–MA Controller Shelf System SCSI Bus Segments . . . . . . . . . .

vi
1–4
3–2
3–3

Tables
1
1–1
3–1
3–2

Preface
The StorageWorks Family BA350–MA Controller Shelf User’s Guide describes the
procedures for configuring, installing, and replacing the BA350–MA controller
shelf and its components.

Intended Audience
This manual is intended for use by personnel who will be configuring, using, or
replacing the BA350–MA StorageWorks™ controller shelves.
Note
Shelf installation procedures are cabinet specific and are not included in
this manual.

Structure
This manual is organized as follows:
Chapter 1

Describes the BA350–MA StorageWorks controller shelf to include
physical characteristics, layout, components, and StorageWorks
products.

Chapter 2

Describes the rules for configuring a BA350–MA controller shelf
with an HSJ40 installed.

Chapter 3

Describes the shelf-specific SCSI buses, to include calculating bus
length, positioning terminators and jumpers, and determining
device location.

Chapter 4

Describes the procedures for replacing the StorageWorks power
supplies, blowers, and shelves.

Glossary

Contains definitions of BA350–MA controller shelf terms.

Index

Provides a cross-reference to major topics.

Related Documents
Table 1 lists the StorageWorks related user documents organized by use, system,
or product.
Table 1 StorageWorks Related Documentation
Document Title

Order Number
StorageWorks Primary Publications†

StorageWorks Family Configuration Guide

EK–BA350–CG

StorageWorks Family User’s Guide‡

EK–BA350–UG

StorageWorks Family StorageWorks Building Blocks User’s Guide

EK–SBB35–UG

StorageWorks RAID Array 110 Subsystem
BA350–EA Modular Storage Shelf User’s Guide

EK–350EA–UG

BA35X–VA Vertical Mounting Kit User’s Guide

EK–350SV–UG

DEC RAID Utilities User’s Guide

EK–DECRA–UG

StorageWorks RAID Array 110 Subsystem User’s Guide

EK–SZ200–UG

StorageWorks Array Controller 140-Series
StorageWorks Array Controller HS Family of Array Controllers
User’s Guide

EK–HSFAM–UG

StorageWorks BA350–MA Controller Shelf User’s Guide

EK–350MA–UG

DECraid+ Rackmount Storage Subsystem
HSC Intelligent I/O Servers
HSC Controller User’s Guide

AA–PFSQA–TK

HSC Controller Installation Manual

EK–HSCMN–IN

StorageWorks Enclosures
BA35X–VA Vertical Mounting Kit User’s Guide

EK–350SV–UG

StorageWorks Family Desktop Expansion Unit User’s Guide

EK–BA353–UG

StorageWorks Metric Shelf Bracket Kit Installation Guide

EK–35XRD–IG

StorageWorks RETMA Shelf Rail Kit Installation Guide

EK–35XRB–IG

StorageWorks SW500-Series Data Center Cabinet Installation and
User’s Guide

EK–SW500–IG

StorageWorks SW800-Series Data Center Cabinet Cable
Distribution Unit Installation Guide

EK–SWCDU–IS

StorageWorks SW800-Series Data Center Cabinet Installation and
User’s Guide

EK–SW800–IG

Legend:
†—Provided with each system
‡—Includes BA350–SA SBB shelf user’s guide
§—Available from Digital Account Representative

(continued on next page)

Table 1 (Cont.) StorageWorks Related Documentation
Document Title

Order Number
Alpha AXP DEC 7000 and DEC 1000 Systems

BA350–LA Modular Storage Shelf User’s Guide

EK–350LA–UG

BA655 SCSI Disk and Tape PIU Installation Guide

EK–BA655–IN

Storage Devices
Installation Notice—RZ73 Bus Termination and Jumper
Installation Guide

EK–RZ73X–IS

RRD42 Disk Drive Owner’s Manual

EK–RRD42–OM

RZ Series Disk Drive Installation Guide

EK–DRZ01–IG

RZ Series Disk Drive Reference Manual

EK–RZXXD–RM

RZ24 Hard Disk Drive Installation Guide

EK–RZ24I–IS

RZ26B Disk Drive Installation Guide

EK–RZ26B–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

TZ30 Cartridge Tape Drive Operator’s Manual

EK–OTZ30–OM

TZ30 Cartridge Tape Drive Reference Card

EK–OTZ30–RC

TZ30 Cartridge Tape Drive Technical Manual

EK–OTZ30–TM

General Reference Publications
Digital Systems and Options Catalog§
Small Computer System Interface, An Overview

EK–SCSIS–OV

Small Computer System Interface, A Developer’s Guide

EK–SCSIS–DK

Legend:
†—Provided with each system
‡—Includes BA350–SA SBB shelf user’s guide
§—Available from Digital Account Representative

vii

Manufacturer’s Declarations
The following comments are applicable to the StorageWorks product line:
CAUTION
This is a class A product. In a domestic environment, this product may
cause radio interference, in which case the user may be required to take
adequate measures.

ACHTUNG !
Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen
können bei Betrieb dieses Gerätes Rundfunkstörungen auftreten, in
welchen Fällen die Benutzer für entsprechende Gegenmaßnahmen
verantwortlich sind.

ATTENTION !
Ceci est un produit de Classe A. Dans un environment domestique, ce
produit risque de créer des interférences radiélectriques, il appartiendra
alors à l´utilisateur de prendre les mesures spécifiques appropriées.

