IBM DCS9550 User Manual

IBM System Storage

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DCS9550 1S1 Storage Expansi on Unit
Installation, Service, an d User Guide

SC30-9738-00

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with IBM Corp.

Preface

Preface

What is in this guide

This guide gives you step-by-step instructions on how to install, configure, and connect this product to
your host computer. In addition, it provide instructions on how to operate and service this product.

Who should use this guide

This guide assumes that you have a working knowledge of the Fibre Channel Arbitrated Loop (FC-AL)
and Advanced Technology Attachment (ATA) environments into which you are attaching the product. If
you do not have these skills, or are not confident with the instructions in this guide, do not proceed with
the installation.

NOTE :

Not all information contained in the following sections will pertain directly to your particular
product model.

Getting information, help, and service

If you need help, service, or technical assistance or just want more information about IBM products, you
will find a wide variety of sources available from IBM to assist you. This section contains information
about where to go for additional information about IBM and IBM products, what to do if you experience
a problem with your IBM System Storage DCS9550 product, and whom to call for service, if it is
necessary.

Support information

For online support information for your IBM System Storage DCS9550 product, visit the following Web
site:

www.ibm.com/support

For telephone support information, in the United States, contact IBM at 1-800-IBM-SERV (426-7378).

In other countries, visit the following Web site for support telephone numbers:

www .ibm.com/planetwide/

Before you call

Before you call, make sure that you have taken these steps to try to solve the problem yourself:

• Check all cables on your hardware to make sure that they are connected properly.

• Check the power switches to make sure that the system is turned on.

• Use the troubleshooting information in your system documentation and use the diagnostic tools that
come with your system.

Using the documentation

Information about the DCS9550 product is available on a documentation CD that comes with your
product. You can also access documents using the IBM Publications Center:

http://www.ibm.com/shop/publications/order

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

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Preface

International Standards

This product complies with the requirements of the following agencies and standards:

•CE

•UL

•cUL

Qualified Personnel

The personnel qualified to use this device are referred to within this document as follows:

• Service Person: Someone with the appropriate and necessary technical training and experience to be

aware of hazards to which they may be exposed in performing a task and of measures to minimize the
risks to that person or other persons.

• User/Operator: Any person authorized to handle/operate the product other than a Service Person.

Safe Handling

Do not try to lift the enclosure by yourself. An enclosure can weigh from 9kg (19.8 lb) to 37kg (77.6lb).
Before removing an enclosure from a rack cabinet, always first remove all modules and drives from the
enclosure to minimize weight if necessary.

Do not try to lift the enclosure by the handles on the PSU/Cooling module. The handles are not designed
to support the weight of the populated enclosure.

Figure P-1 W eight Handling Label: Lifting and Tipping

Figure P-2 Pinch Hazard Label: keep Hands Clear

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IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

Preface

Safety Guidelines

Caution ! If this product is used in a manner not specified by the manufacturer, the protection provided

by the product may be impaired.

The enclosure MUST be grounded before applying power.

!

Warning

Unplug the product if you think that it has become damaged

!

Warning

in any way and before you move it.

Caution ! Plug-in modules are part of the fire enclosure and must only be removed when a replacement

can be immediately added. The system must not be run without all units in place. Operate the
system with the enclosure top cover closed and blanking plates fitted where modules are
missing.

T o comply with applicable safety , emission, and thermal requirements, keep all enclosure covers securely
fitted and keep all bays fitted with plug-in modules.

Enclosures must be only operated from a power supply input voltage range of 100 V AC to 240 V
AC.When a redundant power input module is fitted, it must be operated from a reduced input voltage
range of 200 V AC to 240 V AC.

The plug on the power supply cord is used as the main disconnect device. Ensure that the socket outlets
are located near the product and are easily accessible.

The product is intended to operate with three working Plus. Before removal/replacement of any module
disconnect all supply power for complete isolation.

To ensure protection against electric shock caused by HIGH
LEAKAGE CURRENT (TOUCH CURRENT), the enclosure

!

