IBM TotalStorage NAS 300 User manual

IBM TotalStorage
™
Network Attached Storage 300
Model 325
Service Guide


IBM TotalStorage
™
Network Attached Storage 300
Model 325
Service Guide


NOTE
Before using this information and the product it supports read the safety information in “Appendix I. Notices” on page 173.
First Edition (July 2001)
This guide applies to the IBM TotalStorage
™
Network Attached Storage 300.
Order publications through your IBM representative or the IBM branch office servicing your locality. Publications are
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© Copyright International Business Machines Corporation 2001. All rights reserved.
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with IBM Corp.

Contents
About this guide ........................vii
Frequently used terms ......................vii
Publications ..........................vii
Hardcopy publications shipped with the Network Attached Storage .....vii
Related publications ......................vii
Accessibility .........................viii
Web sites ...........................viii
Getting help online ......................viii
Other helpful sites.......................viii
Online support .........................viii
Chapter 1. General checkout ...................1
Checkout Steps .........................1
Checking out the engines ....................1
Checking out the Fibre Channel hub ................2
Checking out the RAID storage controller and the storage units ......2
Chapter 2. Introduction ......................3
IBM NAS 300 overview ......................3
IBM NAS 300 engines.......................3
Features...........................3
Components .........................4
Fibre Channel hub ........................4
GBICs ...........................5
Serial port connection ......................5
Ethernet connection ......................5
RAID storage controller ......................5
Features...........................6
Components .........................6
Storage Unit ..........................9
Features...........................9
Components .........................10
Supported software applications ..................14
Chapter 3. Troubleshooting....................15
Troubleshooting the engines ....................15
Diagnostic tools overview ....................15
Identifying problems using LEDs .................15
POST ...........................16
Diagnostic programs and error messages ..............17
Recovering BIOS .......................20
Troubleshooting the planar Ethernet controller ............20
10/100 Ethernet Adapter troubleshooting chart ............22
Gigabit Ethernet SX adapter troubleshooting chart ...........23
Running adapter diagnostics ...................25
Power checkout .......................27
Replacing the battery .....................28
Temperature checkout .....................29
Troubleshooting the Fibre Channel hub ................30
System reported error or failure to access a device ..........30
Visually inspect LEDs .....................30
Check for problems on attached devices ..............30
Checking the Fibre Channel hub .................30
© Copyright IBM Corp. 2001 iii

Service References ......................31
Troubleshooting the RAID storage controllers and storage units .......35
Checking the LEDs ......................36
Powering the IBM NAS 300 on and off ................42
Powering on when clustering is active ...............42
Powering off when clustering is active ...............43
Emergency Shutdown .....................43
Chapter 4. Symptom-to-FRU index .................45
Engine Symptom-to-FRU index ...................45
Power-on self-test .......................45
Beep symptoms .......................45
No Beep symptoms ......................47
Information panel system error LED ................48
Diagnostic error codes .....................49
Error symptoms .......................52
Fibre Channel hub Symptom-to-FRU index ..............63
RAID storage controller Symptom-to-FRU index.............63
Storage unit Symptom-to-FRU index .................64
Chapter 5. Installing and replacing IBM NAS 300 components ......67
Safety information ........................67
Before you begin ........................67
Handling static-sensitive devices .................67
Working inside a IBM NAS 300 component while power is on.......67
System reliability considerations .................67
Installing and replacing IBM NAS 300 engine components .........68
Major components ......................68
Installation and replacement procedures ..............70
Replacing the entire engine ....................85
Installing and replacing RAID storage controller components ........85
Handling static-sensitive devices .................85
Working with hot-swap drives ..................85
Working with hot-swap cooling fans ................88
Working with hot-swap power supplies ...............89
Working with hot-swap RAID controllers...............93
Replacing the battery in the RAID controller .............96
Installing GBICs and fiber optic cables ...............99
Installing and replacing storage unit components ............102
Handling static-sensitive devices .................102
Working with hot-swap drives ..................103
Working with hot-swap power supplies...............105
Working with hot-swap ESM boards................107
Working with GBICs .....................108
Working with hot-swap cooling fans ................108
Working with the Fibre Channel hub.................110
Chapter 6. Using system-level utilities ...............111
Using the Configuration/Setup Utility program .............111
Starting the Configuration/Setup Utility program ...........111
Choices available from the Configuration/Setup main menu .......111
Using passwords.......................115
Using the SCSISelect utility program ................117
Starting the SCSISelect utility program...............117
Choices available from the SCSISelect menu ............117
iv IBM NAS 300 Service Guide