Acoustic Noise Declaration
Acoustics - Preliminary Declared Values per ISO 9296 and ISO 7779

Sound Power Level
 , B‡

Sound Pressure Level
   , dBA
(Bystander Positions)

Product†

Idle

Operate

Idle

Operate

BA350–MA Controller Shelf

5.8

5.7

Deskside Expansion Enclosure at the Side of the Desk
BA350–MA Controller Shelf

Product†

5.7

Sound Power Level
 , B‡

Sound Pressure Level
  , dBA
(Operator Positions)

Idle

Operate

Idle

Operate

5.7

Deskside Expansion Enclosure at the Side of the Desk
BA350–MA Controller Shelf
Deskside Expansion Enclosure on Top of the Desk
BA350–MA Controller Shelf

† Current values for specific configurations are available from Digital Account Representatives.
‡ 1 B = 10 dBA

Schallemissionswerte - Vorläufige Werteangaben nach
ISO 9296 und ISO 7779/DIN EN27779

Gerät†
BA350–MA Controller Shelf

Schalleistungspegel
 , B‡

Schalldruckpegel
   , dBA
(Beistehende Position)

Leerlauf

Betrieb

Leerlauf

Betrieb

5,8

5,7

Deskside Expansion Enclosure neben einem Schreibtisch
BA350–MA Controller Shelf

Gerät†

5,7

Schalleistungspegel
 , B‡

Schalldruckpegel
  , dBA
(Bediener Position)

Leerlauf

Betrieb

Leerlauf

Betrieb

5,7

Deskside Expansion Enclosure neben einem Schreibtisch
BA350–MA Controller Shelf

5,7

Deskside Expansion Enclosure auf einem Schreibtisch
BA350–MA Controller Shelf

5,7

† Aktuelle Werte für spezielle Ausrüstungsstufen sind über die Digital Equipment Vertretungen
erhältlich.
‡ 1 B = 10 dBA

Für Bundesrepublik Deutschland
For Federal Republic of Germany
Pour la République féderale d’Allemagne
Hochfrequenzgerätezulassung und Betriebsgenehmigung
Bescheinigung des Herstellers/Importeurs:
Hiermit wird bescheinigt, daß die Einrichtung in Übereinstimmung mit
den Bestimmungen der DBP-Verfügung 523/1969, Amtsblatt 113/1969, und
Grenzwertklasse "A" der VDE0871 funkentstört ist.
Das Bundesamt für Zulassungen in der Telekommunikation der Deutschen
Bundespost (DBP) hat diesem Gerät eine FTZ-Serienprüfnummer zugeteilt.
Betriebsgenehmigung:
Hochfrequenzgeräte dürfen erst in Betrieb genommen werden, nachdem hierfür
von dem für den vorgesehenen Aufstellungsort zuständigen Fernmeldeamt mit
Funkstörungsmeßstelle die Genehmigung erteilt ist.
Als Antrag auf Erteilung einer Genehmigung dient eine Anmeldepostkarte
(Anhang des Handbuches) mit Angabe der FTZ-Serienprüfnummer.
Der untere Teil der Postkarte ist vom Betreiber zu vervollständigen und an das
örtliche Fernmeldeamt zu schicken. Der obere Teil bleibt beim Gerät.
Betreiberhinweis:
Das Gerät wurde funktechnisch sorgfältig entstört und geprüft. Die
Kennzeichnung mit der Zulassungsnummer bietet Ihnen die Gewähr, daß
dieses Gerät keine anderen Fernmeldeanlagen einschließlich Funkanlagen stört.
Sollten bei diesen Geräten ausnahmsweise trotzdem, z.B. im ungünstigsten Fall
beim Zusammenschalten mit anderen EVA-Geräten, Funkstörungen auftreten,
kann das im Einzelnen zusätzliche Funkentstörungsmaßnahmen durch den
Benutzer erfordern.
Bei Fragen hierzu wenden Sie sich bitte an die örtlich zuständige
Funkstörungsmeßstelle Ihres Fernmeldeamtes.
Externe Datenkabel:
Sollte ein Austausch der von Digital spezifizierten Datenkabel nötig werden,
muß der Betreiber für eine einwandfreie Funkentstörung sicherstellen, daß
Austauschkabel im Aufbau und Abschirmqualität dem Digital Originalkabel
entsprechen.
Kennzeichnung:
Die Geräte werden bereits in der Fertigung mit der Zulassungsnummer
gekennzeichnet und mit einer Anmeldepostkarte versehen. Sollte Kennzeichnung
und Anmeldepostkarte übergangsweise nicht mit ausgeliefert werden,
kontaktieren Sie bitte das nächstgelegene Digital Equipment Kundendienstbüro.

xii

1
Introducing the BA350–MA
StorageWorks Controller Shelf
This chapter describes the BA350–MA StorageWorks controller shelf, to include
the shelf layout, dimensions, the external Small Computer System Interface
(SCSI) connections (ports) for StorageWorks building block shelves (SBB
shelves), and the general shelf specifications.
Note
The procedures for installing a controller shelf, routing cables, and
connecting cables are unique to each cabinet and are described in the
cabinet-specific manuals.

