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Document:	StorageWorks Solutions 7 Device, 16-Bit SBB Shelf (BA356-S Series) User's Guide
Order Number:	EK-BA356-UG
Revision:	B01
Pages:	68
Original Filename:

OCR Text

1.76+105
7 Device, 16-Bit SBB Shelf
(BA356−S Series)
User’s Guide
Order Number:

EK–BA356–UG. B01

This publication describes the major StorageWorks 16-bit components (such as
shelves, power units, SBBs, SCSI buses, I/O modules, and cables), status displays,
specifications, and replacement procedures.

Digital Equipment Corporation
Maynard, Massachusetts

December 1995
While Digital believes the information included in this publication is correct as of the date of
publication, it is subject to change without notice.
FCC ID: AO9-BA356
NOTE: This equipment has been tested and found to comply with the limits for a Class B 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 this
equipment.
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful 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 or relocate the receiving antenna
• Increase the separation between the equipment and receiver
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected
• Consult the dealer or an experienced radio/TV technician for help
Copyright © Digital Equipment Corporation 1995.
Printed in the United States of America.
All rights reserved.
 HSC, HSZ, and StorageWorks, are trademarks of Digital Equipment Corporation.
This document was prepared using Microsoft Word, Version 7.0.

Table of Contents
Preface
1 Introduction
1.1 StorageWorks Components ....................................................................................1–1
1.2 Shelf Description....................................................................................................1–2

2 StorageWorks Status Reporting
2.1 Shelf Status ............................................................................................................2–1
2.1 ...............................................................................................................................2–1
2.1.1 SHELF_OK Signal .......................................................................................2–1
2.1.1......................................................................................................................2–1
2.1.2 Processing the SHELF_OK Signal................................................................2–2
2.1.3 SHELF_OK Jumper......................................................................................2–2
2.2 Shelf Status and Power Supply Status .....................................................................2–3
2.2 ...............................................................................................................................2–3
2.3 Storage SBB Status ................................................................................................2–4
2.4 Battery Backup Unit Status.....................................................................................2–6
2.5 16-Bit I/O Module Status........................................................................................2–7
3.1 Replacing a Storage Device or a Power Unit...........................................................3–1
3.1.1 SBB Identification Label...............................................................................3–3
3.1.2 Replacing an SBB.........................................................................................3–4
3.1.3 Replacing the I/O Module.............................................................................3–5
3.2 Replacing a Blower Assembly ................................................................................3–6
3.3 Replacing a StorageWorks Shelf.............................................................................3–8
3.3.1 Removing a Shelf .........................................................................................3–8
3.3.2 Installing a Shelf ..........................................................................................3–8

4 Power
4.1 Shelf Power Configuration Rules............................................................................4–1
4.2 Universal AC and DC Input Power Supplies...........................................................4–3
4.3 Battery Backup Unit ...............................................................................................4–4
4.4 Power Supply Replacement ....................................................................................4–4
4.4.1 Replacing a Shelf Power Supply ...................................................................4–5
4.4.2 Replacing a BBU..........................................................................................4–5
4.5 Power Cords and Cables.........................................................................................4–6

5 StorageWorks SCSI Buses
5.1 Assigning Device Addresses...................................................................................5–2
5.2 16-Bit I/O Module..................................................................................................5–5
5.2.1 Address Switches..........................................................................................5–6
5.3 SCSI Bus Length and Termination.........................................................................5–8
5.4 SCSI Bus Cables ....................................................................................................5–9
5.5 Shelf SCSI Bus Configurations.............................................................................5–11
5.6 Shelf with a Single SCSI Bus ...............................................................................5–13
5.7 Shelf with a Split SCSI Bus.................................................................................. 5–14
5.8 Two Shelves with a Single SCSI Bus....................................................................5–15

iii

5.9 8-Bit I/O Module..................................................................................................5–17
5.10 Description.........................................................................................................5–18
5.10.1 Data Bus Connections............................................................................... 5–19
5.10.2 Bus Termination....................................................................................... 5–19
5.10.3 Shelf Device Address Assignment ............................................................5–19
5.10.4 Swap Control............................................................................................5–19
5.10.5 Temperature Control ................................................................................5–19
5.11 Connecting to External Devices..........................................................................5–19
5.11.1 Single Bus Configuration..........................................................................5–19
5.11.2 Dual Bus Configuration ............................................................................ 5–20
5.12 SCSI Bus Cables ................................................................................................5–20
5.12.1 BN21H-Series SCSI Single-Ended Cables ................................................5–20
5.12.2 BN21R-Series SCSI Single-Ended Cables.................................................5–21
5.12.3 BN23G-Series SCSI Single-Ended Cables ................................................5–21
5.12.4 BC10U-Series SCSI Single-Ended Cables.................................................5–22
5.12.5 BC31B-Series HSC Controller Single-Ended Cable ..................................5–22
5.13 Installing the I/O Module ...................................................................................5–23

6 StorageWorks Product Specifications
6.1 Input Power Requirements......................................................................................6–1
6.2 Power Supplies.......................................................................................................6–1
6.3 Physical Specifications ...........................................................................................6–2
6.4 Environmental Specifications .................................................................................6–3
6.5 Environmental Stabilization ...................................................................................6–4

Glossary
Index
Figures
Figure 1-1 Typical 16-Bit Shelf—Front View..............................................................1–2
Figure 1-2 Blower Assembly .......................................................................................1–3
Figure 2-1 SHELF_OK Backplane Jumper ..................................................................2–2
Figure 2-2 Power Supply LEDs ...................................................................................2–3
Figure 2-3 Storage SBB LEDs.....................................................................................2–5
Figure 2-4 BBU LEDs.................................................................................................2–6
Figure 2-5 16-Bit I/O Module LEDs............................................................................2–7
Figure 3-1 SBB Identification Label ............................................................................3–3
Figure 3-2 Removing an SBB from the Shelf...............................................................3–4
Figure 3-3 Removing the I/O Module from the Shelf...................................................3–5
Figure 3-4 Replacing a Blower Assembly....................................................................3–7
Figure 4-1 Power Supply Status LEDs.........................................................................4–3
Figure 4-2 BBU LEDs.................................................................................................4–4
Figure 4-3 Removing an SBB from a Shelf..................................................................4–5
Figure 5-1 SBB Device Address Switches....................................................................5–3
Figure 5-2 BA356 Shelf with 16-Bit I/O Module .........................................................5–5
Figure 5-3 16-Bit I/O Module Features........................................................................5–6
Figure 5-4 Single-Shelf Address Configuration ...........................................................5–6
Figure 5-5 Dual-Shelf Address Configuration .............................................................5–7
Figure 5-6 16-Bit Backplane Termination ...................................................................5–8
Figure 5-7 Single Shelf SCSI Bus..............................................................................5–13

Figure 5-8 Single Shelf Configuration Address .........................................................5–13
Figure 5-9 Shelf with a Split SCSI Bus...................................................................... 5–14
Figure 5-10 Single Shelf Configuration Address ....................................................... 5–14
Figure 5-11 Single SCSI Bus on Two Shelves ...........................................................5–15
Figure 5-12 Dual Shelf Configuration Address..........................................................5–16
Figure 5-13 8-Bit I/O Module....................................................................................5–17
Figure 5-14 BA356 Shelf with 8-Bit I/O Module .......................................................5–18
Figure 5-15 I/O Module Features...............................................................................5–18
Figure 5-16 Installing the I/O Module .......................................................................5–24

Tables
Table 2-1 SHELF_OK Jumper ....................................................................................2–3
Table 2-2 Shelf and Single Power Supply Status LEDs................................................2–3
Table 2-3 Shelf and Dual Power Supply Status LEDs ..................................................2–4
Table 2-4 Storage SBB Status LEDs............................................................................2–5
Table 2-5 BBU Status LEDs........................................................................................2–6
Table 2-6 16-Bit I/O Module Status LEDs...................................................................2–7
Table 4-1 StorageWorks Power Units..........................................................................4–2
Table 4-2 Typical SBB DC Power Requirements.........................................................4–2
Table 4-3 Power Receptacle Wiring.............................................................................4–6
Table 5-1 SBB Device Address Switches.....................................................................5–3
Table 5-2 SCSI Bus Parameters...................................................................................5–9
Table 5-3 BN21L, 68-Pin High Density, Right Angle Connector Cable .....................5–10
Table 5-4 BN21K-68-Pin, High Density, Standard to Right Angle Connector Cable..5–10
Table 5-5 StorageWorks Bus Lengths........................................................................5–11
Table 5-6 Device Address Configurations..................................................................5–19
Table 5-7 BN21H-Series Cables................................................................................5–20
Table 5-8 BN21R-Series Single-Ended Cables ..........................................................5–21
Table 5-9 BN23G-Series SCSI Single-Ended Cables .................................................5–21
Table 5-10 BC10U-Series SCSI Single-Ended Cables ...............................................5–22
Table 5-11 BN31B-Series HSC Controller Single-Ended Cables ...............................5–22
Table 6-1 StorageWorks Power Supplies .....................................................................6–1
Table 6-2 StorageWorks Products Physical Specifications ...........................................6–2
Table 6-3 StorageWorks Environmental Specifications ...............................................6–3
Table 6-4 Thermal Stabilization ..................................................................................6–4

Preface
The StorageWorks Solutions 7 Device, 16-Bit SBB Shelf, BA356–S series User's Guide
introduces the 16-bit StorageWorks™ system and the elements common to the shelves,
StorageWorks building blocks (SBBs), and other components. This guide also describes the
components, status reporting, replacement procedures, power, small computer system
interface (SCSI) buses, SCSI bus signal converters, and specifications.
This guide, the StorageWorks Solutions Products Catalog, the StorageWorks Solutions 8-Bit
I/O Module, and the StorageWorks Solutions 16-Bit I/O Module comprise the StorageWorks
Solutions documentation set.

Intended Audience
This publication is for use by customers and Digital™ employees responsible for configuring,
installing, and maintaining the StorageWorks subsystem and its components.
_____________________________ Note ___________________________
Shelf installation procedures are cabinet specific and are not included in this
guide.
______________________________________________________________

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 also is used to indicate cross–references.

Structure
This manual is organized as follows:
Chapter 1

Describes the StorageWorks components.

Chapter 2

Describes how the shelf and the device status are monitored and reported.
This chapter includes recommended corrective action for fault conditions.

Chapter 3

Describes the procedures for replacing SBBs and shelves.

Chapter 4

Describes the StorageWorks power supplies, to include function, operation,
and status reporting.

Chapter 5

Describes the SBB shelf SCSI buses, including length, terminators, jumpers,
and devices.

Chapter 6

Lists the physical and electrical specifications for the StorageWorks family
components.