Appendix A. FRU information (service only).............121
Removing the LED cover.....................121
Removing the on/off reset board ..................121
Removing the diskette/CDROM drive ................122
Removing the LED board ....................122
Removing the SCSI backplane assembly ...............123
Removing the hot-swap hard disk drive backplane ...........123
Removing the power supply backplane ...............124
Removing the AC Distribution Box .................124
Removing the system board ...................125
Appendix B. Parts listing ....................127
Fibre Channel hub 3535–1RU...................127
Engine 51875–RZ.......................127
RAID storage controller 5191–2RU.................128
Storage Unit 5192–1RU.....................129
Power Cords .........................129
Signal cables .........................129
Appendix C. PCI Adapter Placement................131
Appendix D. Power Cable Placement ...............133
Appendix E. Signal Cable Placement ...............135
Appendix F. Fibre Channel hub Diagnostics.............141
General information.......................141
Isolating a system fault ....................141
Removing power .......................141
Running diagnostics on the Fibre Channel hub.............141
Attaching to the serial port while the Fibre Channel hub is off ......141
Attaching to the serial port while the Fibre Channel hub is on ......142
Running diagnostics from a Telnet session on the Ethernet .......142
Power-on self tests ......................143
Diagnostic commands ......................143
ramTest ..........................144
portRegTest ........................144
centralMemoryTest ......................145
cmiTest ..........................145
camTest ..........................146
portLoopbackTest ......................146
sramRetentionTest ......................148
cmemRetentionTest......................148
crossPortTest ........................148
spinSilk ..........................151
diagClearError........................153
diagDisablePost .......................153
diagEnablePost .......................153
diagShow .........................153
setGbicMode ........................154
supportShow ........................154
Diagnostic error message formats .................155
Error message numbers ....................156
Error message tables .....................156
Appendix G. Shared storage setup ................161
Contents v

Starting Enterprise Management ..................162
Renaming storage subsystems .................163
Starting Subsystem Management..................163
Creating arrays and logical drives ................163
Creating Quorum arrays and LUNs under the Storage Manager 7
application ........................163
Format the logical drives ....................164
Configure the fibre-attached storage ...............165
Appendix H. Fast!UTIL options ..................167
Configuration settings ......................167
Host adapter settings .....................167
Selectable boot settings ....................168
Restore default settings ....................168
Raw NVRAM data ......................168
Advanced adapter settings ...................168
Extended Firmware Settings ..................170
Scan Fibre Channel Devices ...................171
Fibre Disk Utility ........................171
Loopback Data Test ......................172
Select Host Adapter ......................172
Appendix I. Notices ......................173
Safety and environmental notices .................173
Safety notices ........................174
Environmental notices .....................209
Index ............................213
vi IBM NAS 300 Service Guide