1.1 Product Description
The BA350–MA controller shelf (see Figure 1–1) is used for the HS-series of array
controllers, such as the HSJ40 controller. The only StorageWorks building
blocks (SBBs) that can be installed in this shelf are the power supplies. No
storage SBBs can be installed in this shelf.
Figure 1–1 BA350–MA StorageWorks Controller Shelf

CONTROLLER 1
CONTROLLER 2

CXO-3846A-PH

Introducing the BA350–MA StorageWorks Controller Shelf

1–1

Introducing the BA350–MA StorageWorks Controller Shelf
1.1 Product Description
As shown in Figure 1–2, each shelf can have the following components:
•

Two controllers (Controller 1 and Controller 2)

•

Two cache modules (one for each controller)

•

Two power supplies

Controller 1 is assigned SCSI device-side, single-ended device address 7. Controller 2 is
assigned SCSI device-side, single-ended address 6. The cache module for each controller is
installed directly beneath the controller.
Note
There are two sets of SCSI device addresses: the host-side and the
device-side. The host-side is for the host and controllers. The
device-side is for the controllers and the devices. Only the deviceside, single-ended, SCSI device addresses are discussed in this manual.
Controller device addresses are initiator IDs; storage device addresses
are target IDs.

Figure 1–2 BA350–MA Controller Shelf Layout
SHELF
POWER
SUPPLY

REDUNDANT
POWER
SUPPLY

PORT 1

PORT 0

CONTROLLER 1

CACHE 1
PORT 0

SCSI 2

PORT 1

PORT 2

CONTROLLER 2

CACHE 2
SCSI 1

PORT 2

SCSI 3

SCSI 4

SCSI 5

SCSI 6

CXO-3839A-MC

Below the Controller 2 cache module are six 50-pin, high-density, female SCSI–2
connectors for connecting SBB shelf SCSI cables. Each controller connector port
(three per controller) controls two SCSI buses. The relationship of the controller
connectors (ports) to the SCSI bus connectors (ports) are as follows:
Controller Port

SCSI Ports

Port 0

Port 1
Port 2

Port 1

Port 3
Port 4

Port 2

Port 5
Port 6

1–2 Introducing the BA350–MA StorageWorks Controller Shelf

Introducing the BA350–MA StorageWorks Controller Shelf
1.1 Product Description
The controller shelf can be installed in either an SW500-series or the
SW800-series data center cabinet1 and oriented either horizontally or
vertically. The orientation and location of each controller shelf are described
in the cabinet documentation and in the HS Family of Array Controllers User’s
Guide. The dimensions of this shelf, in millimeters (mm) and inches, are as
follows:
Dimension

Inches

Height
Width
Depth

150
445
350

5.9
17.5
13.8

The arrangement of shelf components are as follows:
•

The shelf ac power supply is mounted in the leftmost slot of a horizontally
mounted shelf (the top slot of a vertically mounted shelf).

•

The redundant ac power supply is mounted in the second slot from the left
(top).

•

The redundant power supply slot can be used for a storage SBB, provided no
controller has a device initiator ID of 6.

•

As shown in Figure 1–3, each shelf has two replaceable blowers mounted on
the rear of the shelf.

Figure 1–3 Shelf Blowers

BLOWER 2

BLOWER 1

CXO-3847A-PH

The BA350–MA shelf is not installed in deskside enclosures.

Introducing the BA350–MA StorageWorks Controller Shelf

1–3

Introducing the BA350–MA StorageWorks Controller Shelf
1.2 BA350–MA Controller Shelf Products

1.2 BA350–MA Controller Shelf Products
Table 1–1 lists the StorageWorks products that can be used with this shelf. The
information in this table is general in nature2 and is based on the following:
•

A BA350–MA controller shelf with HSJ40 array controller with a read cache
module

•

The BA350–MA controller shelf is installed in an SW800-series data center
cabinet.

•

The following factors will affect the information presented in Table 1–1:
–

The configuration type (optimal performance; optimal availability)

–

The controller configuration (non-redundant; dual-redundant)

–

The redundant array of independent disks (RAID) set (0, 1, 3, or 5) used

Table 1–1 BA350–MA StorageWorks Controller Shelf Products
StorageWorks Product

Min

Max

Comments

SCSI Bus
Single-ended, device-side, SCSI buses

Standard

Cooling
BA35X–MA blower

Standard

Array Controllers and Read Cache Module
HSJ40 Controller Module with either a
16 MB or 32 MB cache module

Two controllers are required for dual-redundant
operation.

Power Units
BA35X–HA ac power supply

Digital recommends two power supplies per
controller shelf and SBB shelf.

Supported Storage Shelf and Storage Device Configurations
BA350–SA SBB shelves
All 3½-inch SBBs
All 5¼-inch SBBs

6
12

3½-inch SBBs
per SCSI bus
per HSJ40 system

1
6

7
42

5¼-inch SBB
per SCSI bus
per HSJ40 system

1
6

4
24

Digital recommends two power supplies per
shelf.

Digital recommends a maximum of 6 3½-inch
SBBs per SCSI bus for a maximum of 36
devices per system.
Requires three slots

For a detailed description of the recommended configurations, see the HS Family of
Array Controllers User’s Guide.

1–4 Introducing the BA350–MA StorageWorks Controller Shelf

2
Configuration Rules
This chapter describes the specific rules for configuring a BA350–MA controller
shelf system, to include SBBs, power, and SCSI device addressing. These rules
are used to plan a system configuration. Subsequent chapters provide detailed
procedures for implementing the configuration rules.
Note
The configuration rules in the following sections have precedence over
those listed in the StorageWorks Family Configuration Guide.