Glossary
Index

vii

Manufacturer’s Declarations
Acoustic Noise Declaration
BA356–SB StorageWorks Building Block Shelf
Acoustics–Preliminary Declared Values per ISO 9296 and ISO 7779
Sound Power Level
LWAd, B
Product

Idle

Operate

Sound Pressure Level
LpAmd BA,
(Bystander Positions)
Idle

Operate

BA356–SB SBB Shelf

5.8

BA356–SB SBB Shelf with :
Seven RZ26–VA Disk Drives

5.9

Deskside Expansion Enclosure at the Side of the Desk
BA356–SB SBB Shelf

5.7

BA356–SB SBB Shelf with :
Seven RZ26–VA Disk Drives

5.8

Schalldruckpegel
Schalleistungspegel
Gerät

Leerlauf

LpAm, dBA

(Beistehende Position)

LWAd, B
Betrieb

Leerlauf

Betrieb

BA356–SB SBB Shelf

5,8

BA356–SB SBB Shelf mit :
7 RZ26–VA Disk Drives

5,9

Deskside Expansion Enclosure neben einem Schreibtisch
BA356–SB SBB Shelf

5,7

BA356–SB SBB Shelf mit :
7 RZ26–VA Disk Drives

5,8

viii

1
Introduction
The StorageWorks Solutions 7 Device, 16-Bit SBB Shelf BA356–S series User's Guide is the
basic StorageWorks document. This guide provides information for configuring and
operating a system.

1.1 StorageWorks Components
See the StorageWorks Solutions Products Catalog for a complete listing of the StorageWorks
family products.
The scope of this guide is limited to providing information about the following:
•

Shelf status

•

Power supplies

•

Power unit status

•

Power requirements

•

Storage device status

•

Component functions

•

Shelf replacement procedures

•

I/O module replacement procedures

•

Blower replacement assembly procedures

•

Small computer system interface (SCSI) buses

•

StorageWorks building block (SBB) replacement procedures

_____________________________ Note ___________________________
The procedures for installing either an 16-Bit SBB shelf, a controller shelf, or a
controller and an SBB, routing cables, and connecting cables are unique to each
cabinet and are described in the cabinet manuals.
______________________________________________________________

Introduction 1–1

1.2 Shelf Description
The SBB shelf shown in Figure 1-1 can be used in several different cabinets and orientations.
The dimensions of this shelf are as follow:
Dimension

Millimeter

Inches

Height

150

5.9

Width

445

17.5

Depth

350

13.8

The shelf has the following capabilities and characteristics:
•

The capacity of the shelf is eight 3.5-inch SBBs and a I/O module.

•

, The SBB slots are numbered 0 through 7 from right to left (see Figure 1-1), starting with
the slot adjacent to the I/O module (16-bit I/O module is shown).

Figure 1-1 Typical 16-Bit Shelf—Front View

CXO-4319A-MC

1–2 Introduction

•

The I/O module provides a multifunction 8- or 16-bit extension of the 16-bit SCSI
backplane. It functions as a platform onto which a wide range of logical and interactive
circuitry can be placed.

•

The I/O module provides the means of configuring device addressing in each shelf to
permit a one- or two-shelf daisy chain array on one SCSI bus. This provides full 16-bit
SCSI address space in two shelves.

•

There are seven SCSI bus device addresses (that is, target IDs) that are numbered 0
through 6. These addresses can be assigned to either 3.5-inch or 5.25-inch SBBs.

•

The single shelf SCSI device addresses and the slot numbers are the same for slots 0
through 6. Slot 7 is reserved for the shelf power unit and does not have a device address.

•

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

•

There are two 50-pin, high-density, female SCSI connectors on the 8-bit I/O module that
are used for I/O and daisy chaining shelves.

•

There are two 68-pin, high-density, female SCSI connectors on the 16-bit I/O module that
are used for I/O and daisy chaining shelves.

•

The cabinet ac or dc cable distribution unit determines the type of power unit installed in
slot 7. The output of the power unit is +5 V dc and +12 V dc.

•

As shown in Figure 1-2, each shelf has two blowers mounted on the rear of the shelf.
These blowers pull air through the shelf and exhaust it out the rear.

Figure 1-2 Blower Assembly

BLOWER 2

BLOWER 1

CXO-5084A-MC

•

The I/O module monitors the blower operation via the logic signals on the backplane:
−

If a high ambient temperature condition is detected, both blowers automatically
switch to high speed.

−

If one blower is defective, the other blower automatically switches to high speed to
compensate.

The backplane supports SCSI–2 standards with 16-bit cabling and addressing as proposed in
SCSI–3.

Introduction 1–3

2
StorageWorks Status Reporting
This chapter describes the logic signals, their states and functions, and how to interpret the
light emitting diode (LED) displays.

2.1 Shelf Status
Each StorageWorks shelf identifies error conditions or failures caused by the major shelf
components, such as blowers, power supplies, or storage devices. This status is displayed on
either the power supply or the SBB LEDs. In addition to the visual display, the shelf
generates logic signals for processing by the SCSI controller or the host featuring the highavailability storage subsystem fault bus.
The StorageWorks shelf power supply provides dc power, and the blowers provide cooling for
storage devices. Failure of all blowers on a shelf causes devices to overheat and fail. When
there is only one power supply on a shelf, the loss of either dc voltage (+5 V dc, +12 V dc)
causes the controllers, cache memories, and storage devices to malfunction. The status of the
power supplies and the blowers is displayed by the power supply LEDs. This status signal is
available for processing by the SCSI controller or host featuring the high-availability storage
subsystem fault bus.
The status signal, SHELF_OK, is the result of logically anding a signal based on the speed of
all blowers on the shelf and the power good signals for all power units on the shelf. All
StorageWorks shelves have two blowers and at least one power supply providing the +5 V dc
and +12 V dc.

2.1.1 SHELF_OK Signal
All StorageWorks shelves can accommodate either two ac or two dc power supplies. The loss
of any dc voltage or blower causes the SHELF_OK signal to change from a high level to a low
level and turn off the upper power supply LED, even if there is sufficient power for proper
SBB operation. The defective blower or power supply should be replaced as soon as possible
to restore the subsystem to a redundant capability.
_____________________________ Note ___________________________
A single shelf can operate correctly with only one power supply furnishing +5 V
dc and +12 V dc.
______________________________________________________________
When an error condition exists and the SHELF_OK signal level changes from high to low, the
result is as follows:
•

The upper power supply LED, the shelf status LED, is off.

•

Some controllers can process this signal and notify the host that a power supply or blower
has failed. Review the SCSI controller documentation to determine if this signal can be
processed. These controllers implement the high-availability storage subsystem fault bus.

StorageWorks Status Reporting 2–1

2.1.2 Processing the SHELF_OK Signal
The controller can process the SHELF_OK signal only if the shelf is properly configured.
Make sure that a jumper is properly installed on the shelf backplane.
___________________________ CAUTION _________________________
Not all hosts and controllers can process the SHELF_OK signal. Before installing
the SHELF_OK jumper, read the controller documentation to determine if the
controller can process the SHELF_OK signal. Installing the SHELF_OK jumper
when the controller cannot process the SHELF_OK signal could result in the
power supply LEDs displaying incorrect shelf status.
______________________________________________________________
Use the procedures in the following sections to configure the SHELF_OK signal.

2.1.3 SHELF_OK Jumper
As shown in Figure 2-1, the SHELF_OK connector (J17), located on the backplane adjacent to
slot 2 (J12) behind the left-hand blower, has two pairs of jumper pins. Placement of jumper
W1 on these pins determines whether the SHELF_OK signal is:
•

Routed to the external cable connector (JA1 and JB1)

•

Routed to slot 0

Figure 2-1 and Table 2-1 describe the proper use of the SHELF_OK jumper W1.
Figure 2-1 SHELF_OK Backplane Jumper
CONTROLLER
CANNOT
PROCESS
SHELF_OK

CONTROLLER
CAN PROCESS
WITH DWZZB-VW
SHELF_OK

SLOT 2

CONTROLLER
CAN PROCESS
SHELF_OK
SLOT 2

SLOT 2

W1
SHELF_OK
EXTERNAL
SLOT 0
1

2
J17

SHELF_OK
EXTERNAL
CABLES
J12

SHELF_OK
EXTERNAL
SLOT 0
1

2
J17

SHELF_OK
EXTERNAL
CABLES
J12

SHELF_OK
EXTERNAL
SLOT 0
1

2
J17

SHELF_OK
EXTERNAL
CABLES
J12

CXO-4326B-MC

2–2 StorageWorks Status Reporting

Table 2-1 SHELF_OK Jumper
Controller Condition

W1
Position

The SCSI controller cannot process the SHELF_OK signal

Comments

NONE

Do not install jumper.

A controller that can process a Shelf_OK signal and a
DWZZB–VW SCSI signal converter is installed.†

SHELF_OK is routed to
slot 0.

The SCSI controller can process the SHELF_OK signal.

SHELF_OK is routed to
an external cable
connector.

† Refer to the DWZZB–VW in EK–DWZZx–UG. A01.

2.2 Shelf Status and Power Supply Status
The status of both the shelf blowers and the power supplies is displayed by the green power
supply LEDs as shown Figure 2-2. The upper LED displays the shelf status and the lower
LED displays the power supply status.
For a detailed explanation of the power supply LED codes, see Table 2-2 and Table 2-3.
Figure 2-2 Power Supply LEDs

POWER BUS
STATUS LED
(GREEN)
POWER SUPPLY
STATUS LED
(GREEN)

CXO-4787A-MC

Table 2-2 Shelf and Single Power Supply Status LEDs
Status LED

State

Indication

Shelf (upper)
PS (lower)

On
On

Normal operation.

Shelf (upper)
PS (lower)

Off
Off

Fault status, shelf and power supply fault.
Replace power supply as described in Section 4–1.

Shelf (upper)
PS (lower)

Off
On

Fault status, shelf fault but no power supply fault.
Replace shelf blower.

StorageWorks Status Reporting 2–3

_____________________________ Note ___________________________
When a shelf has two power supplies, you must observe the LEDs on both power
supplies (see Table 2-3) to determine the status.
______________________________________________________________
Table 2-3 Shelf and Dual Power Supply Status LEDs
Status LED

PS1†

PS2‡

Indication

Shelf (upper)
PS (lower)

On
On

Normal status. System is operating normally.

Shelf (upper)
PS (lower)

Off
On

Fault status. There is a shelf fault; there is no power
supply fault. Replace shelf blower.§

Shelf (upper)
PS (lower)

Off
On

Off
Off

Fault status. PS1 is operational. Replace PS2.

Shelf (upper)
PS (lower)

Off
Off

Off
On

Fault status. PS2 is operational. Replace PS1.

Shelf (upper)
Off
Off
Fault status. Possible PS1 and PS2 faulty or input
PS (lower)
Off
Off
power problem.
† Shelf power supply installed in slot 7.
‡ Redundant power supply installed in slot 6.
§ See I/O module indicators to determine the failed blower.