About this guide
This guide provides service procedures for the IBM TotalStorage
™
Network
Attached Storage 300.
Frequently used terms
The following list of terms, used within this document, have these specific
meanings:
Term Definition in this document
Drive bay A receptacle into which you insert a hard disk drive in an appliance.
The bays could be physically located in a separate rack from the
appliance.
Engine The processor that responds to requests for data from clients. This
is where the operating software for the NAS 300 appliance resides.
Storage unit Hardware that contains one or more drive bays, power supplies,
and a network interface. Some storage units contain a RAID
controller. There are no other components in a storage unit, and it
is accessed by a NAS appliance.
Notes These notices provide important tips, guidance, or advice.
Attention These notices indicate possible damage to programs, devices, or
data. An attention notice is placed just before the instruction or
situation in which damage could occur.
Caution These notices indicate situations that can be potentially hazardous
to you. A caution notice is placed just before descriptions of
potentially hazardous procedure steps or situations.
Danger These notices indicate situations that can be potentially lethal or
extremely hazardous to you. A danger notice is placed just before
descriptions of potentially lethal or extremely hazardous procedure
steps or situations.
Publications
Hardcopy publications shipped with the Network Attached Storage
The following publications are shipped in hardcopy and are also provided in
softcopy form at www.ibm.com/storage/support/nas:
vIBM TotalStorage Network Attached Storage 300 Hardware Installation Guide,
GA27-4275
This publication provides procedures for setting up, cabling, and replacing
components of the IBM TotalStorage Network Attached Storage .
vRelease Notes
This document provides any changes that were not available at the time this
publication was produced.
Related publications
The following publications contain additional information about the NAS 300:
vIBM TotalStorage Network Attached Storage User’s Reference, GA27-4276
vIBM TotalStorage Network Attached Storage Installation Guide, GA27-4275
© Copyright IBM Corp. 2001 vii

vSafety Information, 44L2247
Accessibility
The softcopy version of this guide and the other related publications are all
accessibility-enabled for the IBM Home Page Reader.
Web sites
Getting help online
www.ibm.com/storage/support/nas
Here you can visit a support page that is specific to your hardware, complete with
FAQs, parts information, technical hints and tips, technical publications, and
downloadable files, if applicable.
Other helpful sites
www.ibm.com Main IBM home page
www.ibm.com/storage IBM Storage home page
www.ibm.com/storage/support/nas IBM NAS Support home page
www.ibm.com/storage/nas IBM NAS products
www.tivoli.com Tivoli
www.cdpi.com Columbia Data Products
Online support
Use the following Web site to obtain online support:
www.storage.ibm.com/support/nas
viii IBM NAS 300 Service Guide

Chapter 1. General checkout
This chapter describes general checkout for the IBM TotalStorage
™
Network
Attached Storage 300, hereafter referred to as the IBM NAS 300.
For the IBM NAS 300 engines, diagnostic programs are stored in upgradable
read-only memory (ROM). These programs are the primary method of testing the
major internal components of the IBM NAS 300 engines (the system boards, planar
Ethernet controllers, RAM, CD-ROMs, diskette drives, serial ports, hard drives, and
parallel ports). See “Diagnostic programs and error messages”on page 17.
Also, if you cannot determine whether a problem is caused by the hardware or by
the software, you can run the diagnostic programs to confirm that the hardware is
working correctly.
For the RAID storage controllers and storage units, use the status LEDs,
Symptom-to-FRU list, and the storage management software to diagnose problems.
Note: To display certain error messages and run certain diagnostics programs
described in this guide, you need to attach (before power-up) a monitor,
keyboard, and mouse to the engine.
When you run the diagnostic programs, a single problem might cause several error
messages. When this occurs, work to correct the cause of the first error message.
After the cause of the first error message is corrected, the other error messages
might not occur the next time you run the test.
Notes:
1. If multiple error codes are displayed, diagnose the first error code displayed
(see “Diagnostic error codes”on page 49).
2. If the appliance engine hangs with a POST error, go to “POST error codes”on
page 53.
3. If the appliance engine hangs and no error is displayed, go to “Undetermined
problems”on page 62.
4. Power supply problems, see “Power supply LED errors”on page 52.
5. Safety information, see “Appendix I. Notices”on page 173.
6. For intermittent problems, check the error log; see “Event/error logs”on
page 17.
Checkout Steps
Checking out the engines
Perform the following steps:
1. Power-off the engine.
2. Check all cables and power cords.
3. Power-on the engine.
4. Record any POST error messages displayed on the screen. If an error is
displayed, look up the first error in the “POST error codes”on page 53.
5. Check the information LED panel System Error LED; if on, see “Information
panel system error LED”on page 48.
© Copyright IBM Corp. 2001 1