2.1 SBB Configuration Rules
Use the following rules to configure the SBBs in the BA350–SA SBB shelves:
•

Refer to the StorageWorks Family Configuration Guide for the Digital
StorageWorks storage devices available.

•

The following factors determine the maximum number of SBBs you can
install in an SBB shelf:
— The SBB physical size (either 3½-inch or 5¼-inch)
— The bus configuration
— The controller device address

2.2 Power Configuration Rules
Use the following rules to configure the power:
•

Each controller or SBB shelf requires an ac shelf power supply.

•

The shelf power supply is installed in the leftmost (top) SBB slot.

•

Digital recommends that all controller shelves have a shelf power supply and
a redundant power supply. The redundant power supply is installed in the
slot next to the shelf power supply.

•

Digital recommends that the SBB shelves have a redundant power supply
installed.
Note
No SBB shelf can have a redundant power supply when the system is
configured for seven storage devices in a shelf.

Configuration Rules

2–1

Configuration Rules
2.3 SCSI Device Addressing Rules

2.3 SCSI Device Addressing Rules
Use the following rules to assign device addresses to the controllers and SBBs
(disk drives, tape drives, and so forth) in a system with an BA350–MA controller
shelf:
•

The maximum number of device addresses per SCSI bus is eight (0 through
7).

•

The maximum number of device addresses per SBB shelf is seven (0 through
6).

•

The controllers in the BA350–MA controller shelf are automatically assigned
a device address based upon their physical location, as shown in Figure 2–1.

Figure 2–1 BA350 MA Controller Shelf Device Addresses

DEVICE ADDRESS 7
DEVICE ADDRESS 6

CXO-3870A-PH

CAUTION
When Controller 2 is installed in the third BA350–MA controller shelf
slot,
•

No 3½-inch disk SBB can be installed in slot 6 of any SBB shelf

•

No 3½-inch tape drive SBB or any 5¼-inch SBB device address switch
can be set to device address 6

or the SCSI bus will malfunction.

2–2 Configuration Rules

3
SCSI Bus Configurations
This chapter describes the BA350–MA StorageWorks controller shelf SCSI buses
with HSJ40 array controllers installed.
Note
SCSI bus configurations are controller-specific. The SCSI bus
configurations described in this chapter apply only to the HSJ40
controller.

See the HS Family of Array Controllers User’s Guide for detailed information
about the HSJ40 controller.

3.1 SCSI Bus Description
The BA350–MA controller shelf has six, single-ended, SCSI–2 buses. The 50-pin,
high-density, female connectors for these buses are located at the bottom of a
horizontally mounted shelf (the left side of vertically mounted shelf). These buses
are numbered 1 through 6 starting at the left (top).
Each SCSI bus can have a maximum of eight devices connected to it, including
the controller. Valid configurations include the following:
Controller Shelf
Configuration

Controllers

SBB Shelf

Power SBBs

Devices

Power SBBs

Non-Redundant

Dual-Redundant

In a non-redundant configuration, the controller (Controller 1) is mounted in the
top (righthand) location. In a dual-redundant configuration the second controller
(Controller 2) is mounted in the third slot from the top (right).
CAUTION
When Controller 2 is installed in the third slot of the BA350–MA
controller shelf,
•

No 3½-inch disk SBB can be installed in slot 6 of any SBB shelf

•

No 3½-inch tape drive SBB or any 5¼-inch SBB device address switch
can be set to device address 6

or the SCSI bus will malfunction.

SCSI Bus Configurations

3–1

SCSI Bus Configurations
3.1 SCSI Bus Description
These buses can transfer data at either 5 MB/s (Megabytes per second) or 10
MB/s. The rate at which data is transferred is affected by many things. However,
the two primary concerns are as follows:
•

The maximum rate at which the controller or initiator can transmit data

•

The maximum rate at which the target device can process data

The total length of a SCSI bus is measured from the terminator on the controller
to the terminator on the SBB shelf. The maximum length of these buses,
including all cables and shelf buses, is shown in Table 3–1:
Table 3–1 Single-Ended, SCSI–2 Bus Parameters
Bus Type

Transfer Rate

Meters

Feet

8-bit, single-ended

5 MB/s

19.7

8-bit, single-ended

10 MB/s

9.8

3.2 Calculating the SCSI Bus Length for a Single SBB Shelf
The SCSI bus for a single shelf is composed of the following segments:
•

Segment A—The distance from the controller terminator to the shelf
backplane connector (port) and from there to the SCSI bus connector

•

Segment B—The length of the BN21H-series cable from the controller shelf
to the SBB shelf (either 1 meter [3.3 feet] or 2 meters [6.5 feet])

•

Segment C—For a single SBB shelf this is the distance from the SBB shelf
input connector to the shelf SCSI terminator.

Use the information in Table 3–2 and the following formula to calculate the
length of a SCSI bus:
  "!

3.3 Calculating the SCSI Bus Length for Multiple SBB Shelves
The SCSI bus for multiple SBB shelves on a single SCSI bus is composed of the
following segments:
•

Segment A—The distance from the controller terminator to the shelf
backplane connector (port) and from there to the SCSI bus connector

•

Segment B—The length of the BN21H-series cable from the controller shelf
to the SBB shelf (either 1 meter [3.3 feet] or 2 meters [6.5 feet])

•

Segment D—The distance from the first SBB shelf input connector to the
shelf output connector

•

Segment E—The length of the BN21H-series cable (0.5 meters or 1.6 feet)
that connects the first shelf to the second shelf

•

Segment F—The distance from the input connector on the second shelf to
the bus terminator on the same shelf.