2.3 Storage SBB Status
StorageWorks shelves monitor the status of the storage SBBs. When a fault occurs, the fault
and the SBB device address (SCSI target ID) are reported to the controller or host for
processing. The High-availability storage subsystem fault bus controls the fault (lower) LED.
As shown in Figure 2-3, each storage SBB has two LED indicators that display the SBBs
status. These LEDs have three states: on, off, and flashing.
•

The upper LED (green) is the device activity LED and is on or flashing when the SBB is
active.
___________________________ CAUTION _________________________
Removing a storage SBB when the upper LED is on or flashing can cause the loss
or corruption of data.
______________________________________________________________

•

The lower LED (amber) is the storage SBB fault status LED and indicates an error
condition when it is either on or flashing.

2–4 StorageWorks Status Reporting

Figure 2-3 Storage SBB LEDs

DEVICE
ACTIVITY
(GREEN)
DEVICE
FAULT
(AMBER)

CXO-4652A-MC

Table 2-4 defines the valid states for these LEDs.
Table 2-4 Storage SBB Status LEDs
LED

Status

Indication

Device activity
Device fault

On
Off

SBB is operating normally.

Device activity
Device fault

Flashing
Off

SBB is operating normally.

Device activity
Device fault

Off
Off

SBB is operating normally. The SBB is inactive, and
there is no fault.

Device activity
Device fault

On
On

Fault status SBB is probably not responding to control
signals. Digital recommends that you replace the SBB.

Device activity
Device fault

Off
On

Fault status SBB is inactive and spun down. Digital
recommends that you replace the SBB.

Device activity
Device fault

On
Flashing

Fault status SBB is active and is spinning down
because of the fault.

Device activity
Device fault

Off
Flashing

Fault status SBB has been identified by the controller
as failed. Digital recommends that you replace the
SBB.

StorageWorks Status Reporting 2–5

2.4 Battery Backup Unit Status
The LEDs shown in Figure 2-4 display the status of the BBU.
Figure 2-4 BBU LEDs

BBU STATUS
(GREEN)
CHARGE
STATUS
(AMBER)
BBU
DISABLE

CXO-4458A-MC

These LEDs are controlled by internal BBU signals. The BBU status LED has three states: on,
off, and flashing. The charge status LED is either on or off. Error! Reference source not
found. defines the valid states for these LEDs.

Table 2-5 BBU Status LEDs
LED

Status

Indication

BBU Status
BBU Charge Status

On
Off

Normal status.
BBU is fully charged and operational.

BBU Status
BBU Charge Status

Off
On

Normal status.
BBU is charging.

BBU Status
BBU Charge Status

Flashing
On

Fault status. Power supply failure.
BBU is in use.

BBU Status
BBU Charge Status

Off
Off

Fault status.
Either power supply or BBU failure.

2–6 StorageWorks Status Reporting

2.5 16-Bit I/O Module Status
16-Bit I/O module LEDs indicate a blower failure or overtemperature condition. An ambient
temperature above 32 ±2°C (90 ±3°F) causes both blowers to operate at high speed. Figure 2-5
and Table 2-6 define the valid states for these LEDs. Table 2-2 defines the power supply shelf
status LED’s.
Figure 2-5 16-Bit I/O Module LEDs

BLOWER 2
STATUS LED
BLOWER 1
STATUS LED
CXO-4416A-MC

Table 2-6 16-Bit I/O Module Status LEDs
LED

Status

Indication

Blower 2†
Blower 1
Power Supply Shelf Status

Off
Off
On

Normal status. Blowers are operational.

Blower 2
Blower 1
Power Supply Shelf Status

On
On
On

Overtemperature condition. Both blowers to
high speed.

Blower 2
Blower 1
Power Supply Shelf Status

On
Off
Off

Blower 2 has failed. Blower 1 to high speed.

Blower 2
Blower 1
Power Supply Shelf Status

Off
On
Off

Blower 1 has failed. Blower 2 to high speed.

Blower 2
Blower 1
Power Supply Shelf Status

On
On
Off

Both blowers failed.

† See Figure 1-2 for blower identification.

StorageWorks Status Reporting 2–7

3
Replacement Procedures
This chapter describes the detailed procedures for replacing SBBs and blowers and the general
procedures for replacing an SBB shelf.
The most critical factors relating to removing or replacing storage SBBs or expanding a
StorageWorks system are as follows:
•

The device type

•

The SCSI bus device address

Once a device with a specific device address has been initialized on a SCSI bus, moving the
device to another bus or changing the device address can cause the bus to be erratic.
Adding devices to a redundant array of independent disks (RAID) set can involve adding
shelves and rerouting the SCSI buses. Rerouting a SCSI bus to a different shelf requires that
the configured SBBs must be located in the same logical location (that is, the same bus and
the same device address that they had prior to the expansion).
A label on the front of the SBB identifies the bus and device address for each storage device.
Figure 3-1 shows the factory and user entered definitions on a typical SBB identification label.

3.1 Replacing a Storage Device or a Power Unit
There are three methods for replacing SBBs, including power supplies: hot swap, warm
swap, and cold swap. You must determine the appropriate replacement method prior to
replacing a device or power supply.
The light emitting diodes (LEDs) on the front of the SBB indicate the status, either active or
inactive. The three SBB replacement methods are listed as follows:
___________________________ CAUTION _________________________
If you are not certain that your SCSI controller supports hot swap, Digital
recommends using warm swap to protect the integrity of your data.
______________________________________________________________
1.

Use hot swap to remove and replace SBBs from a system that is on-line and active. Not
all controllers support hot swap. Digital HSZ10, and HSZ15 controllers support hot
swap.
Read the controller documentation to determine which controller-supported swap method
to use.
Use hot swap to replace power supplies only when there are two power supplies in a shelf.
You can remove the failed power supply while the other furnishes the power.

StorageWorks Replacement Procedures 3–1

___________________________ CAUTION _________________________
Warm swap only if the device activity LED is off and the controller supports warm
swap. The following Digital controllers support warm swap: HSD30-series,
HSJ30-series, HSJ40-series, HSZ40-series, and HSD05.
______________________________________________________________
2.

Use warm swap only if you quiesce the bus. Quiesce the bus by removing all signal
activity.

Use cold swap during initial installation or when adding shelves. All devices are inactive
and without power and are not operational until power is restored.

3–2 StorageWorks Replacement Procedures

3.1.1 SBB Identification Label
The SBB identification label shows the SBB device, the shelf bus type (8- or 16-bit), and user
specific information (see Figure 3-1).
Figure 3-1 SBB Identification Label
1
2

RZ26L-VW
1GB

LUN #

ID #

CH #

20
F10
W
6

W
7
CXO-4465A-MC

The following describes the SBB identification label nouns and symbols:
1. Order Number is the type of SBB.
2. Capacity is the total amount of data the device stores.
3. SCSI Logical Unit Number is assigned by the user.
4. SCSI ID is assigned by the user.
5. Controller Channel Number is assigned by the user.
6. Device Bus Width is either narrow (N) or wide (W):
N is a 8-bit device
W is a 16-bit device
7. Device Bus Compatibility is the type of shelf in which the device
functions.
N - the device is 8-bit shelf compatible.
W - the device is 16-bit shelf compatible.
N/W - the device is compatible with either shelf.
8. Bus Bit Rate in Mbits is the speed of the bus:
S - Slow device (5 Mb/s)
F - Fast device (10 Mb/s)
10 is Mbits per second.
9. Transfer Rate in MB is the data transfer rate in MBytes per second.

StorageWorks Replacement Procedures 3–3

3.1.2 Replacing an SBB
Use the following procedure to remove or replace an SBB:
___________________________ CAUTION _________________________
Be sure that the replacement device is the same model as the one being replaced.
When removing or replacing an SBB, always use both hands to support the weight
of the SBB.
______________________________________________________________
___________________________ CAUTION _________________________
Touching the SBB connector can cause electrostatic discharge (ESD) damage to
the SBB.
______________________________________________________________
1.

Press the two mounting tabs together to release the SBB (see Figure 3-2).

Use both hands and pull the SBB out of the shelf.

Insert the replacement SBB into the guide slots and push it in until it is fully seated and
the mounting tabs engage the shelf.

After power is applied, observe the status LEDs for the following indications:
•

On a power SBB, both green status LEDs should be on.

•

On a storage SBB, the green device activity LED is either on, flashing, or off. The
amber device fault LED is off.

•

On a battery backup unit SBB, the amber charge status LED is on.

Figure 3-2 Removing an SBB from the Shelf

CXO-4439A-MC

3–4 StorageWorks Replacement Procedures

3.1.3 Replacing the I/O Module
Use the following procedure to remove the I/O module (see Figure 3-3):
___________________________ CAUTION _________________________
Be sure that the I/O module is the same model as the one being replaced.
______________________________________________________________
Figure 3-3 Removing the I/O Module from the Shelf

UPPER
MOUNTING
TAB

BUS ADDRESS
SWITCH
JA1

LOWER
MOUNTING
TAB

JB1

CXO-4427A-MC

Loosen the two captive screws on the lower cable connector JB1 and remove the cable
from the I/O module.

Press the two mounting tabs together and pull forward to release the module.

Pull the I/O module partially out of the shelf.

Loosen the two captive screws on the upper cable connector JA1 and remove the cable
from the I/O module.

Pull the module out of the shelf.

Set the bus address switches on the replacement I/O module to match the settings on the
removed I/O module (refer to section 2.5).

StorageWorks Replacement Procedures 3–5

___________________________ CAUTION _________________________
To prevent system failure, install the replacement module with the lower
mounting tab on the bottom of the shelf (see Figure 3-3).
______________________________________________________________
7.

Insert the replacement module into the guide slots and push it partially into the shelf.

Insert the upper cable connector JA1 and tighten the two captive screws.

Push the module into the slot until it is fully seated and the lower mounting tab engages
the shelf.

10. Insert the lower cable connector JB1 and tighten the two captive screws.
11. When power is applied, make sure that the I/O module status LEDs light and then go off.

3.2 Replacing a Blower Assembly
Each StorageWorks shelf has blowers mounted on the rear. Connectors on the backplane
provide the +12 V dc of power to operate the blowers. When a blower fails, the shelf status
(upper) LED on the power SBB is OFF and an error message is passed to the controller or
host via the shelf status signal. The remaining blower automatically switches to high speed
and the I/O module status LEDs indicate which blower has failed (see Figure 2-5).
__________________________ WARNING _________________________
Service procedures described in this guide 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 one of the following procedures to replace a blower (see Figure 3-4).
_____________________________ Note ___________________________
Be aware that the blowers on this shelf are dual speed blowers and should be
replaced only with dual speed blowers.
______________________________________________________________
___________________________ CAUTION _________________________
Shelf air flow is lost when a blower is removed. Replace the blower immediately
or damage can result.
__________________________________________________________________
If you CAN access the blowers, proceed as follows:
1.

