Bull DPX/20 Assembly Instructions

014-002518-03
Bull DPX/20
Installing and Maintaining a
150 Disk-Array Storage System
86 A1 12GX 01
ORDER REFERENCE

Bull DPX/20
Installing and Maintaining a
150 Disk-Array Storage System
Hardware
June 1996
Bull Electronics Angers S.A.
CEDOC
Atelier de Reprographie
331 Avenue Patton
49004 ANGERS CEDEX 01
FRANCE
86 A1 12GX 01
ORDER REFERENCE

The following copyright notice protects this book under the Copyright laws of the United States and other
countries which prohibit such actions as, but not limited to, copying, distributing, modifying, and making
derivative works.
Copyright Bull S.A. 1995, 1996
Printed in France
Suggestions and criticisms concerning the form, content, and presentation of
this book are invited. A form is provided at the end of this book for this purpose.
Trademarks and Acknowledgements
We acknowledge the right of proprietors of trademarks mentioned in this book.
ArrayGUIde and GuardWare are trademarks and CLARiiON is a U.S. registered trademark of
Data General Corporation.
AIXRis a registered trademark of International Business Machines Corporation, and is being used under
licence.
UNIX is a registered trademark in the USA and other countries licensed exclusively through X/Open.
This book is derived from the book “Installing and Maintaining a CLARiiONRSeries 100 Disk-Array Storage
System”, Data General Corporation.
The information in this document is subject to change without notice. Groupe Bull will not be liable for errors
contained herein, or for incidental or consequential damages in connection with the use of this material.

Preface iii
Preface
This manual explains how to install the DAS 150 disk-array storage system and how to
replace and/or install customer-replaceable units (CRUs).
It is for technical services personnel who want to install and maintain the storage system. It
assumes familiarity with the computer, called the server, to which the storage system will be
connected.
How this manual is organized
Chapter 1 Introduces the storage system’s components and its connection to the server.
Chapter 2 Describes how to connect a single storage system to the server’s SCSI-2 bus.
Chapter 3 Describes how to connect multiple storage systems to the server(s).
Chapter 4 Describes how to replace or add disk modules and how to replace the other customer-re-
placeable units (CRUs).
Appendix A Lists the technical specifications of the storage system.
Appendix B Lists the available spare parts with their part number.
Related manuals
Within this manual, we refer to the documentation for configuring and managing the
storage system, and for setting up the server for a storage system. See the manual
Configuring and Managing a DAS Disk-Array Storage System (Order Number
86 A2 20 PN).
We also refer to the ArrayGUIde documentation. See the manual Using the ArrayGUIde
Utility to Configure and Manage a DAS Disk-Array Storage System (Order Number
86 A2 13 GX).
Ordering additional copies of this manual
To order additional copies of this manual, use Order Number 86 A1 12 GX.

iv Installing and Maintaining a DAS 150

Preface v
Contents
About the storage system 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage-system components 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCSI-2 adapter 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage-control processor (SP) 1–2. . . . . . . . . . . . . . . . . . . . . . . . . .
Write-cache memory card 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disk-drive modules 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power converters (VSCs) 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan modules 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connection to the server 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic configuration 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dual-initiator configuration 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Factory configuration 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What next 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing a single storage system on a SCSI bus 2–1. . . . . . . . . . . . . . . . . . . . . . . .
Attaching the slot matrix diagram 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SP’s SCSI-2 bus connectors 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the SCSI-bus cable for the storage system 2–2. . . . . . . . .
Setting the SCSI ID for the SP 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the asynchronous (console) cable 2–5. . . . . . . . . . . . . . . .
Connecting the ac power cord 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powering up the storage system 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
What next 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing multiple storage systems on a SCSI bus 3–1. . . . . . . . . . . . . . . . . . . . . . .
Attaching the slot matrix diagram 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCSI-2 bus length 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SP’s SCSI-2 bus connectors 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting SCSI-bus cables for multiple storage systems 3–2. . . . . .
Setting the SCSI ID for the SP 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the asynchronous (console) cable 3–6. . . . . . . . . . . . . . . .
Connecting the ac power cord 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powering up the storage system 3–8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
What next 3–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Upgrading and repairing a storage system 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handling CRUs 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Avoiding electrostatic discharge (ESD) damage 4–2. . . . . . . . . . . .
Precautions when removing, installing, or storing CRUs 4–3. . . . .
Replacing or adding a disk module 4–4. . . . . . . . . . . . . . . . . . . . . . . . . .