3–2 SCSI Bus Configurations

SCSI Bus Configurations
3.3 Calculating the SCSI Bus Length for Multiple SBB Shelves
Use the information in Table 3–2 and the following formula to calculate the
length of a SCSI bus:

Table 3–2 BA350–MA Controller Shelf System SCSI Bus Segments
Length
Segment

From

Meters

Inches

Feet

0.25

10.3

0.9

1.0
2.0

39.4
78.8

3.3
6.6

0.4
0.6
0.9

16.4
23.6
34.7

1.4
2.0
2.9

BA350–MA Controller Shelf
A

Controller terminator

SCSI port
Controller Shelf to First SBB Shelf

B†

Controller shelf output connector

SBB shelf input connector

Single SBB Shelf
C

3 device input connector
4 device input connector
7 device input connector

Terminator in slot 5
Terminator in slot 5
Terminator in slot 1
Multiple SBB Shelves

7 device input connector

Output connector

0.9

35.7

3.0

E†

Shelf 1 output connector

Shelf 2 input connector

0.5

19.7

1.6

3 device input connector
4 device input connector
7 device input connector

Terminator in slot 5
Terminator in slot 5
Terminator in slot 1

0.4
0.6
0.9

16.4
23.6
34.7

1.4
2.0
2.9

† BN21H-series cable

SCSI Bus Configurations

3–3

SCSI Bus Configurations
3.4 Configuring SCSI Buses

3.4 Configuring SCSI Buses
The flexibility of the StorageWorks product family permits the installation of
both 3½-inch and 5¼-inch SBBs in the same shelf. This, plus the capabilities
of using either one or two controllers or having two separate buses on one SBB
shelf, provides for many unique, solution-oriented configurations. Rather than
describing all the possible configurations, the material in this section describes
the basic configurations, each using either all 3½-inch SBBs or all 5¼-inch SBBs.
From the information presented in Table 3–2 and the following sections, you can
develop configurations that meet specific system needs.
To quickly identify the number of SCSI buses and the maximum number of
devices on each bus, the StorageWorks documentation identifies the bus with a
three-character identifier with that has the format bxd,
where:
b is the number of SCSI buses
d is the maximum number of devices per bus
The following example defines some of the typical identifiers:
Bus

Definition

6x1

A six SCSI bus system with one device per bus, for a total of six devices.

5x3

A five SCSI bus system with three devices per bus, for a total of 15 devices.

3–4 SCSI Bus Configurations

SCSI Bus Configurations
3.4 Configuring SCSI Buses
3.4.1 3½-Inch SBB SCSI Bus Configurations
The 3½-inch SBB SCSI bus configurations listed in this section were developed
based on the following premises:
•

•

Digital recommends using 6x1 through 6x6 SCSI buses with the following
components:
–

Two HSJ40 controllers, a dual-redundant controller configuration

–

Two ac power supplies in the controller shelf

–

Two ac power supplies in each SBB shelf

An alternate configuration is a 6x7, non-redundant controller configuration
that includes the following:
–

A single HSJ40 control installed in the top (righthand) controller shelf
location

–

Two ac power supplies in each SBB shelf

–

One ac power supply in the controller shelf

•

When the second controller is installed, no SBB can use device address 6.

•

Only three BA350-SA SBB shelves are required for 6x1, 6x2, and 6x3 3½-inch
SBBs bus configurations.

•

Six BA350–SA SBB shelves are required for 6x4, 6x5, 6x6, and 6x7 3½-inch
SBB bus configurations

•

The device address switches on the rear of the 3½-inch tape drive SBBs must
be set as described in the StorageWorks Family User’s Guide to ensure that
there are no duplicate addresses on the bus.

SCSI Bus Configurations

3–5

SCSI Bus Configurations
3.4 Configuring SCSI Buses
3.4.2 6x1 to 6x3 3½-Inch Bus Configurations
The 6x1 through 6x3 bus configurations require only three SBB shelves.
However, adding more devices requires purchasing additional shelves and either
reconstructing all the RAID sets or following an involved and time-consuming
upgrade process. A six shelf system can be upgraded simply by adding devices to
each bus with minimal impact on system operations.
Figure 3–1 shows the cabling and location of the terminators and jumpers on each
shelf. These configurations are unique in that they use both SBB shelf SCSI-2
connectors (JA1 and JB1) as input connectors. This results in the following
configuration:
•

SCSI connector JA1 connects the controller to device addresses 0, 2, and 4.

•

SCSI connector JB1 connects the controller to device addresses 1, 3, and 5.

•

Digital recommends that a redundant power supply be installed in slot 6.

•

Device address 6 cannot be used in a dual-rendundant controller
configuration.

•

The terminator board in slot 5 actively terminates both SCSI buses.

•

The jumper board installed in slot 1 has no function in this configuration.
Note
SCSI connector JB1 can only be used as an input connector when a shelf
SCSI bus terminator is installed in slot 5.