Use a Phillips screwdriver to remove the safety screw (see Figure 3-4).

Press the upper and lower blower mounting tabs together to release the blower.

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

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

3–6 StorageWorks Replacement Procedures

Insert the safety screw.

Verify that the shelf and all SBBs are operating properly by observing the LEDs.

If you CANNOT access the blowers, proceed as follows:
1.

If you cannot access the rear of the shelf, remove the shelf as described in Section 3.3.1.

Use a Phillips screwdriver to remove the safety screw.

Press the upper and lower blower mounting tabs together to release the blower.

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

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

Insert the safety screw.

Install the shelf as described in Section 3.3.2.

Verify that the shelf and all SBBs are operating properly by observing the LEDs.
_____________________________ Note ___________________________
If the I/O module status LEDs are not off and the all shelf power supplies are
operating, the second blower could have failed or the wrong blower was replaced.
______________________________________________________________

Figure 3-4 Replacing a Blower Assembly

CONNECTOR

PHILLIPS
SCREW

BLOWER 2

MOUNTING
TAB

BLOWER 1

GUIDE

PHILLIPS
SCREW
CXO-5085A-MC

StorageWorks Replacement Procedures 3–7

3.3 Replacing a StorageWorks Shelf
The procedures for removing or replacing any StorageWorks shelf are basically the same. The
major differences are the shelf orientation and the type of enclosure or cabinet in which the
shelf is mounted. Normally, a shelf is removed only to replace a blower.
Installing an additional shelf is not within the scope of this guide. Detailed instructions for
installing a shelf in a cabinet are contained in the cabinet installation guide.

3.3.1 Removing a Shelf
All shelves, except those mounted in a deskside expansion unit, 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.

Disconnect the power cords to remove shelf power.

Record the location of the storage devices in the shelf before removing the SBBs.

Record the location of the controller interface cables before removing.

Record the location of the SCSI cables before removing.

Remove the I/O module (refer to Section 3.1.3, steps 1 through 5).

Remove the SBBs.

Remove both the front locking brackets.
__________________________ WARNING _________________________
A shelf with devices in all slots weighs approximately 15 kilograms (33 pounds).
Be sure to fully support the weight of the shelf with both hands at all times to
protect yourself and avoid damaging the devices.
______________________________________________________________

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

3.3.2 Installing a Shelf
Complete the following procedure to install a shelf:
1.

Install the SHELF_OK jumpers (refer to Section 2.1.3).

Orient the shelf and carefully slide it into the mounting brackets.

When it is fully seated, install the front locking brackets.

Install each SBB, controller, or cache memory in the same slot from which it was
removed and connect the power cords.

Install the I/O module (refer to Section 3.1.3, steps 6 through 11).

Connect each controller interface cable to the same connector from which it was removed.

Make sure that the shelf, power supplies, and all devices are functioning properly.

If you replaced a shelf blower, make sure that both blowers are functioning properly.

3–8 StorageWorks Replacement Procedures

4
Power
This chapter describes the StorageWorks power units and power configuration rules. Each of
the StorageWorks power units are mounted in 3.5-inch SBBs.
Listed below are the types of StorageWorks power units:
•

Universal ac input power supply

•

Universal dc input power supply

•

BBU

4.1 Shelf Power Configuration Rules
The rules for configuring the StorageWorks shelves are as follows:
•

Each shelf requires either an ac or dc shelf power supply.

•

Each power supply supports a maximum of seven 3.5-inch SBBs.

•

The shelf power supply must be mounted in slot 7 (the power slot) of the shelf.

•

Either an optional redundant power supply or an optional BBU can be mounted in slot 6.

•

Both ac and dc power supplies are used in the same shelf as either the shelf power supply
or the redundant power supply.

Table 4-1, Table 4-2, and Table 4-3 describe the StorageWorks power units, dc power
requirements, and the receptacle wiring for each shelf, respectively.
___________________________ CAUTION _________________________
Only the power units listed in Table 4-1 are used in the StorageWorks product
line. The power units pose no safety hazard to personnel during their
replacement, provided that the configuration rules described in section 4.1 are
followed exactly.
______________________________________________________________

Power 4–1

Table 4-1 StorageWorks Power Units
Item

Description

BA35X–HC

Battery Backup Unit
Quantity
Input:
Output:

BA35X–HF

Maximum of one per BA356 shelf
+12 V dc from BA35X–HA or BA35X–HB
+12 V dc, +5 V dc
200 W peak, internal selection for 16, 32, or
64 seconds

Power Factor Correcting ac input power supply
Quantity
Input:

Maximum of two per BA356 shelf
90-132 V ac or 175-264 V ac, 47-63 Hz
(autoranging, power factor correcting)
150 W, +12 V dc, +5 V dc

Output:
BA35X–-HG

Universal dc input power supply
Maximum of two per BA356 shelf
38-60 V dc (nominal 48 V dc)
150 W, +12 V dc, +5 V dc

Quantity
Input:
Output:

Typical power requirements for StorageWorks SBBs and blowers are listed in Table 4-2.
These requirements are based on sequential SBB spin-up.
___________________________ CAUTION _________________________
If sequential device spin-up is less than 4 seconds, the power supply rating is
exceeded and system operation is impaired.
______________________________________________________________
Table 4-2 Typical SBB DC Power Requirements
Steady State
Device

+5 V dc

+12 V dc

Spin-Up
+5 V dc

+12 V dc

3.5-inch SBB

9.6 W

24.0 W

5.25-inch SBB

12 W

28.8 W

12 W

72.0 W

Blower

N/A

7.2 W

N/A

7.2 W

The power available for original equipment manufacturers (OEM) devices depends upon the
device power requirements and power supply type used.

4–2 Power

4.2 Universal AC and DC Input Power Supplies
Shelf and power supply status are displayed on the power supply LEDs shown in Figure 4-1.
A complete description of the status signals generated by the shelf and power supply is
contained in Table 2-2 and Table 2-3.
•

The upper LED indicates shelf status.

•

The lower LED indicates power supply status.

Figure 4-1 Power Supply Status LEDs

POWER BUS
STATUS LED
(GREEN)
POWER SUPPLY
STATUS LED
(GREEN)

CXO-4787A-MC

Power 4–3

4.3 Battery Backup Unit
The LEDs on the BBU, shown in Figure 4-2, display the status of the BBU. The valid states
of these LEDs are listed in Table 2-4.
•

The upper LED (green) is the BBU status LED.

•

The lower LED (amber) is the charge status LED.

To remove power from a 16-bit shelf and prevent the BBU from supplying power to the shelf,
push the BBU disable switch (see Figure 4-2) and remove the power.
_____________________________ Note ___________________________
You must remove power within 5 seconds of pressing the BBU
disable switch to prevent the battery from discharging.
______________________________________________________________

Figure 4-2 BBU LEDs

BBU STATUS
(GREEN)
CHARGE
STATUS
(AMBER)
BBU
DISABLE

CXO-4458A-MC

4.4 Power Supply Replacement
To remove power from a single power supply, you simply disconnect the power cable from
that power supply.
There are three methods for replacing power units: hot swap, warm swap, and cold swap
(refer to Section 3.1 for a detailed explanation for these methods). Digital recommends that
you use the warm swap method whenever operational requirements permit.

4–4 Power

4.4.1 Replacing a Shelf Power Supply
Complete the following procedure to replace either a shelf power supply or a redundant power
supply:
_____________________________ Note ___________________________
Use both hands when removing or replacing an SBB to fully support its weight.
______________________________________________________________
1.

Remove the input power cable from the shelf power supply.

Press the two mounting tabs to release the SBB, and slide the SBB out of the shelf, as
shown in Figure 4-3.

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

Connect the input power cable to the shelf power supply.

Observe the LEDs and make sure the supply is functioning properly (refer Section 2.2).

If the shelf power is removed during power supply replacement, the controller must place
the storage devices on-line sequentially at 4-second intervals. Make sure the LEDs on
both the power supply and the storage device indicate normal operation.

Figure 4-3 Removing an SBB from a Shelf

CXO-4439A-MC

4.4.2 Replacing a BBU
To replace a BBU in slot 6, complete the following procedure:
___________________________ WARNING ________________________
Use both hands when removing or replacing an SBB to fully support its weight.
______________________________________________________________
1.

Press the two mounting tabs to release the SBB, and slide the SBB out of the shelf.

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

Observe the LEDs and make sure the BBU is charging as specified in Section 2.2. The
BBU should be fully charged in approximately 1 hour.

Power 4–5

4.5 Power Cords and Cables
Each BA35X–HF and BA35X–HG universal input ac power supplies require an individual ac
power cord that is compatible with an International Electronic Committee (IEC) C–14
shrouded ac receptacle connector. These cords are part of the enclosure and are listed in the
enclosure documentation.
Each BA35X–HB universal input dc power requires an individual dc power cable that has a
plug receptacle and six female pins. Molex connector (part number 39-01-2060) mates with
Molex connector (part number 39-00-0055). Table 4-3 describes the receptacle wiring.
Table 4-3 Power Receptacle Wiring

4–6 Power

Pin No.

Signal

Pin No.

+48 V dc

Signal

BAT_STAT H

Not used

ENABLE H

SIGNAL RTN

+48 V dc RTN

5
StorageWorks SCSI Buses
This chapter describes the SBB shelf SCSI buses, including bus lengths, terminators, jumpers,
and component locations.
___________________________ WARNING ________________________
Service procedures described in this guide 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.
______________________________________________________________
Each BA356 shelf requires one of the following for a SCSI connection:
•

I/O module

•

I/O module and a DWZZB–VW

•

DWZZB–VW and a termination module

A BA356 shelf with a 8-bit I/O module has the following:
•

Two 50-pin, high-density, female, single-ended, SCSI–2 connectors: JA1 (upper) and
JB1 (lower)

•

Either one or two SCSI buses, as determined by the jumper board location and the
optional terminator board

A BA356 shelf with a 16-bit I/O module has the following:
•

Two 68-pin, high-density, female, single-ended, SCSI–3 connectors: JA1 (upper) and
JB1 (lower)

•

Either one or two SCSI buses, as determined by the jumper board location and the
optional terminator board

StorageWorks SCSI Buses 5–1

5.1 Assigning Device Addresses
There is no device address switch on a 16-bit, 3.5-inch SBB. The BA356 shelf and the I/O
module bus address switch automatically set the device address (Refer to Figure 5-1 and
Table 5-1).
The 8-bit device address switches are located on the rear of some SBBs. Use the following
rules to assign device addresses to 8-bit SBBs (disk drives, tape drives):
All 8-bit SBB devices in a 16-bit shelf must be assigned to addresses 0 to 6.
1.

Each device address is used once on a SCSI bus.