6. Check the System Error Log. If an error was recorded by the system, see
“Chapter 4. Symptom-to-FRU index”on page 45.
7. Start the Diagnostic Programs. See “Starting the diagnostic programs”on
page 18 .
8. Check for the following responses:
a. Beeps
b. Readable instructions or the Main Menu
9. If the diagnostics completed successfully and you still suspect a problem, see
“Undetermined problems”on page 62.
Checking out the Fibre Channel hub
Perform the following steps:
1. Verify that all external covers are present and not damaged.
2. Ensure that all latches and hinges are in correct operating condition.
3. Check the power cord for damage.
4. Check the external signal cable for damage.
5. Check the cover for sharp edges, damage, or alterations that expose the
internal parts of the device.
6. Correct any problems that you find.
Checking out the RAID storage controller and the storage units
Use the status LEDs, Symptom-to-FRU list, and the storage management software
to diagnose problems. For information about diagnosing possible problems, see
“Troubleshooting the RAID storage controllers and storage units”on page 35.
Note: If power was just applied to the RAID storage controller, the green and
amber LEDs might turn on and off intermittently. Wait until the RAID storage
controller finishes powering up before you begin checking for faults.
2IBM NAS 300 Service Guide

Chapter 2. Introduction
The IBM NAS 300 is a storage appliance that allows you to easily attach storage to
a network. Because it is an appliance, you do not need to know about the internal
operating system.
IBM NAS 300 overview
The IBM NAS 300 is a rack-mounted storage server consisting of the following
components:
Engines
Two IBM 5187 Network Attached Storage Model 5RZ engines. These act as
a″gateway″between your Ethernet network and the network-attached
storage.
Fibre Channel Hubs
Two IBM 3534 Fibre Channel Hub Model 1RUs. These devices connect the
engines to the storage controller.
RAID Storage Controller
An IBM 5191 RAID Storage Controller Model 2RU. This device delivers fast,
high-volume data transfer, retrieval, and storage functions across multiple
drives, to multiple hosts. Optionally, a second storage controller can be
added to the IBM NAS 300 to increase the number of hard drives available.
Storage Units
Multiple IBM 5192 Network Attached Storage Storage Unit Model 1RU.
These optional 10–drive expansion units add additional Fibre Channel (FC)
disk storage.
IBM NAS 300 engines
The IBM NAS 300 comes standard with two IBM TotalStorage Network Attached
Storage Models 5RZ engines.
Features
Each engine includes the following standard features:
vDual 933 MHz processors
v1–GB memory
v1–port Fibre Channel adapter
v1–built-in 10Base-T/100Base-TX Ethernet controller
v9.1–GB hard disk drive
vDual 270–W redundant power supplies
You can add the following features to each of the IBM NAS 300 engines:
vIBM 10/100 Ethernet Server adapters
vIBM Gigabit Ethernet SX Server adapters
vNetfinity Advanced System Management PCI Adapter
vIBM PCI Fast/Wide Ultra SCSI Adapter
For additional information about installing these adapters in the PCI slots, see
“Appendix C. PCI Adapter Placement”on page 131.
© Copyright IBM Corp. 2001 3