vi Installing and Maintaining a DAS 150
Removing a disk module 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing a disk module 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing or installing a disk filler module 4–7. . . . . . . . . . . . . . . . . . . .
Replacing the SP 4–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the SP 4–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the SP 4–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing or installing SP memory modules 4–10. . . . . . . . . . . . . . . . . .
Removing SP memory modules 4–11. . . . . . . . . . . . . . . . . . . . . . . . . .
Installing SP memory modules 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing or adding the write-cache memory card 4–13. . . . . . . . . . . . .
Removing the write-cache memory card 4–13. . . . . . . . . . . . . . . . . .
Installing the write-cache memory card 4–14. . . . . . . . . . . . . . . . . . .
Installing or replacing the write-cache memory card battery 4–15. . . .
Installing the battery 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the battery 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing a VSC 4–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing a fan module 4–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical specifications A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spare parts for DAS 150 B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index X–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1
Chapter 1. About the storage system
1About the storage system
This chapter introduces the DAS 150 disk-array storage system. It describes the
hardware components that make up the storage system and the different ways to
connect the storage system to a computer, called a server.
The DAS 150 storage system provides a compact, high-capacity, high-availability
source of disk storage for the server at a low cost. It offers large-capacity, traditional
or high-availability disk storage in as many as seven disk modules that you can
replace under power.
DAS 150 disk-array storage system
Storage-system components
The storage system consists of a SCSI-2 (small computer system interface 2) adapter
in the server and a storage-system chassis that contains compartments for these
modules:
One storage-control processor (SP), which has a slot for the write-cache memory
card and its battery
Three to seven disk-drive modules
Three fan modules
Two voltage semi-regulated converters (VSCs), which are power supplies

1–2 Installing and Maintaining a DAS 150
Only service personnel authorized to open the server cabinet should install or replace
SCSI-2 adapters. The SP, write-cache memory card and its battery, disk modules, fan
modules, and VSCs are customer-replaceable units (CRUs), which you can install or
replace yourself.
The following figure shows the location of the storage system’s CRUs, which also
include the customer-replaceable SCSI bus cables, SCSI terminator plug, power cord,
and the optional asynchronous (console) cable.
Location of the customer-replaceable units in the disk-array storage system
A0
B0
A1
B1
B2
A3
A2
Back viewFront view
7 Disk-drive
modules
Storage-control
processor (SP)
VSC A
VSC B
SCSI bus
cables
ac power cord
Asynchronous
cable (optional)
3 Fan
modules
System
power light
System
service light
Write-cache
memory card
SCSI-2 adapter
The SCSI-2 adapter (or controller) is a printed-circuit board that resides in an I/O slot
in the server cabinet. It connects to the SP in the storage-system cabinet by a SCSI-2
differential bus, and transfers data between the server’s memory and the SCSI-2 bus.
The SCSI-2 adapter is supplied by the server’s vendor.
Storage-control processor (SP)
Replace light
(amber)
Bezel
Printed-circuit
board
Memory
modules
SP SCSI ID
switch
SCSI bus
connectors
Console
connector
Latch
Write-cache
memory card slot
Card eject
button cover

1–3
Chapter 1. About the storage system
The SP consists of a printed-circuit board with two memory modules (SIMMs) and a
bezel with the two SCSI bus connectors, SP SCSI ID switch, status light,
asynchronous console connector, a slot for the write-cache memory card, and latches
to secure the SP in place. The SP is visible from the rear of the storage system.
The memory modules provide either 8 or 32 Mbytes of SP memory. The
storage-system buffers use a minimum of 4 Mbytes of this memory.The rest of the
memory is available for read caching if the SP does not have a write-cache memory
card, and for both read and write caching if the SP does have this card.
The status light indicates the following:
Replace light (amber) — Lights when the SP is defective or during powerup.
The SP processes data written to or read from the disk-drive modules, and controls
the disk modules in the storage system through a synchronous SCSI-2 bus. It has two
internal SCSI-2 buses, bus A and bus B. Bus A supports as many as four disk-drive
modules, and bus B supports as many as three disk-drive modules, for a total of seven
disk-drive modules.
If you use the ArrayGUIdeutility to manage the storage system, this utility
communicates with the storage system using the SCSI bus. If you do not use this
utility, then the SP can use an RS-232 connection to a terminal or to the server.
Write-cache memory card
Write protect
switch
Battery
holder
The write-cache memory card is required for storage-system write caching. It is a
battery-backed-up PCMCIA card with memory that mirrors the storage-system
write cache on the SP. The replaceable battery maintains the card’s memory during
a power or SP failure to provide a safe copy of the write cache.
When power returns after a power failure, the storage system restores the SP’s write
cache from the data on the card. If the SP fails, you can use the card to transfer the
write cache to a replacement SP. When you insert the card into a replacement SP in
the same storage system, the storage system copies the data from the card into the
SP’s write cache. If you insert the card into an SP in a different storage system, the
storage system detects that the card contains data from another storage system’s
write cache and does not access the data.
The battery will maintain the card’s memory continuously without power for 13
months. When the SP detects that the card has been removed or that its battery is
low, it flushes the write cache data to disk and disables storage-system write
caching.