Each device address is used once on an SBB shelf unless the shelf has multiple buses, the
SBBs have device address switches, and a I/O module is installed.

An SBB has a six or an eight position device address switch. In all cases, the following is
true:
•

Switch positions 1, 2, and 3 set the device SCSI address.

•

Switch positions 4, 5, and 6 disconnect the device address input from
the backplane SCSI address setting.
Switch positions 7 and 8 are unused.

•
4.

A 5.25-inch SBB can contain one full-height (FH), two half-height (HH) or three thirdheight (TH) devices. Use the following guidelines to set the device addresses on a 5.25inch SBB with either two HH or three TH devices installed (see Figure 5-1).
•

Use the right switch to set the lower device address.

•

Use the middle switch to set the middle device address.

•

Use the left switch to set the upper device address.

Before installing the SBB in the shelf, set the device address switches on the rear of the
SBB to one of the addresses shown in Table 5-1.

5–2 StorageWorks SCSI Buses

Figure 5-1 SBB Device Address Switches
5 1/4" SBB

3 1/2"
SBB

ICE

VIC

UPPER DEVICE
ADDRESS SWITCH

LOWER DEVICE
ADDRESS SWITCH
MIDDLE DEVICE
ADDRESS SWITCH

1 2 3 4 5 6 7 8

CXO-4179B-MC

Table 5-1 SBB Device Address Switches
Switch Number
Address

OFF

Automatic†

* Normally reserved for the host.
† Default setting; address is defined by the shelf connector.

StorageWorks SCSI Buses 5–3

_____________________________ Note ____________________________
Only the middle switch is installed when there is a FH 5.25-inch device or only
one HH or TH 5.25-inch device in a 5.25-inch SBB.
______________________________________________________________
•

To use the default shelf device address, set the switches to the automatic setting as shown
in Table 5-1.

•

The maximum number of device addresses per StorageWorks BA356 shelf is 7 for a
single shelf or 14 for two shelves.

•

The SBB device address for 3½-inch disk SBBs is determined automatically by its
physical location in the shelf and the I/O module bus switch setting.

•

When there is no address switch or the switch is set to automatic, the shelf backplane
connector and the I/O module switch settings determine the SCSI device address. For
example, in a single shelf configuration:
- If the SBB is in slot 5, the device address is 5.
- If the SBB is in slot 3, the device address is 3.

5–4 StorageWorks SCSI Buses

5.2 16-Bit I/O Module
The 16-Bit I/O module is located on the right side of the shelf next to slot 0 (see Figure 5-2).
Figure 5-2 BA356 Shelf with 16-Bit I/O Module

CXO-4319A-MC

On the front of the I/O module (see Figure 5-3) is a seven-position bus address switch and two
68-pin female connectors: bus connector JA1, the data input connector and bus connector JB1,
the data output connector.
Guides are embossed on the top and bottom of the I/O module to conform to slots built into the
top and bottom of the shelf slot, that permit centering the module in the shelf slot. Two
spring-steel mounting tabs lock into ledges molded into the top and bottom of the shelf secure
the I/O module. Squeeze the mounting tabs together to pull the I/O module out of the shelf
slot.
There are also six small slots in the chassis, three on each side of JB1. Behind two of these
slots are the blower fault indicators. Behind the upper slot is the left blower fault LED and
behind the lower slot is the right blower fault LED. Fans at the rear of the shelf draw air from
the front to cool the I/O module.

StorageWorks SCSI Buses 5–5

Figure 5-3 16-Bit I/O Module Features
CHASSIS

BUS
ADDRESS
SWITCHES
BACKPLANE
CONNECTOR

BUS
CONNECTOR
JA1
UPPER
MOUNTING
TAB

BUS
CONNECTOR
JB1

LEFT BLOWER
FAULT LED
(BEHIND SLOT)
RIGHT BLOWER
FAULT LED
(BEHIND SLOT)

LOWER
MOUNTING
TAB

CXO-4507A-MC

5.2.1 Address Switches
The shelf address switch sets single and dual-shelf configurations. A single shelf supports up
to 7 devices, while a dual-shelf supports up to 14 installed devices.
5.2.1.1 Single Shelf Address Configuration
When one shelf is used, all switch positions are set to OFF, regardless of the number of
installed devices. Disk addresses are set from 0 to 6 right to left on the shelf (see Figure 5-4).
Figure 5-4 Single-Shelf Address Configuration
SLOT 7

SLOT 6 SLOT 5 SLOT 4

PERSONALITY
SLOT 3 SLOT 2 SLOT 1 SLOT 0 MODULE

OR
POWER
SUPPLY

POWER
SUPPLY
OR
BBU

ID 5

ID 4

ID 3

ID 2

ID 1

1 2 3 4 5 6 7

ID 6

ID 0

CXO-4320A-MC

5.2.1.2 Dual-Shelf Address Configuration
When two shelves are used, the switch positions are set to OFF on the first shelf. The first
three switches on the second shelf are set to ON for addresses 8 to 14, thereby providing the
two shelves with up to 14 installed devices (see Figure 5-5).

5–6 StorageWorks SCSI Buses

Figure 5-5 Dual-Shelf Address Configuration
SLOT 7

SLOT 6 SLOT 5 SLOT 4

PERSONALITY
SLOT 3 SLOT 2 SLOT 1 SLOT 0 MODULE

ID 4

ID 3

ID 2

ID 1

ID 0

ID 13

ID 12

ID 11

ID 10

ID 9

ID 8

ID 14
OR
POWER
SUPPLY

POWER
SUPPLY
OR
BBU

ID 5

POWER
SUPPLY
OR
BBU

1 2 3 4 5 6 7

POWER
SUPPLY

1 2 3 4 5 6 7

ID 6
OR

CXO-4321A-MC

The terminator in the shelf 1 I/O module is automatically disabled if a SCSI cable is
connected to the JB1 connector on the front of the module, and is attached to a standard SCSI
device at the other end. This daisy chain permits configuration of two shelves with the
termination provided in the second shelf.
_____________________________ Note ___________________________
In dual shelf configuration, the connecting cable to the host computer or controller
should be a maximum of 1 meter long, to maintain error-free operation at 10
MegaTransfers/sec. Longer cables can be used if the bus speed is reduced.
______________________________________________________________

StorageWorks SCSI Buses 5–7

5.3 SCSI Bus Length and Termination
There are three important considerations for all SCSI buses. The first two considerations are
the shelf jumper and the terminator. Each bus requires a terminator, whether internal to the
I/O module or a separate terminator. Figure 5-6 shows the backplane location for the jumper
and the optional terminator. The jumper (J) and terminator (T) connectors are mounted on
the rear of the backplane.
The third consideration is to make sure that the host controller is configured to provide termpower for SCSI operation. Either install a jumper on the controller to enable term-power or
use the software setup utility to enable term-power. (For further information, refer to the
applicable controller installation documentation.)
Figure 5-6 16-Bit Backplane Termination
SLOT 6
JUMPER
PIN

SLOT 1
JUMPER
PIN

DRIVE OR
DWZZB

SLOT 6
TERMINATOR
PIN

SLOT 1
TERMINATOR
PIN
CXO-4327A-MC

When installed, the terminator or jumper position can be determined from the front of the
shelf by removing the SBBs in slot 1 and 6. An indicator pin protruding through the
backplane in the T position in the bottom of the slot indicates a terminator is installed in that
position. An indicator pin protruding through the J position in the top of the slot indicates a
jumper is installed in that position.
_____________________________ Note ___________________________
The terminator module is used in a dual bus configuration or when using a
DWZZB–VW without a I/O module.
______________________________________________________________
When configured as a single bus, a jumper module is required in slot 6 and the shelf
termination is provided in the I/O module at the end of the bus. When configured as a dual
bus, the optional terminator module is required in slot 6.
The I/O module terminator is automatically disabled when a cable is connected between the
I/O module JB1 and a SCSI controller or second shelf.
Table 5-2 defines the maximum lengths of StorageWorks SCSI buses as measured between the
two bus terminators. All bus lengths are rounded off to the nearest tenth of a unit.

5–8 StorageWorks SCSI Buses

Table 5-2 SCSI Bus Parameters
Bus Type

Mega Transfer
per second

Mega B/S

3.0

9.8

25.0

82.0

16-bit, single-ended

Length
Meters
Feet

Supported
Shelves

16-bit, differential with a DWZZB–VW
* Cable connected in front of DWZZB–VW

See section 5.5 for a detailed discussion of shelf SCSI bus lengths.
The total length of the SCSI bus is critical. The components of bus length are as follows:
•

Shelf backplane

•

Controller backplane

•

SCSI cables connecting the host, or controller, and the BA356 shelf

The 1 meter length of the SBB shelf SCSI bus is measured from the input connector JA1 to
the bus terminator in the I/O module.
_____________________________ Note ___________________________
Adding or removing devices to a shelf does not change the length of the shelf bus.
The only way to change the length of the shelf SCSI bus is to remove the jumper
module and reconfigure as a dual bus.
______________________________________________________________

5.4 SCSI Bus Cables
The input and output cables on the SCSI bus connect to the two connectors on the front of the
I/O module. The upper connector JA1 is a 68-pin, high density, female, input connector. The
lower connector JB1 is a 68-pin, high density, female, output connector (refer to Figure 5-3).
In dual bus configurations, JB1 functions as an input connector to the second bus.
There are two cable variations available:
1.

High density cable with a 68-pin, right angle connector on each end (see Table 5-3).

High density cable with a 68-pin, right angle connector on one end and a 68-pin, standard
connector on the other (see Table 5-4).

StorageWorks SCSI Buses 5–9

_____________________________ Note ___________________________
Do NOT exceed the maximum 3 meter bus length.
______________________________________________________________
Table 5-3 BN21L, 68-Pin High Density, Right Angle Connector Cable
Cable Description

Meters

Feet

Order No

CXO-4172A-MC_R

Standard cable, 68-conductor with two 68-pin, high density, right-angle connectors with screw fasteners.

0.3
0.5
1.0
2.0
3.0
5.0
10.0
15.0
20.0

0.5
1.6
3.3
6.5
9.8
16.4
32.8
49.2
65.6

BN21L–0B
BN21L–0E
BN21L–01
BN21L–02
BN21L–03
BN21L–05
BN21L–10
BN21L–15
BN21L–20

Table 5-4 BN21K-68-Pin, High Density, Standard to Right Angle Connector
Cable
Cable Description

Meters

Feet

Order No

CXO-4171A-MC_R

Standard cable, 68-conductor with the following
connectors:
One 68-pin, high-density, male, straight connector
with jackscrew (thumbscrew) fasteners
One 68-pin, high-density, male, right-angle connector
with screw fasteners

5–10 StorageWorks SCSI Buses

1.0
1.5

3.3
4.9

BN21K–01
BN21K–1E

2.0
3.0

6.5
9.8

BN21K–02
BN21K–03

5.0
8.0
10.0
15.0
20.0
23.0

16.4
26.2
32.8
49.2
65.6
75.5

BN21K–05
BN21K–08
BN21K–10
BN21K–15
BN21K–20
BN21K–23

5.5 Shelf SCSI Bus Configurations
Prior to shipment, the SBB shelf SCSI buses are configured to meet system requirements in
one of the following ways:
_____________________________ Note ___________________________
Bus address switch settings other than those shown in Figure 5-8, Figure 5-10 and
Figure 5-12 can cause SCSI bus conflicts.
______________________________________________________________
•

A single bus with seven device addresses on one shelf

•

Two buses with four device addresses on one bus and three device addresses on the other

•

Dual shelf on a single bus with seven device addresses per shelf.