Warning

must be connected to at least two separate and independent
sources. This should ensure a reliable earth connection

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

iii

Preface

Figure P-3 PSU/Cooling Module Caution Label:

Do not operate with modules missing. A faulty power supply/cooling module must be replaced with a fully
operational module within 24 hours.

To ensure your system has warning of a power failure,
disconnect the power from the PSU by either the switch

!

Warning

(where present) or by physically removing the power source,
prior to removing the PSU from the enclosure.

Do not remove a faulty power supply/cooling module unless you have a correct replacement product ready for
insertion.

Figure P-4 PSU W arning Label (Power Hazards)

Always disconnect power to the product prior to removal of the power supply/cooling module from the
product chassis.

Provide a safe electrical earth (ground) connection for the power cord.
Provide a suitable power source with electrical overload protection to meet the requirements detailed in the

product’s technical specifications.

Do not remove covers from the Power Supply Unit (PSU). The
is the Danger of electric shock. Return the damaged PSU to

!

Warning

your supplier for repair.

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IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

Figure P-5 PSU Safety Label (Electric Shock Hazard Inside)

Figure P-6 Redundant Power Input Switch Module Label (Hazardous Voltage)

Preface

Operation of the product with ANY modules MISSING in the
product’s chassis will disrupt airflow and the drives will not

!

Warning

Figure P-7 I/O Module Caution Label (Do not operate with modules missing)

receive sufficient cooling. It is ESSENTIAL that all bays in a
product chassis are filled before operating the product.

Figure P-8 Drive Carrier Module Caution Label (Drive Spin down time 30 seconds)

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

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Preface

Class 1 Laser Product

When the product is supplied with optical modules, it contain a laser that complies with Laser Class 1, US 21
QFR (J) & EN 60825-1, UL (NRTL) and TUV.

Caution ! If optical modules are to be provided and fitted by the end user, the modules must be a UL (or

other North American NRTL) RECOGNISED COMPONENT, must be approved by TUV (or
other European Product safety test house), and the laser in the module must comply with Laser
Class 1, US 21 QFR (J) & EN 60825-1.

Important ! Observe all applicable safety precautions (for example, weight restrictions, handling batteries

and lasers etc.) detailed in the preceding paragraphs when dismantling and disposing of this
product or its components.

Electronic Emission Notices

Federal Communications Commission (FCC) Class A Statement

IBM is not responsible for any radio or television interference caused by unauthorized changes or
modifications to this product. This product complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) this product must not cause harmful interference, and (2) this product must
accept any interference received, including interference that may cause undesired operation.

European Union (EU) Electromagnetic Compatibility Directive

This product conforms with the protection requirements of EU Council Directive 89/336/EEC on the
approximation of the laws of the Member States relating to electromagnetic compatibility. This product has
been tested and found to comply with the limits for Class A Information T echnology Equipment according to
European Standard EN 55022. The limits for Class A equipment were derived for commercial and industrial
environments to provide reasonable protection against interference with licensed communication equipment.

This is a Class A product. In a domestic environment this product may cause radio interference in which case
the user may be required to take adequate measures.

European Community contact:

IBM Technical Regulations
Pascalstr. 100, Stuttgart, Germany 70569
Tele: 0049 (0)711 7851176
Fax: [phone]
e-mail: [e-mail]

People’s Republic of China Class A Electronic Emission Statement

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IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

Taiwan Class A Electronic Emission Statement

Japan VCCI Class A ITE Electronic Emission St atement

Preface

Industry Canada Class A Emission Compliance Statement

This Class A digital product complies with Canadian ICES-003.

Avis de conformité à la réglementation d’Industrie Canada

Cet appareil numérique de la classe A est conform à la norme NMB-003 du Canada.

Germany Electromagnetic Compatibility Directive

Zulassungsbescheinigung laut dem Deutschen Gesetz über die elektromagnetische Verträglichkeit
von Geräten (EMVG) vom 18. September 1998 (bzw. der EMC EG Richtlinie 89/336).