Components
The following sections show the components of the engine.
Note: The hot-swap features of the engine enable you to remove and replace hard
disk drives, power supplies, and fans without powering off the engine.
Therefore, you can maintain the availability of your system while a hot-swap
device is removed or replaced.
The following is a list of compnents found in each engine:
Microprocessors
Each engine comes with two 933 MHz Pentium III processors.
Memory modules
Each engine contains two 512 MB memory modules.
Non hot-swap drives
Each engine contains a 3.5–inch diskette drive and a compact disk drive.
Hot-swap hard disk drive
Each engine comes with one hot-swap hard disk drive. This drive is used
by the engine’s operating system.
Hot-swap fans
Each engine has three interchangeable hot-swap and redundant fans. If
one fan fails, the other fans continues to operate. All fans must be installed
to maintain proper cooling within your engine, even if one fan is not
operational.
Hot-swap power supplies
Each engine comes with two hot-swap power supplies. Both power supplies
must be installed to maintain proper cooling.
PCI adapters
Each engine has four available PCI slots. You can add optional Ethernet,
ASM, and SCSI adapters. For more information about optional adapters,
refer to the IBM NAS 300 Installation Guide.
Fibre Channel hub
The IBM NAS 300 Fibre Channel hub is an eight-port Fibre Channel hub that
includes seven fixed short-wave optic ports, one gigabit interface converter (GBIC)
port, and an operating system for building and managing a switched-loop
architecture.
The hub is a high-performance fiber optic hub with the following characteristics:
vEasy-to-use —After the power-on self-test (POST) completes, you need only to
add the IP address of the hub. The remainder of the hub’s configuration is
automated.
vFlexible —GBIC modules and fixed optic ports support fibre transmission media.
vReliable —Hub uses highly integrated, multifunction application specific
integrated circuit (ASIC) components.
vHigh Performance —Hub has a data transfer latency of less than 2
microseconds transferring data from any port ot any port at peak Fibre Channel
bandwidth of 100 MB per second when there is no port contention.
4IBM NAS 300 Service Guide

GBICs
Each IBM NAS 300 Fibre Channel hub accommodates one short-wavelength (SWL)
GBIC module. The SWL fiber optic GBIC module, with SC connector color-coded
black, is based on short-wavelength lasers supporting 1.0625 GB per second link
speeds. This GBIC module supports 50-micron multimode fiber optic cables (up to
500 meters in length) and 62.5-micron multimode fiber optic cables (up to 175
meters in length). The GBIC module is shipped with a protective plug in place and
should remain in place if no fiber optic cable is connected to the port.
Serial port connection
The Fibre Channel hub includes a serial port, which is used to set the IP address
when setting up, reinitializing the Fibre Channel hub, or running diagnostics. The
serial port connection is not used during normal operation.
The settings of the serial port are as follows:
v8-bit
vNo parity
vOne stop bit
v9600 baud
vFlow Control = None
vEmulation = Auto Detect
Note: The serial port and Telnet connection are mutually exclusive. There can be
only one serial port session active at a time. Telnet takes priority, so the
serial port is terminated when a Telnet connection is made. The serial
connection is restored after the Telnet session is completed. Logging in
again is required. A password is required to login to the serial port session
as password checking is skipped only at initial power on.
Ethernet connection
The Ethernet port allows you to connecting the Fibre Channel hub to an existing
10/100BaseT Ethernet local area network (LAN). This Ethernet port provides the
following functions:
vProvides access to the Fibre Channel hub’s internal SNMP agent
vPermits remote Telnet and Web access for remote monitoring and testing
vPermits the setting or changing of the IP address
Note: The Ethernet port is only for Telnet, SNMP agent, and the Web-based server
access. No fabric connection is used with this connection.
RAID storage controller
The IBM NAS 300 RAID storage controller comes with two RAID controllers, two
power supplies, and two cooling units, and provides dual, redundant controllers,
redundant cooling, redundant power, and battery backup of the RAID controller
cache.
The IBM NAS 300 RAID storage controller supports Fibre Channel.Itisanew
technology, similar to a high-speed network, that you can use to connect large
amounts of disk storage to a controller or cluster of controllers. Fibre Channel
technology provides increased performance, scalability, availability, and distance for
Chapter 2. Introduction 5