1–4 Installing and Maintaining a DAS 150
Disk-drive modules
Ready light
(green)
Fault light
(amber)
Busy light
(green)
Disk-drive
module’s label
Adisk-drive module, also called a disk module, consists of a disk drive, a power
regulator board, internal cabling, and a plastic carrier. The carrier has a handle and
guides for inserting and holding the module in the storage system’s chassis. A label
attached to the carrier’s top shows the drive module’s size and speed.
Three status lights on the module indicate the following:
Ready light (green) — Lights while the disk-drive module is powered up and ready
for use.
Busy light (green) — Lights while the drive is in use; for example, during formatting
or user I/O operations.
Fault light (amber) — Lights when this module is shut down by the SP because the
module failed. Also lights after you replace the drive, while the replacement drive
spins up to speed.
You can remove or install any one disk-drive module within an array group while the
storage system is running. You should never open a disk-drive module or attempt to
replace any of its internal components.
Power converters (VSCs)
System power
light (green)
System service
light (amber)
Fan fault
light (amber)
VSC fault
light (amber)
The VSCs are dc power modules that convert the installation site’s ac line voltage to
the dc voltages required to power the modules in the storage-system chassis. A
storage system contains two VSCs to provide high-availability operation.

1–5
Chapter 1. About the storage system
The VSCs are visible when you remove the storage system’s front panel. The system
power and system service lights are visible through a cutout in the front panel.
Four status lights on the VSC indicate the following:
System power light — Lights if the components in the storage system are powered
up.
System service light — Lights if SP or VSC has detected a hard or logical fault in
the chassis. When this light is on, you should check the fault lights on the other VSC,
all the disk modules, the SP, and the fan modules to determine which has failed. If
none of these fault lights is on, the write-cache memory card or its battery has a
problem. Chapter 4 describes how to replace each of these components.
VSC fault light (amber) — Lights if the VSC is faulty.
Fan fault light (amber) — Lights when the VSC determines that a fan module has
failed.
The system power and service lights on the top VSC (VSC A) are visible from the
front of the chassis.
If one VSC fails, the storage system continues to operate. If the second VSC fails, the
storage system shuts down.
You can remove or install a VSC while the storage system is running. You should
never open a VSC or attempt to replace any of its internal components.
Fan modules
Replace light
(amber)
The disk-array storage system uses three fan modules that snap into the back of the
storage system’s chassis.
One status light indicates the following:
Replace light (amber) — Lights when the fan module is not working.
For high-availability operation, the three fan modules operate independently. If one
fan module stops working, the remaining two fan modules speed up to maintain air
flow; and the replace light turns on to indicate that you must replace the fan module
as soon as possible.
You can remove a fan module while the storage system is running. If one of the fan
modules fails, replace it as quickly as possible to maintain high-availability operation.
Failure to replace the fan module could cause the disk-array storage system to shut
down if another fan module fails.

1–6 Installing and Maintaining a DAS 150
Connection to the server
The storage system connects to a server through a wide SCSI-2 differential bus. This
SCSI-2 bus connection allows the server to communicate with the disks in the storage
system, and also lets you administer, configure, or monitor the storage system using
the ArrayGUIdeutility. If you do not use this utility, the storage system can use an
asynchronous communications connection between its asynchronous (console) port
and one of the server’s RS-232 ports.
You can connect the storage system to one server in a basic configuration or to two
servers in a dual-initiator configuration.
Basic configuration
Storage systemServer
SCSI-2 bus
SCSI-2
adapter
SP
RS-232
RS-232 port
In the basic configuration, you connect the storage system through the SCSI-2 bus to
a SCSI-2 adapter in the server. Since the storage system has both SCSI in and out
ports, you can also connect one storage system to another storage system in a
daisy-chain on the SCSI-2 bus.
Dual-initiator configuration
Server 1
SCSI-2 bus
Storage system
SP
RS-232
SCSI-2
adapter
RS-232 port
SCSI-2
adapter
Server 2
In the dual-initiator configuration, you connect the storage system through one
SCSI-2 bus to a SCSI-2 adapter in each server. One server connects to the storage
system’s SCSI in port and the other server to its SCSI out port. Or, if you want to use
more than one storage system, you can connect one storage system to one or more
storage systems in a daisy-chain on the SCSI-2 bus, and then connect the second
server to the last storage system’s SCSI out port.