Dieses Gerät ist berechtigt, in Übereinstimmung mit dem Deutschen EMVG das EG­Konformitätszeichen - CE - zu führen. Verantwortlich für die Konformitätserklärung nach Paragraph 5
des EMVG ist die: IBM Deutschland Informationssysteme GmbH 70548 Stuttgart. Informationen in
Hinsicht EMVG Paragraph 4 Abs. (1) 4:Das Gerät erfüllt die Schutzanforderungen nach EN 55024 und
EN 55022 Klasse A.

EN 55022 Klasse A Gerate mussen mit folgendem Warnhinweis versehen werden: Warnung: dies ist
eine Einrichtung der Klasse A. Diese Einrichtung kann im Wohnbereich Funkstorungen verursachen; in
diesem Fall kann vom Betreiber verlangt werden, angemessene Masnahmen durchzufuhren und dafur
aufzukommen. Anmerkung: Um die Einhaltung des EMVG sicherzustellen, sind die Gerate wie in den
IBM Handbuchern angegeben zu installieren und zu betreiben.

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

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Preface

Korean Class A Electronic Emission Statement

l

Rack System Precautions

The following safety requirements must be considered when the product is mounted in a rack.

Do not slide more than one product enclosure chassis out of the

!

rack at a time, to avoid the rack from toppling over.

Warning

ESD Precautions

Caution ! It is recommended that you wear a working (examine before wearing) anti-static wrist or ankle

strap and observe all conventional ESD precautions when handling Chassis slug-in modules and
components. Avoid contact with backplane components, module connectors, etc.

Data Security

• Before beginning product installation, power down your host computer and all attached peripheral
devices.

• Disk drives are fragile. Handle them with care, and keep them away from strong magnetic fields.

• All the supplied plug-in modules and blanking plates must be in place for the air to flow correctly around
the enclosure and to complete the internal circuitry.

• If the subsystem is used with modules or blanking plates missing for more than a few minutes, the
enclosure can overheat, causing power failure and data loss.

• If you remove any drive module, you may lo se data.

• If you remove a drive module, replace it immediately. Replace it with a drive module of the same type
and capacity

• Do not abandon your backup routines. No system is completely foolproof.

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IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

Preface

Taiwan Contact Information

How to Send Your Comments

Y our feedback is important in helping us to provide the most accurate and high-quality information. If you
have comments or suggestions for improving this publication, you can send us comments electronically
by using the following address:

Internet: [e-mail]
You can also mail your comments by using the Readers’ Comments Form in the back of this manual or

direct your mail to:
International Business Machines Corporation

Information Development Dept. GZW
9000 South Rita Road
Tucson, AZ 85744–0001
U.S.A.

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

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Preface

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IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

Preface

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IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

Contents

Content s

1 Introduction ..................................................................................................................................... 1

The IBM System Storage DCS9550 1S1 Storage Expansion Unit 1

1.1.1 Enclosure Chassis .............................................................................................................. 2

1.2.1 Power Supply/Cooling Module ........................................................................................... 3

1.2.2 Operators Panel ................................................................................................................. 4

1.2.3 SCM Input/Output Module .................................................................................................. 5

1.2.4 Drive Carrier Module .......................................................................................................... 8

1.2.5 Dummy Carrier Modules .................................................................................................... 9

1.2.6 Blank Modules .................................................................................................................... 9

1.4.1 Dimensions ....................................................................................................................... 10

1.4.2 Weight .............................................................................................................................. 10

1.4.3 AC Power (450W PSU) ............................... ... ... ............................................................... 10

1.4.4 PSU Safety and EMC Compliance ................................................................................... 10

1.4.5 Power Cord ...................................................................................................................... 10

1.4.6 Environment ..................................................................................................................... 11

1.4.7 Interfaces .......................................................................................................................... 12

1.4.8 SCM I/O Module Specification .................... ... ... .......................................... ... .................. 12

1.4.9 Drive Carrier Module Specification ................................................................................... 12

1.4.10 Software Enclosure Services (SES) Support ................................................................... 13

2 Installation ..................................................................................................................................... 15

2.1.1 Enclosure Bay Numbering Convention ............................................................................ 16

2.2.1 Pre-Requisites .................................................................................................................. 17

2.2.2 Rack Mounting Rail Kit .....................................................................................................17