3–6 SCSI Bus Configurations

SCSI Bus Configurations
3.4 Configuring SCSI Buses
Figure 3–1 6x1 to 6x3 3½-Inch Buses

(7) POWER
J

T
POWER

POWER

(7)

(6)

POWER

POWER
(6)

POWER

POWER
(6)

0
J

JB1

JA1
3
4

0
J

(7)

(6) POWER
1

(7)

JA1

JB1
JA1

5
6

JB1
CONTROLLER 2
CONTROLLER 1
CXO-3842A-MC

SCSI Bus Configurations

3–7

SCSI Bus Configurations
3.4 Configuring SCSI Buses
3.4.3 6x1 to 6x7 3½-Inch Bus Configurations
The 6x4 through 6x7 configurations require six SBB shelves. Digital recommends
that six shelves also be used for the 6x1 through 6x3 configurations because this
will significantly reduce the time required to expand the system.
Figure 3–2 shows the cabling and location of the terminators and jumpers on
each shelf for the 6x1 through 6x7 configurations. All of these configurations
use SCSI-2 connector JA1 as an input connector. This results in the following
configuration:
•

The jumper board in slot 5 connects the two SBB shelf buses into a single
bus.

•

SCSI connector JA1 connects the controller to all seven SBB slots (device
addresses 0 through 6).

•

Digital recommends that a redundant power supply be installed in slot 6.

•

Device address 6 cannot be used in a dual-rendundant controller
configuration.

•

The terminator board in slot 1 actively terminates the SCSI bus.

3–8 SCSI Bus Configurations

SCSI Bus Configurations
3.4 Configuring SCSI Buses
Figure 3–2 6x4 to 6x7 3½-Inch Buses

JA1

POWER
(7)

(6) POWER

JB1

POWER

JB1

JA1

POWER

CONTROLLER 2
6

JB1

CONTROLLER 1

JA1

POWER
(7)

JA1

(7)

JB1
JA1

POWER
(7)

(7) POWER

JA1

POWER
(7)

JB1

JB1
CXO-3843A-MC

SCSI Bus Configurations

3–9

SCSI Bus Configurations
3.4 Configuring SCSI Buses
3.4.4 5¼-Inch Bus Configurations
The 6x1 and 6x2 configurations can be installed in six SBB shelves. Expansion to
either a 6x3 or a 6x4 5¼-inch bus requires 12 SBB shelves. For systems with only
5¼-inch devices, Digital recommends that 12 shelves also be installed for the 6x1
and 6x2 configurations to permit expansion. This section describes configurations
using 12 shelves.
Figure 3–3 shows the cabling and location of the terminators and jumpers on
each shelf for the 6x1 through 6x4 configurations. All of these configurations
use SCSI-2 connector JA1 as an input connector. This results in the following
configuration:
•

The first (top) shelf in each pair does not have a terminator installed.

•

The jumper board in slot 5 of the first shelf connects the two SBB shelf
buses into a single bus and routes them to SCSI connector JB1, the output
connector.

•

The output connector of the first shelf is connected to the JA1, the input
connector on the second shelf.

•

SCSI connector JA1 on the second shelf connects the controller to all seven
SBB slots (device addresses 0 through 6).
Note
Connector JB1 can only be used as an output connector on a shelf that
has a SCSI bus jumper board installed in slot 5 and no terminator board
installed.

3–10 SCSI Bus Configurations

SCSI Bus Configurations
3.4 Configuring SCSI Buses
Figure 3–3 6x1 to 6x4 5¼-Inch Buses
JA1

J
POWER

POWER

SHELF 1

(7)

(6)

JB1
5

J
POWER

POWER

SHELF 2

(7)

(6)

0
T

JA1

J
POWER

POWER

SHELF 3

(7)

(6)

POWER

(7)

(6)

POWER

(7)

(6)

POWER

(7)

POWER

(7)

(6)

0
T

POWER

(7)

(6)

POWER

(7)

(6)

POWER

(7)

(6)

0
T

POWER

(7)

(6)

POWER

(7)

(6)

JB1
JA1

OUT
CONTROLLER 2
JA1

CONTROLLER 1

JB1
JA1

JB1
5

OUT
IN
JA1

JB1
JA1

JB1
5
J

SHELF 12

SHELF 11

JA1

JB1
5

SHELF 10

OUT
IN

SHELF 9

(6) POWER

SHELF 8

(7) POWER

SHELF 7

JB1
JA1

JB1
J

SHELF 6

OUT

JA1

SHELF 5

JB1
JA1

JB1
5
J

SHELF 4

OUT
IN

OUT
IN
JA1

JB1

CXO-3841A-MC

SCSI Bus Configurations

3–11

4
Replacement Procedures
This chapter describes the detailed procedures for replacing a power supply or a
blower, and the general procedures for replacing a BA350–MA controller shelf.
Note
Detailed procedures for replacing controllers are described in the HS
Family of Array Controllers User’s Guide. Detailed procedures for
replacing storage SBBs are described in the StorageWorks Family User’s
Guide.

Replacement Procedures

4–1

Replacement Procedures
4.1 Replacing a Power Supply

4.1 Replacing a Power Supply
There are two methods for replacing a power supply: the hot-swap method and
the cold-swap method.
•

Use the hot-swap method to replace power supplies only when there are two
power supplies in a shelf. This method allows you to remove the defective
power supply while the other supply furnishes the power.
Note
A hot-swap is a method of power supply removal that does not disable
the controller shelf or the associated SCSI buses.

•

The cold-swap method is normally used during initial installation or when
there is no operational shelf power supply. Should this occur, the controller
shelf, the controller, the cache module, and all associated SCSI buses are
disabled. None of the devices is operational until the power is restored.
Note
The procedures for removing power supplies and SBBs are basically the
same.