attaching storage subsystems to network servers. The RAID storage controller
provides for the attachment of Fibre Channel disk drives to give superior
performance and redundancy.
Features
Each RAID storage controller includes the following standard features:
vDual RAID Controllers
v10 Fibre Channel 40—pin disk drives
vDual power supplies and dual modular cooling fan assemblies
vSupport for RAID levels 0, 1, 3, 5,and 10
Table 1. RAID storage controller features
General
vModular components:
–High-capacity disk drives
–RAID controllers
–Power supplies
–Cooling fans
vTechnology:
–Support for disk arrays
–Support for clustering
–Fibre Channel host interface
–Redundant data storage, cooling
system, power system, and RAID
controllers
–Hot-swap technology for drives,
power supplies, fans, and RAID
controllers
vUser interface:
–Built-in power, activity, and fault light
emitting diodes (LEDs)
–Identification labeling on customer
replaceable units (CRUs), rear LEDs,
switches, and connectors
–Easy-to-replace drives, power
supplies, RAID controllers, and fans
Disk drive storage
Maximum drives per storage server: 10
RAID controllers
vTechnology and interfaces:
–Fibre Channel: 40-pin FC disk drives
–Fibre Channel interface: Four Gigabit
Interface Converter (GBIC)
connectors for incoming and
outgoing FC cables (two GBICs on
each RAID controller)
Components
The following sections show the components of the RAID storage controller.
Note: The hot-swap features of the RAID storage controller enable you to remove
and replace hard disk drives, power supplies, RAID controllers, and fans
without powering off the RAID storage controller. Therefore, you can maintain
the availability of your system while a hot-swap device is removed or
replaced.
Front view
The following illustration shows the components and controls on the front of the
RAID storage controller.
Drive activity LED
Hot-swap
drive CRU
Tray handle Latch
Drive fault LED
Power-on LED
General-system-
error LED
6IBM NAS 300 Service Guide

Power-on LED
When on, this green light indicates that the unit has good dc power.
General-system-error LED
When on, this amber LED indicates that the RAID storage controller has a
fault, such as in a power supply, fan unit, or hard disk drive.
Note: If the General-system-error LED is on continuously (not flashing),
there is a problem with the RAID storage controller. Use the
storage-management software to diagnose and repair the problem.
Hot-swap drive CRU
Your RAID storage controller comes standard with 10 hot-swap drive
customer replaceable units (CRUs) in the storage server. Each drive CRU
consists of a hard disk drive and tray.
Drive activity LED
Each drive CRU has a green Drive activity LED. When flashing, this green
LED indicates drive activity. When on continuously, this green LED indicates
that the drive is properly installed.
Drive fault LED
Each drive CRU has an amber Drive fault LED. When on, this amber LED
indicates a drive failure. When flashing, this amber LED indicates that a
drive identify or rebuild process is in progress.
Latch This multipurpose blue latch releases or locks the drive CRU in place.
Tray handle
You can use this multipurpose handle to insert and remove a drive CRU in
the bay.
For information on installing and replacing drive CRUs, see “Chapter 5. Installing
and replacing IBM NAS 300 components”on page 67. For more information about
the LEDs, see the IBM NAS 300 User’s Reference.
Back view
The following illustration shows the components at the back of the IBM NAS 300
RAID storage controller.
Hot-swap fan bays
Hot-swap
power supplies
Raid controllers
RAID controller
The RAID storage controller comes with one or two hot-swap RAID
controllers. Each RAID controller contains two ports for Gigabit Interface
Chapter 2. Introduction 7

Converters (GBICs), which connect to the Fibre Channel cables. One GBIC
connects to a host system. The other GBIC is used to connect additional
storage units to the RAID controller.
Each RAID controller also contains a battery to maintain cache data in the
event of a power failure.
Hot-swap fans
The RAID controller has two interchangeable hot-swap and redundant fan
CRUs. Each fan CRU contains two fans. If one fan CRU fails, the second
fan CRU continues to operate. Both fan CRUs must be installed to maintain
proper cooling within your RAID controller, even if one fan CRU is not
operational.
Hot-swap power supplies
The RAID controller comes with two hot-swap power supplies. Both power
supplies must be installed to maintain proper cooling.
Interface ports and switches
The following illustration shows the ports and switches on the back of the RAID
controller.
RAID controllers
Host port Host port
Ethernet port Ethernet port
RS-232 port RS-232 port
Expansion port
Expansion port
AC power
connector
AC power
switch
AC power
switch
AC power
connector
RAID controller
Each RAID controller contains several connectors and LEDs. Each
controller has one host port and one expansion port for connecting the
storage server to hosts or expansion units. You first insert GBICs into the
ports and then connect the Fibre Channel cables.
Host port
The host port is used to connect a Fibre Channel cable from the IBM NAS
300 Fibre Channel hub. You first insert a GBIC into the port and then
connect a Fibre Channel cable.
Ethernet port
The Ethernet port is for an RJ-45 10 BASE-T or 100 BASE-T Ethernet
connection. Use the Ethernet connection to directly manage storage
subsystems.
Expansion port
The expansion port is used to connect additional expansion units to the
RAID controllers. You first insert a GBIC into the port and then connect a
Fibre Channel cable.
8IBM NAS 300 Service Guide