1–7
Chapter 1. About the storage system
Factory configuration
To make installation simpler, the storage systems are configured at the factory as
follows:
The SP SCSI ID is 0.
Drives are installed in consecutive slots from the top of the chassis downward.
For example, if the storage system has five drives, they are in the top five slots
(A0, B0, A1, B1, A2).
Drive modules are bound into logical units (LUNs) as follows:
Number of drives LUN configuration
3, 4, or 5 All drives bound as one RAID-5 group
6 First five drives bound as one RAID-5 group;
Sixth drive bound as a hot spare
7First five drives bound as one RAID-5 group;
Sixth and seventh drives bound as one
RAID-1 group
Caching enabled with the following parameters:
– Cache memory allocation:
4 Mbytes for system buffers
4 or 28 Mbytes for the read cache, depending on SP memory size
– Variable prefetching enabled for read caching
What next
If you are installing only one storage system on a SCSI bus — Continue to Chapter 2.
If you are installing multiple storage systems on a SCSI bus — Continue to Chapter 3.
End of Chapter

1–8 Installing and Maintaining a DAS 150

2–1
Chapter 2. Installing a single storage system on a SCSI bus
2Installing a single storage system
on a SCSI bus
Read this chapter if you are installing only one storage system on a SCSI bus in a
basic configuration. If you are installing two or more storage systems on the same
SCSI bus, skip to Chapter 3.
The procedures in this chapter assume the following:
The installation site meets the ac power requirements and operating limits listed
in Appendix A.
You have all the cables and cable adapters that you need. Appendix B lists the
cables available for each platform.
Someone has installed the SCSI-2 adapter in the server, and if necessary, updated
the server’s driver software for the adapter. Refer to the server’s documentation
for information on installing the adapter.
If the SCSI-2 adapter provides a single-ended SCSI bus, someone has connected
a single-ended to differential converter to the adapter to provide a differential
SCSI bus to the storage system.
Attaching the slot matrix diagram
Three sticky-backed labels are shipped with the storage system: a slot matrix showing
the disk drive module locations, and two sheets of stickers for identifying disk
modules. Attach the slot matrix label to your storage-system cabinet so it is visible.
The two sheets of stickers are for labeling the logical units (LUNs). If you are using
the storage system with the factory configuration, use these stickers now to identify
the preconfigured LUNs. (See the “Factory configuration” section in Chapter 1.) If
you are using a custom configuration, save the stickers for the person configuring the
disk modules into logical units (LUNs).

2–2 Installing and Maintaining a DAS 150
SP’s SCSI-2 bus connectors
Back view
SCSI
bus out
SCSI
bus in
The SCSI-2 bus in and out connectors are on the SP’s bezel, which is accessible from
the back of the storage system.
Connecting the SCSI-bus cable for the storage system
1. Shut down the operating system on the server.
2. Power down the server.
3. Locate the SCSI-bus cable, and plug one end into the connector for the SCSI-2
adapter on the server (or the connector on the converter) and plug the other end
into the SCSI bus in connector ( ) on the back of the storage system.
Refer to the server (or converter) and SCSI-2 adapter installation manuals for the
location of the SCSI-2 adapter connector and for the proper procedures for
connecting and securing the cable.
4. Follow the procedure below for the type of configuration you are installing.
Basic configuration — Make sure the SCSI terminator plug is fastened securely
to the SCSI bus out connector ( ) on the back of the storage system. The storage
system is shipped with the SCSI terminator plug installed on the SCSI bus out
connector.
Dual-initiator configuration — Plug one end of the second SCSI-bus cable into
the connector for the SCSI-2 adapter on the second server (or the connector on
the converter) and plug the other end into the SCSI bus out connector ( ) on the
back of the storage system.

2–3
Chapter 2. Installing a single storage system on a SCSI bus
Basic configuration
Cabling a single storage system to a SCSI bus
SCSI terminator plug
Connect to server’s
SCSI-2 adapter or
to single-ended-to-
differential converter
Dual-initiator configuration
Cabling a single storage system to a SCSI bus
Connect to first server’s
SCSI-2 adapter or
to single-ended-to-
differential converter
Connect to second
server’s SCSI-2 adapter
or to single-ended-to-
differential converter
Connecting a SCSI-bus cable
Connecting a SCSI terminator plug
Setting the SCSI ID for the SP
The SP requires a unique SCSI ID number, that is, a number that is not used by any
other device on the bus. The rotary switch on the SP’s bezel sets the SCSI ID for the
SP. The storage system ships with this switch set to SP SCSI ID 0. If the SP must
have another SCSI ID setting, set the switch to that ID.

2–4 Installing and Maintaining a DAS 150
SP SCSI ID switch
Note: Some operating systems
support only SCSI IDs 0
through 7.
SCSI ID Switch
number number
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 A
11 B
12 C
13 D
14 E
15 F
What you do next depends on what software you will use to administer the storage
system.
If you will use the ArrayGUIde utility — Skip to the “Connecting the power cord”
section.
If you will use dassmgr — Continue to the next section to connect the asynchronous
cable.