2.2.3 Chassis Installation .......................................................................................................... 17

2.3.1 Parts Check List ............................................................................................................... 18

2.3.2 Power Supply/Cooling Module Procedure ........................................................................ 18

2.4.1 Internal Loop Structures ...................................................................................................20

2.7.1 Procedure ......................................................................................................................... 23

2.9.1 Planning and Configuring Your Installation ...................................................................... 26

2.10.1 Parts Check List ............................................................................................................... 27

2.10.2 Procedure ......................................................................................................................... 27

2.10.3 Dummy Carrier Modules .................................................................................................. 29

2.10.4 Engaging the Anti-tamper Locks ...................................................................................... 29

2.11.1 Parts Check List ............................................................................................................... 30

2.11.2 Procedure ......................................................................................................................... 30

3 Operation ....................................................................................................................................... 33

3.1.1 Power Supply/Cooling Module LEDs ............................................................................... 34

3.3.1 Disk Drives LEDs .................... ... ... ....................................... ... ... ...................................... 36

4 Troubleshooting and Problem Solving ....................................................................................... 37

4.2.1 Faulty Cords ..................................................................................................................... 37

4.2.2 Alarm Sounds On Power Up ...................................................... ... ................................... 38

4.2.3 Green “Signal Good” LED on SCM Not Lit ....................................................................... 38

4.2.4 Computer Doesn’t Recognize the DCS9550 1S1 Storage Expansion Unit ...................... 38

4.3.1 Power Supply/Cooling Module ......................................................................................... 38

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IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

4.3.2 Ops Panel ........................................................................................................................ 39

4.3.3 SCM I/O Module LEDs ..................................................................................................... 41

4.4.1 Audible Alarm Mute ..................... .............................................................................. ... .... 41

4.5.1 System Faults .......................................................................................... ... ..................... 42

4.5.2 Power Supply/Cooling Faults .................................................. ......................................... 42

4.5.3 Thermal Control ............................................................................................. ... ............... 43

4.5.4 Thermal Alarm ................................................................ ... ....................................... ....... 44

4.5.5 Thermal Shutdown ................................................................................ ... ... .....................44

4.6.1 Dummy Carrier Modules .................................................................................................. 45

4.9.1 Power Supply/Cooling Modules ........................................................................... .. .......... 46

4.9.2 Ops Panel ........................................................................................................................ 48

4.9.3 SCM I/O Module .............................................................................................................. 48

4.9.4 Drive Carrier Module ......................................... ....................................... ... ..................... 50

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Introduction

1.1 The IBM System Storage DCS9550 1S1 Storage Expansion Unit

.

Introduction

1

Figure 1–1 The DCS9550 SATA Disk Chassis Model 1S1 System

The DCS9550 1S1 Storage Expansion Unit design concept is based on a subsystem together with a set of plug-in
modules. The DCS9550 1S1 Storage Expansion Unit subsystem as supplied comprises:

• Chassis and Backplane with integral.Operators Panel.(See Figure 1–8)

• Up to 16 Serial ATA (SATA) Drive Carrier modules (See Figure 1–9)

– Serial ATA (SATA) drives with appropriate switching card.

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide 1

Introduction

• Dummy drive carrier modules.

• Two AC, 450W Power Supply/Cooling plug-in modules (see Figure 1–4)

• One or two Serial ATA Control (SCM) Input/Output modules, dependent on configuration required: 1.5Gb
internal operating speed with 1 Gb or 2Gb external operating speed. (See Figure 1–6).

1.1.1 Enclosure Chassis

The chassis consists of a sheet metal enclosure assembly containing a Backplane PCB and module runner system
This chassis assembly also includes an integral Operators (Ops) Panel, mounted at the rear.

The chassis assembly contains 16 drive bays at the front, each of which accommodates a plug-in drive carrier
module. The 16 drive bays are arranged in 4 rows of 4 drives. At the rear, the chassis assembly contains the integral
ops panel and four module bays to house two Power Supply/Cooling modules, one SCM I/O module, and one blank
SCM module filler.