RS-232 port
The RS-232 port is a TJ-6 modular jack and is used for an RS-232 serial
connection. The RS-232 port is used by service personnel to perform
diagnostic operations on the RAID controllers. An RS-232 cable comes with
the RAID storage controller.
Storage Unit
The IBM NAS 300 storage unit is a compact unit that provides high-capacity, Fibre
Channel (FC) disk storage. It delivers fast, high-volume data transfer, retrieval, and
storage functions across multiple drives, to multiple hosts. The expansion enclosure
is designed for continuous, reliable service; the modular, redundant disk drives,
power supplies, ESM boards, and fans use hot-swap technology for easy
replacement without shutting down the system.
The storage unit supports redundant, dual-loop configurations. Optional external FC
cables and gigabit interface converters (GBICs) connect the RAID controller to the
storage unit.
By adding an additional RAID storage controller, you can add up to seven 10–drive
storage units to your IBM NAS 300.
Features
Each storage unit includes the following standard features:
vDual ESM boards: The environmental services monitor (ESM) boards contain the
expansion unit controls, switches, and LEDs. Each ESM board has two GBIC
ports for connecting the storage unit to the RAID storage controller.
v10 Fibre Channel 40–pin disk drives.
vDual power supplies and dual modular cooling fan assemblies.
Table 2. storage unit features
General
vModular components:
–High-capacity disk drives
–Environmental services monitor
(ESM) boards
–Power supplies
–Cooling fans
vTechnology:
–Supports disk arrays
–Supports clustering
–Fibre Channel host interface
–Redundant data storage,
cooling system, power system,
and ESM boards
–Hot-swap technology for drives,
power supplies, fans, and ESM
boards
vUser interface:
–Built-in power, activity, and fault
indicators
–Identification labeling CRUs,
rear indicator lights, switches,
and connectors
–Easy-to-replace drives, power
supplies, ESM boards, and fans
Disk drive storage
Maximum drives per storage unit:
10
ESM boards
vTechnology and interfaces:
–Fibre Channel: 40-pin FC disk
drives
–Fibre Channel interface: Four,
GBICs connectors for incoming
and outgoing FC cables (two
GBICs on each ESM board)
Chapter 2. Introduction 9

Components
The following sections describe the components of the storage unit.
Note: The hot-swap features of the IBM NAS 300 storage unit enable you to
remove and replace hard disk drives, power supplies, ESM boards, and fans
without turning off the storage unit. Therefore, you can maintain the
availability of your system while a hot-swap device is removed or replaced.
Storage unit CRUs
This section lists the storage unit CRUs.
Hot-swap drives: The following illustration shows the location of the hot-swap
drive bays accessible from the front of your expansion unit. The storage unit
contains 10 slim 40-pin FC hard disk drives. These drives come preinstalled in drive
trays. This drive-and-tray assembly is called a drive CRU (customer replaceable
unit).
Hot-swap drive bays
Attention: Never hot-swap a drive CRU when its green Activity LED is flashing.
Hot-swap a drive CRU only when its amber Fault LED is completely on and not
flashing or when the drive is inactive with the green Activity LED completely on and
not flashing.
Fan, ESM, and power supply CRUs: The following illustration shows the location
of the hot-swap fan CRUs, the hot-swap ESM CRUs, and the hot-swap power
supply CRUs.
ESM CRUs
Your storage unit comes with two hot-swappable ESM boards. The ESM
boards provide a 1–Gb FC interface to the drives and monitors the overall
ESM bays
Hot-swap fan bays
Hot-swap power
supply bays
10 IBM NAS 300 Service Guide