You 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 StorageWorks Solutions
Product Catalog.
_____________________________ Note____________________________
The length of a shelf SCSI bus is the distance from the input connector to the
terminator on the shelf.
______________________________________________________________
Table 5-5 lists the standard factory SCSI bus configurations and defines the bus lengths.
Table 5-5 StorageWorks Bus Lengths
Single Shelf–DWZZB
Shelf

Bus

Input

Slot 6

Slot 1

Meters

Feet

JA1

Jumper

None

1.0

3.3

POWER

DWZZB-VW

(7)

JA1
7-DEVICE BUS INPUT
BUS LENGTH: 1 m (39.4 in)
AUTO TERMINATOR
JB1
CXO-4407A-MC

StorageWorks SCSI Buses 5–11

Single Shelf–Single Bus
Shelf

Bus

Input

Slot 6

Slot 1

Meters

Feet

JA1

Jumper

None

1.0

3.3

JA1

POWER

7-DEVICE BUS INPUT
BUS LENGTH: 1.0 m (39.4 in)
6

(7)

JB1

AUTO TERMINATOR

CXO-4513A-MC

Single Shelf–Two Buses
Shelf

Bus

Input

JA1

JB1

Slot 6

Slot 1

Terminator

Jumper*

Meters

Feet

0.4

1.3

0.6

2.0

* The jumper is placed here for safekeeping and has no effect on the SCSI bus.

JA1
POWER

4-DEVICE BUS INPUT
BUS LENGTH: 0.6 m (23.6 in)
6 T 5

(7)

JB1

3-DEVICE BUS INPUT
BUS LENGTH: 0.4 m (16.4 in)

TERMINATOR
MODULE
CXO-4514A-MC

Two Adjacent Shelves–Single Bus
Shelf

Bus

Input

Slot 6

Slot 1

Meters

Feet

JA1

Jumper

None†

1.0‡

3.3‡

JA1

Jumper

None

1.0

3.3

BN21L–0E Cable

0.5

1.6

Total Bus Length

2.5

8.2

‡ From the input connector (JA1) to output connector (JB1).
† Do not install a terminator here.

JA1

J
POWER

SHELF 1

(7)

J
POWER

SHELF 2

(7)

7-DEVICE BUS INPUT
BUS LENGTHS:
SHELF 1: 1.0 m (39.4 in)
JB1
SHELF 2: 1.0 m (39.4 in)
OUT
CABLE: 0.5 m (19.7 in)
TOTAL:
2.5 m (90.6 in)
IN
JA1
AUTO TERMINATOR

JB1
CXO-4515A-MC

5–12 StorageWorks SCSI Buses

5.6 Shelf with a Single SCSI Bus
Figure 5-7 and Figure 5-8 shows an BA356 shelf with a single SCSI bus with seven devices.
Use the following procedure to configure a single BA356 shelf for seven devices on a single
SCSI bus:
1.

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

Remove the blowers as described in section.

Discharge any static build-up by momentarily touching a finger to the I/O module tabs.

Make sure that the SHELF_OK jumpers are installed correctly either on the backplane or
on both the jumper board and the optional terminator board, as described in section 2.2

Install the jumper board in the backplane connector behind slot 6 (see Table 5-5).

Replace the blowers as described in section 3.2.

Connect the SCSI cable to the JA1 connector (refer to section 3.1).

Assign device address and install SBBs (refer to section 5.2).

Connect the power cables to the shelf power supplies.

Figure 5-7 Single Shelf SCSI Bus
J

JA1

POWER

7-DEVICE BUS INPUT
BUS LENGTH: 1.0 m (39.4 in)

(7)

JB1

AUTO TERMINATOR

CXO-4513A-MC

Figure 5-8 Single Shelf Configuration Address
SLOT 7

SLOT 6 SLOT 5 SLOT 4

PERSONALITY
SLOT 3 SLOT 2 SLOT 1 SLOT 0 MODULE

OR
POWER
SUPPLY

POWER
SUPPLY
OR
BBU

ID 5

ID 4

ID 3

ID 2

ID 1

1 2 3 4 5 6 7

ID 6

ID 0

CXO-4320A-MC

StorageWorks SCSI Buses 5–13

5.7 Shelf with a Split SCSI Bus
Use the following procedure to configure a BA356 shelf for a split shelf SCSI bus, one with
three devices and one with four devices, as shown in Figure 5-9:
1.

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

Remove the blowers, as described in section 3.2.

Discharge any static build-up by momentarily touching a finger to the I/O module tabs.

Make sure that the SHELF_OK jumpers are installed correctly on either the backplane or
the jumper board and the optional terminator board as described in section 2.1.3

Install the terminator board in the backplane connector behind slot 6.

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

Replace the blowers as in section 3.2.

Verify the I/O module address switch settings as in Figure 5-10.

Connect the SCSI cable for device addresses 0, 2, 4, and 6 to the JA1 connector.

10. Connect the SCSI cable for device addresses 1, 3, and 5 to the JB1 connector.
11. Install the SBB devices and assign the device addresses as in section 5–2.
12. Connect the power cables to the shelf power supplies.

Figure 5-9 Shelf with a Split SCSI Bus
JA1
POWER

4-DEVICE BUS INPUT
BUS LENGTH: 0.6 m (23.6 in)

(7)

6 T 5

JB1

3-DEVICE BUS INPUT
BUS LENGTH: 0.4 m (16.4 in)

TERMINATOR
MODULE
CXO-4514A-MC

Figure 5-10 Single Shelf Configuration Address
SLOT 7

SLOT 6 SLOT 5 SLOT 4

PERSONALITY
SLOT 3 SLOT 2 SLOT 1 SLOT 0 MODULE

OR
POWER
SUPPLY

POWER
SUPPLY
OR
BBU

ID 5

ID 4

ID 3

ID 2

ID 1

1 2 3 4 5 6 7

ID 6

ID 0

CXO-4320A-MC

5–14 StorageWorks SCSI Buses

5.8 Two Shelves with a Single SCSI Bus
Use the following procedure to configure two SBB shelves with seven devices on one SCSI
bus, as shown in Figure 5-11:
_____________________________ Note____________________________
The maximum number of SBB shelves on a single SCSI bus is two. A maximum
of seven storage SBBs can be installed in each shelf.
______________________________________________________________
1.

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

Remove the blowers as described in section 3.2.

Discharge any static build-up by momentarily touching a finger to the I/O module tabs.

Make sure that the SHELF_OK jumpers are installed correctly either on the backplane or
on both the jumper board and the optional terminator board as described in section 2.1.1.

On the upper shelf, install the jumper board in the backplane connector behind slot 6.

On the lower shelf, install the jumper board in the backplane connector behind slot 6.

Replace the blowers as described in section 3.2.

Verify the I/O module address switch settings as in Figure 5-12.

Connect a BN21L–0E SCSI cable between connector JB1 on the upper shelf and
connector JA1 on the lower shelf.

10. Make sure that each device has a different SCSI address as described in section 5.1.
11. Connect the power cables to the shelf power supplies.
Figure 5-11 Single SCSI Bus on Two Shelves
JA1

J
POWER

SHELF 1

(7)

J
POWER

SHELF 2

(7)

7-DEVICE BUS INPUT
BUS LENGTHS:
SHELF 1: 1.0 m (39.4 in)
JB1
SHELF 2: 1.0 m (39.4 in)
OUT
CABLE: 0.5 m (19.7 in)
TOTAL:
2.5 m (90.6 in)
IN
JA1
AUTO TERMINATOR

JB1
CXO-4515A-MC

StorageWorks SCSI Buses 5–15

Figure 5-12 Dual Shelf Configuration Address
SLOT 7

SLOT 6 SLOT 5 SLOT 4

PERSONALITY
SLOT 3 SLOT 2 SLOT 1 SLOT 0 MODULE

ID 4

ID 3

ID 2

ID 1

ID 0

ID 13

ID 12

ID 11

ID 10

ID 9

ID 8

ID 14
OR
POWER
SUPPLY

POWER
SUPPLY
OR
BBU

ID 5

POWER
SUPPLY
OR
BBU

1 2 3 4 5 6 7

POWER
SUPPLY

1 2 3 4 5 6 7

ID 6
OR

CXO-4321A-MC

5–16 StorageWorks SCSI Buses

5.9 8-Bit I/O Module
This document describes the 8-bit I/O module (see Figure 5-13). It explains how to install the
I/O module in the BA356 shelf, and how to set the shelf small computer system interface
(SCSI) addresses. The basic documentation set for the I/O module is StorageWorks Solutions,
7 Device, 16-Bit SBB Shelf (BA356–S series) User’s Guide (EK–BA356–UG. B01).

Figure 5-13 8-Bit I/O Module

CXO-4821A-MC

The I/O module employs active circuitry to provide the following features to the BA356–SB
SBB shelf:
•
•
•
•
•
•

Eight-bit data bus connections to external units
Shelf device address assignment
Blower speed control
Blower fault indicators
Ambient air overtemperature sensing and indication
Active, automatic bus termination

StorageWorks SCSI Buses 5–17

5.10 Description
The 8-Bit I/O module is located on the right side of the shelf next to slot 0 (see Figure 5-14).
Figure 5-14 BA356 Shelf with 8-Bit I/O Module

CXO-5086A-MC

On the front of the I/O module (see Figure 5-15) are two 50-pin female connectors: bus
connector JA1, the data input connector and bus connector JB1, the data output connector.
Guides are embossed on the top and bottom of the I/O module to conform to slots built into the
top and bottom of the shelf slot, that permit centering the module in the shelf slot. Two
spring-steel mounting tabs lock into ledges molded into the top and bottom of the shelf secure
the I/O module. Squeeze the mounting tabs together to pull the I/O module out of the shelf slot
The upper LED indicates that the left (as viewed from the front of the shelf) blower motor has
failed. The lower LED indicates that the right blower motor has failed. Fans at the rear of the
shelf draw air from the front to cool the I/O module.
Figure 5-15 I/O Module Features

BACKPLANE
CONNECTOR

UPPER
MOUNTING
TAB

BUS
CONNECTOR
JA1

LEFT
BLOWER
FAULT LED

J5
ADDRESS
JUMPER
PRINTED
CIRCUIT
BOARD

RIGHT
BLOWER
FAULT LED

CHASSIS
BUS
CONNECTOR
JB1

LOWER
MOUNTING
TAB
CXO-4536A-MC

5–18 StorageWorks SCSI Buses

5.10.1 Data Bus Connections
The I/O module provides external connection for the two, 16-bit shelf buses. The backplane
connector on the rear of the I/O module (see Figure 5-15) routes the bus and control signals
from the shelf backplane to the I/O module circuits. These circuits connect the lower eight
bits (0 through 7) of bus A to external bus connector JA1 and the lower eight bits of bus B to
external bus connector JB1.