The Backplane PCB provides logic level signal and low voltage power distribution paths. Figure 1–2 and Figure 1–

3 show front and rear views of an RS-1602 chassis respectively.

Note The DCS9550 1S1 Storage Expansion Unit is shipped in a preconfigured 42U rack configuration, except

for the top three in the rack with the controllers or top two in an expansion rack. Refer to the IBM System

Storage DCS9550 Installation, Service, and User Guide.

.

Figure 1–2 Enclosure Chassis (Front)

Figure 1–3 Enclosure Chassis (Rear)

.

2 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

1.2 The Plug-in Modules

An DCS9550 1S1 Storage Expansion Unit requires one or more of the following modules for normal operation:

1.2.1 Power Supply/Cooling Module

Two auto ranging AC 450WPower Supply/Cooling modules (Figure 1–4) are supplied mounted in the rear of the
enclosure as part of the subsystem core product.

Introduction

Figure 1–4 AC Power Supply/Cooling Module

.

PSU voltage operating ranges are nominally 115V or 230V AC, selected automatically.

.

Four LEDs mounted on the front panel of the Power Supply/Cooling module (see Figure 2–1) indicate the status
of the PSU and the fans.

1.2.1.1 Multiple Power Supply/Cooling Modules

The DCS9550 1S1 Storage Expansion Unit must always be operated with two Power Supply/Cooling modules
fitted. The two Power Supply/Cooling modules operate together so that if one fails the other maintains the power
supply and cooling while you replace the faulty unit.

Module replacement should only take a few minutes to perform but must be completed within 10 minutes from
removal of the failed module.

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide 3

Introduction

1.2.2 Operators Panel

Supplied as an integral part of the Enclosure core product, a typical Operators (Ops) Panel is shown in Figure 1–5.

Figure 1–5 Ops Panel

The Ops Panel provides the enclosure with a micro controller which is used to monitor and contro l all eleme nts of
the Enclosure.

1.2.2.1 Ops Panel Indicators and Switches

The Ops Panel includes Light Emitting Diodes (LEDs) which show the status for all modules, an Audible Alarm
which indicates when a fault state is present, a push-button Alarm Mute Switch and a thumb wheel Enclosure ID
Switch.

The Ops Panel switch functions are shown in Table 1–1.

Table 1–1 Ops Panel Switch Functions (Default settings for DCS9550 1S1 Storage Expansion

UnitSCM usage at 2Gb/s)

Switch Number

*See Sw 11

1 Not Used Off
2 Not Used Off
3 Not Used Off
4 Not Used Off

Function Recommended Setting Definition

5 Not Used Off

6 Not Used Off

4 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

Introduction

Table 1–1 Ops Panel Switch Functions (Default settings for DCS9550 1S1 Storage Expansion

UnitSCM usage at 2Gb/s)

Switch Number

Function Recommended Setting Definition

*See Sw 11

7 & 8

Drive Loop Speed
Select

Sw 7 Sw 8

DCS9550 Controller Settings Off Off Force 1Gb/s
DCS9550 Controller Settings On Off Force 2Gb/s (recommended)

9 & 10

Drive Addressing
Mode Selection

Sw 9 Sw 10

DCS9550 Controller Settings Off On Mode 1

On On Mode 0
On Off Mode 2
Off Off Mode 3 (not supported)*

11

SOFT SELECT On Selects functions using the

hardware switches

12 Not Used Off

Note: * Please contact your supplier for further information.

Important Switch settings are only read at Power On.

1.2.3 SCM Input/Output Module

The DCS9550 1S1 Storage Expansion Unit includes an enclosure with rear facing bays which houses one or two
SATA Control Interface Adaptor (SCM I/O) modules (see Figure 1–3), dependent on configuration required.

The plug-in SCM I/O modules have been designed for integration into a DCS9550 1S1 Storage Expansion Unit,
providing external FCAL cable interfacing with up to 16 SATA disk drives.

Processors housed on the SCM I/O modules provide enclosure management and interface to devices on the
Backplane, PSU, SCM and Ops Panel, to monitor internal functions.