Use the following procedure to remove or replace a power unit.
CAUTION
The power supply is relatively heavy and can be damaged if dropped.
Therefore, always use both hands to fully support the power supply
during removal or installation.

1. As shown in Figure 4–1, press the two mounting tabs together to release the
power supply from the shelf.
2. Use both hands and pull the power supply out of the shelf.
3. Insert the replacement power supply into the guide slots and push it in until
it is fully seated and the mounting tabs engage the shelf.
4. After input power is applied, observe the power supply status LEDs to make
sure the power supply is functioning properly. Both status LEDs should be
on.

4–2 Replacement Procedures

Replacement Procedures
4.1 Replacing a Power Supply
Figure 4–1 Removing a Power Supply

CXO-3611B-PH

Replacement Procedures

4–3

Replacement Procedures
4.2 Replacing a Blower

4.2 Replacing a Blower
The BA350–MA StorageWorks controller shelf has blowers mounted on the rear.
Connectors on the backplane provide the +12 Vdc power to operate the blowers.
When either blower fails, the shelf status (upper) LED on the power SBB is off
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 supplies before removing shelf blower assemblies
or performing service in the backplane area, such as modifying the SCSI
bus.

Use the following procedure to replace a blower (see Figure 4–2).
1. If you cannot access the rear of the shelf, remove the shelf as described in
Section 4.3.1.
2. Disconnect the power cables to the shelf power SBBs.
3. Use a Phillips screwdriver to remove the safety screw in the upper right
corner or lower left corner of the blower.
4. Press the upper and lower blower mounting tabs together to release the
blower.
5. Pull the blower straight out to disconnect it from the shelf power connector.
6. Align the replacement blower connector and push the blower straight in,
making sure that both mounting tabs lock in place.
7. Replace the safety screw.
8. Replace the shelf as described in Section 4.3.2.
9. Connect the shelf power cables and verify that the shelf and all SBBs are
operating properly.
Note
If the upper power supply LED (shelf status) does not come on and all the
shelf power supplies are operating, the second blower may have failed or
the wrong blower was replaced.

4–4 Replacement Procedures

Replacement Procedures
4.2 Replacing a Blower
Figure 4–2 Replacing Blowers

CONNECTOR

PHILLIPS
SCREW

MOUNTING
TAB

BLOWER

GUIDE
CXO-3659A-PH

Replacement Procedures

4–5

Replacement Procedures
4.3 Replacing a StorageWorks Shelf

4.3 Replacing a StorageWorks Shelf
The procedures for removing or replacing any StorageWorks shelf are basically
the same. The major differences are the type of enclosure or cabinet in which
the shelf is mounted and the shelf orientation. Usually the only time you would
remove a shelf is to replace a blower.
Installing an additional shelf is not within the scope of this publication. Detailed
instructions for mounting a shelf in a cabinet are contained in the cabinet
installation guide listed in the Related Documents section of the preface.

4.3.1 Removing a Shelf
All shelves are inserted into a set of mounting brackets and secured in place with
a front locking bracket. Complete the following procedure to remove a shelf:
1. Turn off the power to the shelf and disconnect the power cords.
2. Record the location of each storage device, controller, and cache module in the
shelf.
3. Record the location of each controller interface cable.
4. Remove devices for access to the SCSI cable connectors.
5. Record the location of each SCSI cable.
6. Remove both the front locking brackets.
CAUTION
Be sure to fully support the weight of the shelf with both hands at all
times. Removing all the SBBs will significantly reduce the shelf weight.

7. Note the shelf orientation and carefully slide it out of the mounting brackets.

4.3.2 Installing a Shelf
Complete the following procedure to replace a shelf:
1. Orient the shelf and carefully slide it into the mounting brackets.
2. When it is fully seated, install the front locking brackets.
3. Connect each SCSI cable to the same connector from which it was removed.
4. Install each SBB, controller, and cache module in the same location from
which it was removed.
5. Connect each controller interface cable to the same connector from which it
was removed.
6. Insert the power SBB and connect the power cord.
7. Turn on power to the shelf and ensure that the shelf, the power supplies, and
all devices are functioning properly.
8. If you replaced a shelf blower, ensure that both blowers are functioning.

4–6 Replacement Procedures

Glossary
ac distribution
The method of distributing ac power in a cabinet.
adapter
See SCSI signal bus converter.
ANSI
American National Standards Institute
array controller
See controller.
building block shelf
See SBB.
channel
Another term for a SCSI bus.
CI
Computer interface. The computer interconnect bus with two serial paths, each
with a transfer rate of 70 Mb/s (8.75 MB/s).
cold-swap
A method of device replacement that requires that power be removed from
one or more shelves in a cabinet, thereby affecting other devices therein.
User applications that are not dependent upon the devices being swapped are
impacted as a result. This method is used when conditions preclude the use of
a warm-swap or hot-swap method. Normally, this method is only used when
installing or upgrading a StorageWorks subsystem.
See also warm-swap and hot-swap.
controller
A hardware/firmware device that manages communications on behalf of host
systems over the SCSI bus to devices, such as the HSC–series, HSJ–series, and
HSZ–series controllers. Controllers typically differ by the type of interface to the
host and provide functions beyond what the devices support.
controller shelf
Any StorageWorks shelf that contains only controllers and cache memories, for
example, a BA350–MA shelf.