5.10.2 Bus Termination
The I/O module provides both active and passive bus termination for the two, 16-bit shelf
buses. The upper eight bits (8 through 15) of each bus are passively terminated by termination
resistors. These data lines do not pass to the external bus connectors (JA1 and JB1). The
lower eight bits (0 through 7) of SCSI bus B are actively terminated. These data lines are
terminated as long as there is no connection to JB1. If JB1 is connected to a SCSI device, the
active terminators are disabled and these data lines pass through JB1.

5.10.3 Shelf Device Address Assignment
The I/O module determines the SCSI address for each slot in the shelf. This is accomplished
by either installing or not installing the address jumper (J5) on the address pins at the rear of
the I/O module. The location of J5 is shown in Figure 5-15. Shelf slot addresses are
determined as shown in Table 5-6
Table 5-6 Device Address Configurations
Bus Address
Jumper J5

Resultant Device Addresses

Not installed
Installed

Slot 6 → Slot 0
6 5 4 3 2 1 0
6 5 5 3 3 1 1

5.10.4 Swap Control
The I/O module informs the controller when the I/O module is being removed from or inserted
into the shelf, thus allowing a warm swap of the I/O module.

5.10.5 Temperature Control
The I/O module regulates the air temperature in the shelf. Air temperature and motor status
are indicated by the blower fault LEDs (see Figure 5-15). An ambient air temperature
exceeding a preset value causes both blower fault LEDs to light and the blower motors to run
at high speed. This condition does not cause the SHELF_OK LED on the power supply to
light.

5.11 Connecting to External Devices
Bus connectors JA1 and JB1 are used to connect to external SCSI buses. These connectors are
50-pin, high-density, female connectors. The I/O module may be connected as either a single
bus or dual bus configuration.

5.11.1 Single Bus Configuration
Connector JA1 is the input connector. Connector JB1 is either the output connector to another
SCSI device, or it has no connection and the I/O module provides internal bus termination for
the shelf.

StorageWorks SCSI Buses 5–19

5.11.2 Dual Bus Configuration
Connector JA1 is the I/O connector for bus A, which consists of slots 0, 2, 4, and 6 when the
jumper is in place. Connector JB1 is the I/O connector for bus B, which consists of slots 1, 3,
and 5 when the terminator is installed in slot 6 on the rear of the shelf.

5.12 SCSI Bus Cables
The input and output cables on the SCSI bus connect to the two connectors on the front of the
I/O module. The upper connector JA1 is a 50-pin, high density, female, input connector. The
lower connector JB1 is a 50-pin, high density, female, output connector. In dual bus
configurations, JB1 functions as an input connector to the second bus.

5.12.1 BN21H-Series SCSI Single-Ended Cables
he BN21H-Series cables are shown and described in Table 5-7. These cables are typically
used to connect SBB shelves to the following:
•

Other SBB shelves

•

SCSI adapters , such as:

−

KZMSA, an XMI to SCSI adapter

−

PMAZ-AA and PMAZ-AB

−

K.scsi

Table 5-7 BN21H-Series Cables
Cable Description

StorageWorks
CONNECTOR

Standard cable, 50-conductor
Two 50-pin, high-density, male, straight connectors
with thumb latches

5–20 StorageWorks SCSI Buses

Meters

Feet

Order No

CXO-4165A-MC_R

0.3
0.5

1.0
1.6

BN21H–0C
BN21H–0E

1.0
1.5
2.0
3.0
5.0

3.3
4.9
6.6
9.8
16.4

BN21H–01
BN21H–1E
BN21H–02
BN21H–03
BN21H–05

5.12.2 BN21R-Series SCSI Single-Ended Cables
The BN21R-series single-ended cables are shown and described in Table 5-8 . These cables
are typically used to connect a StorageWorks shelf to a 50-pin, low-density receptacle, such as
that used by the DEC 4000 model 610 Alpha distributed/departmental server.
Table 5-8 BN21R-Series Single-Ended Cables
Cable Description

Meters

StorageWorks
CONNECTOR

Adapter cable, 50-conductor
One 50-pin, high-density, male, straight connector
with thumb latches
One 50-pin, low-density, male, right-angle connector

Feet

Order No

CXO-4166A-MC_R

0.5
1.0
2.0
3.0
5.0

1.6
3.3
6.6
9.8
16.4

BN21R–0E
BN21R–01
BN21R–02
BN21R–03
BN21R–05

5.12.3 BN23G-Series SCSI Single-Ended Cables
The BN23G-series cables are sown and described in Table 5-9. These cables allow you to
connect SCSI devices that have different density, 50-pin connectors. The BN23G-series
cables are typically used to connect SBB shelves to SCSI adapter cards in personal computers
and workstations.
Table 5-9 BN23G-Series SCSI Single-Ended Cables
Cable Description

Meters

Feet

Order No

StorageWorks
CONNECTOR
CXO-4167A-MC_R

Adapter cable, 50-conductor
One 50-pin, high-density, straight connector with
thumb latches
One 50-pin, low-density, straight connector with bail
locks

0.5
1
2

1.66
3.3
6.6

BN23G–0E
BN23G–01
BN23G–02

3
5

9.8
16.4

BN23G–03
BN23G–05

StorageWorks SCSI Buses 5–21

5.12.4 BC10U-Series SCSI Single-Ended Cables
The BC10U-series single-ended cables are shown and described in Table 5-10. The BC10Useries cables are used only with Alpha systems with the BA655 SCSI plug-in unit (PIU). Do
not use this SCSI cable in any other configuration. These cables are typically used to connect
SBB shelves to the following:
•

Other SBB shelves

•

KZMSA, an XMI to SCSI adapter

Table 5-10 BC10U-Series SCSI Single-Ended Cables
Cable Description

Meters

StorageWorks
CONNECTOR

Alpha DEC 7000 and DEC 1000 SCSI cable,
50-conductor
Two 50-pin, high-density, male, straight connectors with
thumb latches

Feet

Order No

CXO-4168A-MC_R

2.0
3.0
5.0

6.6
9.8
16.4

BC10U–02
BC10U–03
BC10U–05

5.12.5 BC31B-Series HSC Controller Single-Ended Cable
The BN31B-series HSC controller singled-ended cable is shown and described in Table 5-11.
Table 5-11 BN31B-Series HSC Controller Single-Ended Cables
Cable Description

Meters

StorageWorks
CONNECTOR

HSC controller to StorageWorks shelf cable, 50-conductor
One 50-pin, high-density, male, straight connector
with thumb latches
One 50-pin, high-density, male, straight connector
with thumb screws

5–22 StorageWorks SCSI Buses

Feet

Order No

CXO-4170A-MC_R

2.0
3.0

6.6
9.8

BN31B–02
BN31B–03

5.13 Installing the I/O Module
Use the following procedure to install the I/O module in a shelf (see Figure 5-16):
1.

If necessary, remove an I/O module using the procedure in steps a through c:
a) Press the two mounting tabs together and pull forward to release the I/O module.
b) Pull the I/O module out of the shelf.
c)

Disconnect the cables from the I/O module.

Set the address jumper in one of the following three ways:
•

To match the I/O module removed.

•

For a single bus configuration, do not install the address jumper.

•

For a dual bus configuration, with duplicate addresses on each bus, install the address
jumper. You must also install the active terminator in slot six on the rear of the
backplane.

___________________________ CAUTION _________________________
To prevent system failure, install the I/O module with the I/O module cover facing
to the left (see Figure 5-16).
______________________________________________________________
3.
4.

Insert the 50-pin cable connectors into JA1 and JB1.
Push the module into the shelf slot until it is fully seated and both
mounting tabs engage the shelf. There is an audible snap when this
occurs.
When the power is applied, verify that the I/O module status LEDs light
and then go off.

StorageWorks SCSI Buses 5–23

Figure 5-16 Installing the I/O Module

UPPER
MOUNTING
TAB
I/O MODULE
COVER

JA1
JB1

LOWER
MOUNTING
TAB
CXO-4822A-MC

5–24 StorageWorks SCSI Buses

6
StorageWorks Product Specifications
This section describes the physical and environmental specifications for the StorageWorks
products. See the Digital Systems and Options Catalog for the operating specifications for
storage devices, controllers, and host computers.

6.1 Input Power Requirements
The input power requirements for a StorageWorks enclosure are determined by the number of
shelves, the enclosure power supplies, the fans, and other features.

6.2 Power Supplies
Each StorageWorks shelf requires an ac or dc power supply. The power supply type is
determined by the enclosure power system, either ac or 48 V dc.
All shelves can have a redundant power supply to make sure that a power supply failure does
not disable the shelf. In some cases, BBUs are combined with the shelf power supply to
provide extended system data integrity.
Table 6-1 shows the specifications for the StorageWorks power supplies: and the BA35X–HG.
___________________________ CAUTION _________________________
If sequential device spin-up is less than 4 seconds, the power supply rating is
exceeded and system operation is impaired.
______________________________________________________________
Table 6-1 StorageWorks Power Supplies
Specifications

BA35X–HC

BA35X–HF

BA35X–HG

Power supply type

Battery backup

Power Factor
Correcting ac
input

dc input

Input voltage range

N/A

90-264 V ac

36-72 V dc

Input voltage, nominal

12 V dc
(Charging from
shelf power bus)

101, 120, 220,
240 ac

48 V dc

Auto–ranging feature

N/A

Yes

Output voltages

12 V dc
5 V dc

Output power
(Sequential device spinup at 4-second interval
mandatory)

200 W peak
power for 16, 32,
or 64 seconds

150 W

StorageWorks Product Specifications 6–1

6.3 Physical Specifications
Table 6-2 lists the physical specifications of the cabinets, StorageWorks shelves, and SBBs.
Table 6-2 StorageWorks Products Physical Specifications
Height
Description