The module incorporates the following LED indicators:

Host

Important If only one SCM module is fitted, the SCM module must be installed in Rear Bay 4 location [see

Figure 1–3, ”Enclosure Chassis (Rear)”, on page 2] and a Blank I/O module fitted in the unused

bay.
Table 1–2 SCM I/O Module LEDs

LED Definition Color Normal

Status

FC Host Port 0
Signal Good

Incoming FC signal is GOOD
No connection or incorrect connection
Invalid SFP connection

Green

On

Fault
Status

Off

Flashing

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide 5

Introduction

Table 1–2 SCM I/O Module LEDs

FC Host Port 1
Signal Good

Incoming FC signal is GOOD
No connection or incorrect connection
Invalid SFP connection

Router Status Storage Router Device Ready

Storage Router Device not ready or defective

ESI/SCM Module
Fault

Fault present (also On when booting)
Successful controller initialization

Green

Green

Amber

On

Off

Flashing

On Off

Off On

Figure 1–6 SCM I/O Module

6 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

Introduction

Figure 1–7 SCM Front Panel (as viewed from rear of Enclosure)

Figure 1–8 DCS9550 1S1 Storage Expansion Unit with SCM I/O Modules Installed

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide 7

Introduction

1.2.4 Drive Carrier Module

The Drive Carrier Module comprises a hard disk mounted in a carrier. Each drive bay can house a single Low Profile

1.0 inch high, 3.5 inch form factor disk drive in its carrier. The carrier has mounting locations for ATA or FC-AL
drives.

Each disk drive is enclosed in a die-cast aluminum carrier which provides excellent thermal conduction, radio
frequency, and electro-magnetic induction protection and affords the drive maximum physical protection.

The front cap also supports an ergonomic handle which provides the following functions:

• Camming of carrier into and out of drive bays.

• Positive 'spring loading' of the drive/backplane connector.

• An anti-tamper lock operated by a torx socket type key.

Figure 1–9 Drive Carrier Module

1.2.4.1 SATA Dual Path Transition Card

For SATA drives, a SATA dual path transition card is used in place of a SATA - PATA transition card. This is
attached to the rear of each drive to provide a SCA-2 interface to the drive carrier using the same pins as Fibre
Channel. In addition, the card provides a SATA path switch (1.5Gb/s) suitable for dual redundant I/O module
applications.

1.2.4.2 Drive Status Indicators

Each drive carrier incorporates two indicators, an upper (Green) and lower (Amber). In normal operation the green
indicator will be ON and will flicker as the drive operates.The amber indicator is OFF during normal operation and
ON if there is a drive fault present.

8 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide

1.2.4.3 Anti-tamper Locks

Anti-tamper locks are fitted in the drive carrier handles (Figure 1–10) and are accessed through the small cutout in
the latch section of the handle.These are provided to disable the normal ‘pinch' latch action of the carrier handle and
so prevent accidental or unauthorized removal of drives.

Figure 1–10 Anti-tamper Lock

Introduction

1.2.5 Dummy Carrier Modules

Dummy carrier modules are provided for fitting in all unused drive bays. They are designed as integral drive module
front caps with handles and must be fitted to all unused drive bays to maintain a balanced airflow.

1.2.6 Blank Modules

Blank SCM I/O modules must be fitted in the vacant SCM bay (slot 3) at the rear of the enclosure (Figure 1–3 on

page 2 refers) to maintain airflow and ensure correct operation.

ATTENTION Operation of the Enclosure with ANY modules missing will disrupt the airflow and the drives will

not receive sufficient cooling. It is ESSENTIAL that all apertures are filled before operating the
unit. Dummy Carriers and/or Blank modules are available fo r this purpose.

1.3 Visible and Audible Alarms

The functional modules have associated status LEDs. The Ops Panel shows a consolidated status for all modules.

LEDs show constant green for good or positive indication. Constant Amber LEDs indicate there is a fault present
within that module.

The Ops Panel also incorporates an Audible Alarm to indicate whe n a fault state is present and also an Ala rm Mute
push-button.

ATTENTION The Ops Panel is an integral part of the enclosure chassis assembly and is not field replaceable.

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide 9