Glossary–1

data center cabinet
A generic reference to the large cabinets, such as the SW800 series, in which SBB
shelves, controller shelves, or controller and SBB shelves can be mounted.
differential SCSI bus
A signal’s level is determined by the potential difference between two wires.
A differential bus is more robust and less subject to electrical noise than is a
single-ended bus.
disk
A storage device supporting random access to fixed size blocks of data.
disk array controller
See controller.
electromagnetic interference
See EMI.
electrostatic discharge
See ESD.
EMI
Electromagnetic interference. The impairment of a signal by an electromagnetic
disturbance.
ESD
Electrostatic discharge. The discharge of a potentially harmful static electric
voltage as a result of improper grounding.
full-height
(1) In the storage industry, a device of conventional dimensions. (2) A single
device mounted in an 5¼-inch SBB. Full-height devices have an order number
suffix of "VA."
FWD SCSI
The fast, wide, differential SCSI bus with a 16-bit data transfer rate of up to 20
MB/s.
See also FD SCSI and SCSI.
host
The primary or controlling computer or any such (in a multiple computer
network) to which storage is attached.
hot-swap
A method of device replacement whereby the complete system remains on line
and active during device removal or insertion. The device being removed or
inserted is the only device that cannot perform operations during this process.
User applications that are not dependent upon the device being swapped are not
impacted.
See also cold-swap and warm-swap.

Glossary–2

initiator
A SCSI device (usually a host system) that requests an operation to be performed
by another SCSI device (a target).
port
A logical route for data in and out of a controller. A port, in use, can contain one
or more channels, all of which contain the same type data.
RAID
Redundant Array of Independent Disks
SBB
StorageWorks building block. The basic building block of the StorageWorks
product line. Any device conforming to shelf mechanical and electrical standards
installed in either a 3½-inch or 5¼-inch carrier is considered to be an SBB,
whether it be a storage device, a power supply, a CPU, or other device.
SBB shelf
The common name for any StorageWorks shelf that contains only power supply
and storage SBBs.
SCSI
Small Computer System Interface. This ANSI interface defines the physical
and electrical parameters of a parallel I/O bus used to connect computers and a
maximum of seven devices. The StorageWorks subsystem implementation uses
SCSI–2, for the synchronous transfer of 8-bit data at rates of up to 10 MB/s.
SCSI device
A host computer adapter, a peripheral controller, or an intelligent peripheral that
can be attached to the SCSI bus.
SCSI device ID
The bit-significant representation of the SCSI addressing referring to one of the
signal lines numbered 0 through 7. Also referred to as target ID.
SCSI device-side device address
The eight device addresses (target IDs) assigned to the SCSI controller and the
devices it controls.
See also SCSI host-side device address.
SCSI host-side device address
The eight device addresses (target IDs) assigned to the host device and the SCSI
controllers and the devices it controls.
See also SCSI device-side device address.
SCSI port
Software: The channel that controls communications to and from a specific SCSI
bus in the system.
Hardware: The name of the logical socket at the back of the system unit to which
a SCSI device is connected.

Glossary–3

SCSI–A cable
A 50-conductor (25 twisted pair) cable used for single-ended, SCSI–2 bus
connections.
SCSI–P cable
A 68-conductor (34 twisted pairs) cable used for differential bus connections.
single-ended SCSI bus
Each signal’s logic level is determined by the voltage of a single wire in relation
to ground.
Small Computer System Interface
See SCSI.
StorageWorks
The Digital set of enclosure products that allows customers to design and
configure their own storage subsystem. Components include power, packaging,
and interconnections in a StorageWorks shelf. SBBs and array controllers are
integrated therein to form storage subsystems. System-level enclosures to house
the shelves and standard mounting devices for SBBs are also included.
StorageWorks building block
See SBB.
tape
A storage device supporting sequential access to variable sized data records.
tape controller
See controller.
target
A SCSI device that performs an operation requested by an initiator.
target ID
See SCSI device ID.
warm-swap
A method of device replacement whereby the complete system remains on line
during device removal or insertion. Activity may be suspended or paused for a
brief period of time during device insertion or removal. No booting or loading
of code is permitted except on the device being inserted. User applications that
are not dependent upon the devices on the affected SCSI bus are not noticeably
impacted.
See also cold-swap and hot-swap.

Glossary–4

Index
B
Blowers
location, 1–3
replacing, 4–4

C
Configuration
controller
dual-redundant, 1–4
non-redundant, 1–4
dual redundant controllers, 3–1
non-redundant controller, 3–1
recommended, 1–4
rules, 2–1
device addressing, 2–2
power, 2–1
type
optimal availability, 1–4
optimal performance, 1–4

D
Data center cabinets, 1–3
Device address, 1–2
device-side, 1–2

Replacing power SBBs
cold-swap method, 4–2
hot-swap method, 4–2

S
SCSI bus
configurations, 3–1, 3–4
3½-inch SBB, 3–4, 3–5
6x1 through 6x3, 3–6
6x1 through 6x7, 3–8
bus identification, 3–4
length, 3–2
multiple SBB shelves, 3–2
single SBB shelf, 3–2
ports, 1–2
Shelf
dimensions, 1–3
installation, 1–3
orientation, 1–3
replacement, 4–6
StorageWorks products, 1–4

T
Transfer rates, 3–2

P
Power supply, 1–3
configuration rules, 2–1
redundant, 1–3
shelf, 1–3

R
RAID, 1–4
Replacement
shelf, 4–6
Replacing
blowers, 4–4
power supplies, 4–2
shelves
installing, 4–6
removing, 4–6

Index–1