Width
mm

Depth
in

Total
Shelves

StorageWorks Enclosures
SW500-series data center
cabinet

1070

42.1

600

23.6

875

34.5

SW800-series data center
cabinet

1700

66.6

800

31.5

875

34.5

Deskside expansion enclosure

578

22.8

203

8.0

400

15.7

Desktop expansion enclosure

2.4

432

17.0

400

15.7

N/A

BA350–EA controller and SBB
shelf

300

11.8

445

17.5

350

13.8

N/A

BA350–LA SBB shelf

150

5.9

445

17.5

350

13.8

N/A

StorageWorks Shelves

BA350–SA SBB shelf

150

5.9

445

17.5

350

13.8

N/A

BA350–MA controller shelf

150

5.9

445

17.5

350

13.8

N/A

150

5.9

445

17.5

350

13.8

N/A

BA356–SB shelf

StorageWorks Building Blocks
3.5-inch SBB

121

4.8

2.0

216

8.5

N/A

5.25-inch SBB

121

4.8

152

6.0

267

10.5

N/A

6–2 StorageWorks Product Specifications

6.4 Environmental Specifications
The StorageWorks product line environmental specifications listed in Table 6-3 are the same
as for other Digital storage devices.
Table 6-3 StorageWorks Environmental Specifications
Condition

Specification
Optimum Operating Environment

Temperature
Rate of change
Step change

+18 C to +24 C (+65 F to +75 F)
3 C (5.4 F)
3 C (5.4 F)

Relative humidity

40% to 60% (noncondensing) with a step change of 10% or less
(noncondensing)

Altitude

From sea level to 2400 m (8000 ft))

Air quality

Maximum particle count .5 micron or larger, not to exceed 500,000
particles per cubic ft of air

Inlet air volume

.026 cubic m per second (50 cubic ft per minute)
Maximum Operating Environment (Range)

Temperature

+10 to +40 C (+50 to +104 F)
Derate 1.8 C for each 1000 m (1.0 F for each 1000 ft) of altitude
Maximum temperature gradient 11 C/hr (20 F/hr) ± 2 C/hr (4 F/hr)

Relative humidity

10% to 90% (noncondensing)
Maximum wet bulb temperature: 28 C (82 F)
Minimum dew point: 2 C (36 F)
Maximum Nonoperating Environment (Range)

Temperature

-40 to +66 C (-40 to +151 F) (during transportation and associated
short-term storage)

Relative humidity
Nonoperating

8% to 95% in original shipping container (noncondensing); otherwise,
50% (noncondensing)

Altitude

From 300 m (-1000 ft) to +3600 m (+12,000 ft) MSL

StorageWorks Product Specifications 6–3

6.5 Environmental Stabilization
To make sure of the proper operation of Digital storage devices, the SBB temperature must be
within 18-29°C (65-85°F). Table 6-4 specifies the time required to thermally stabilize SBBs
based on the ambient shipping temperature.
___________________________ CAUTION __________________________
Always stabilize storage devices in the operating environment prior to installation
or operation. Otherwise, the media or associated electronics can be damaged
when power is applied to the unit.
______________________________________________________________

If This Condition Exists …

Then You Must …

Condensation is visible on the outside of
the storage device

Stabilize the device and the SBB in the operating
environment for 6 hours or until the condensation is no
longer visible, whichever is longer. Do not insert the
storage device into the shelf until it is fully stabilized.

Condensation is not visible on the
outside of the storage device

Thermally stabilize the device for the amount of time
specified in Table 6-4.

Table 6-4 Thermal Stabilization
Storage
Temperature
Range C

Storage
Temperature
Range F

Minimum
Stabilization
Time

60 to 66

140 to 151

3 hours

50 to 59

122 to 138

2 hours

40 to 49

104 to 120

1 hour

30 to 39

86 to 102

30 minutes

18 to 29

64 to 84

None

10 to 17

50 to 63

30 minutes

0 to 9

32 to 48

1 hour

-10 to -1

14 to 30

2 hours

-20 to -11

-4 to 12

3 hours

-30 to -21

-22 to -6

4 hours

-40 to -31

-40 to -24

5 hours

6–4 StorageWorks Product Specifications

Glossary
adapter
See SCSI bus signal converter.
Battery backup unit
See BBU.
BBU
Battery backup unit. StorageWorks power unit option that extends power availability after the
loss of primary ac power, or a power supply to protect against the corruption or loss of data.
_____________________________ Note ___________________________
The BBU does not provide power for the operation of a storage device. It provides
power only for protecting data.
______________________________________________________________
building block shelf
See SBB.
cold swap
A method of device replacement that requires that power be removed from one or more
shelves in a cabinet. 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 used only 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 and SBB shelf
A generic reference to a StorageWorks shelf that can contain both controller SBBs and storage
SBBs (for example, a BA350–EA shelf).
Controller shelf
Any StorageWorks shelf that contains only controllers and cache memories (for example, a
BA350–MA shelf).
daisy chain
Two or more StorageWorks shelves that are connected.
deskside expansion unit
The StorageWorks floor mounted stand that encloses a BA356–SB SBB shelf.

Glossary−1

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.
DWZZB
A StorageWorks compatible SCSI bus signal converter.
See SCSI bus signal converter.
electrostatic discharge
See ESD.
ESD
Electrostatic discharge is 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.
half-height
(1) In the storage industry, a device of conventional dimensions, except for height. (2) A
device that occupies only one-half of a 5¼-inch SBB. The first half-height device is always
mounted in the lower (bottom) part of the SBB. The second device in an SBB is mounted in
the upper (top) part of the SBB.
host
The primary or controlling computer or any such unit (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.
I/O module
The module (either 8-bit or 16-bit) that interfaces the single-ended SCSI-bus to the SBB shelf.

logical bus
A single-ended, physical bus connected to a differential, physical bus by a SCSI bus signal
converter.

2−Glossary

physical bus
Two SCSI terminators separated by cables, connectors, and/or the backplane circuitry.
RAID
Redundant Array of Independent Disks. A set of storage techniques that increases the
performance and availability of a storage subsystem.
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 3½inch or 5¼-inch carrier is considered to be an SBB, whether it is a storage device, a power
supply, 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 devices. The StorageWorks
subsystem implementation uses SCSI–2 for the transfer of data.
SCSI bus signal converter
Sometimes referred to as an adapter. (1) A connecting device that permits the attachment of
accessories or provides the capability to mount or link units. (2) The device that connects a
differential SCSI bus to a single-ended SCSI bus.
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 15. Also referred to as target ID.
SCSI mid-bus
The physical location of a controller or a device that the SCSI bus passes through enroute to
the controller or device that contains the SCSI bus termination.
SCSI–A cable
A 68-conductor (34 twisted pair) cable used for single-ended, SCSI–3 bus connections.
SCSI–P cable
A 68-conductor (34 twisted pairs) cable used for differential bus connections.
single-ended SCSI bus
A bus in which each signal’s logic level is determined by the voltage of a single wire in
relation to ground.

Glossary−3

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 level enclosures
to house the shelves. Standard mounting devices for SBBs are also included.
StorageWorks building block
See SBB.
tape controller
See controller.
target
A SCSI device that performs an operation requested by an initiator.
target ID
See SCSI device ID.
termpower
Is an electrical current that is limited by self-resetting fuses.
third-height
(1) In the storage industry, a device of conventional dimensions, except for height. (2) A
device that occupies only one-third of a 5¼-inch SBB. The first third-height device is always
mounted in the lower (bottom) part of the SBB. The second device in an SBB is mounted in
the middle (center) part of the SBB. The third device in an SBB is mounted in the upper (top)
part of the SBB.
warm swap
A method of device replacement whereby the complete system remains on line during device
removal or insertion. Activity can 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.

4−Glossary

Index
Ambient temperature range, 6–4
Assigning device addresses, 5–2
BBU
LEDs, 4–4
replacing, 4–5
status, 4–4
BC10U-series SCSI single-ended cables, 5–22
BC31B-series HSC controller single-ended
cables, 5–22
BN21H-series SCSI single-ended cables, 5–20
BN21R-series SCSI single-ended cables, 5–21
BN23G-series SCSI single-ended cables, 5–21
cold swap, 3–1
configuration procedures
single SCSI shelf, 5–13
configuration rules
two SCSI buses, 5–14
configuration rules
single bus, two shelf, 5–15
single SCSI bus, 5–11
two SCSI buses, 5–11
Device address switches, 5–2
Environmental specifications, 6–3
Environmental stabilization, 6–4
hot swap, 3–1
I/O module
shelf address switch, 5–6
I/O Module 16-Bit, 5–5
I/O module 16-bit
SCSI bus two shelves, 5–15
shelf with a split SCSI bus, 5–14
I/O module 8-bit
dual bus configuration, 5–20
SCSI bus
cables, 5–20
single bus configuration, 5–19
swap control, 5–19
temperature control, 5–19
I/O Module 8-Bit, 5–17
I/O module 8-bit
bus termination, 5–19
data bus connections, 5–19
description, 5–18
i/o module 8-bit
connecting to external devices, 5–19
shelf device address assignment, 5–19
installing 8-bit i/o module
Installing a shelf, 3–8
LEDs, 2–3, 2–7
Personality module
addressing, 3–5
bus address switch, 5–5
replacing, 3–5
status, 2–7
Physical specifications
cabinets, 6–2
SBBs, 6–2

shelves, 6–2
Power cords and cables, 4–6
Power requirements, 6–1
power supply
replacement, 4–4
specifications
BA35X–HC, 6–1
power supply
specifications
BA35X–HF, 6–1
Removing a shelf, 3–8
Removing SBBs
procedure for, 3–4
Replacing a blower, 3–6
Replacing a storage device or a power unit, 3–
6
cold swap, 3–1
hot swap, 3–1
warm swap, 3–1
Replacing personality module, 3–5
Replacing SBBs
cold swap method, 3–2
hot swap method, 3–1
procedure for, 3–1
SBBs
device addresses, 5–2
identification label, 3–3
specifications, 3–1
SCSI bus
cables, 5–9
configuration
single bus
single shelf procedure, 5–13
two shelf procedure, 5–15
two bus procedure, 5–14
single shelf, 5–14
description, 5–1
jumper, 5–8
length, 5–8
terminator, 5–8
two SCSI buses, 5–14
SCSI device address, 5–4
Shelf and Power Supply Status
power supply faults, 2–3
power supply LEDs, 2–3
single power supply, 4–3
shelf faults, 2–3
Shelf_OK Signal, 2–1
Shelf power configuration rules, 4–1
Shelf status, 2–1
BBU faults, 2–6
BBU LEDs, 2–6
Shelves
J position, 5–8
physical specifications, 6–2
T position, 5–8
Storage SBB LEDS, 2–4
Index−1

SBB active LED, 2–4
storage fault LED, 2–4
storage SBB faults, 2–4
Storage SBB status, 2–4, 3–1
SBB replacement, 3–1
StorageWorks
components, 1–1
power requirements, 6–1

Index−2

specifications, 6–1
StorageWorks specifications
physical, 6–2
System Building Blocks, 3–1
Temperature ranges, 6–3
Thermal stabilization, 6–4
warmswap, 3–1