IBM TotalStorage NAS Gateway 500 User manual

IBM TotalStorage NAS Gateway 500
Service Guide
GY27-0418-00
򔻐򗗠򙳰

IBM TotalStorage NAS Gateway 500
Service Guide
GY27-0418-00
򔻐򗗠򙳰

First Edition (February 2004)
Before using this information and the product it supports, read the information in “Safety notices” on page xv,
Appendix E, “Environmental notices”, on page 427, and Appendix F, “Notices”, on page 429.
A reader’s comment form is provided at the back of this publication. If the form has been removed, address
comments to:
International Business Machines Corporation
Design & Information Development
Department CGF
P.O. Box 12195
Research Triangle Park, MC
U.S.A. 27709-9990
You can also submit comments by selecting Feedback at www.ibm.com/storage/support.
When you send information to IBM, you grant IBM a nonexclusive right to use or distribute the information in any
way it believes appropriate without incurring any obligation to you.
©International Business Machines Corporation, 2004. All rights reserved. Note to U.S. Government Users --
Documentation related to restricted rights -- Use, duplication or disclosure is subject to restrictions set forth is GSA
ADP Schedule Contract with IBM Corp.

Contents
About this manual .......................ix
Who should read this manual ....................ix
How to use this manual ......................ix
Publications ..........................ix
NAS Gateway 500 publications by task ...............ix
Hardcopy publications shipped with the NAS Gateway 500 ........xi
Softcopy publications ......................xi
Translated publications .....................xii
Related publications ......................xii
Additional information ......................xii
Notices and highlighting.....................xii
Accessibility .........................xiii
Web sites ..........................xiii
Safety notices .........................xv
Rack safety instructions......................xv
Electrical safety.........................xv
Laser safety information .....................xvi
Laser compliance .......................xvi
Data integrity and verification ...................xvii
Chapter 1. Reference information..................1
Overview ...........................1
System features .........................2
PCI-X slots and integrated adapter ports ...............3
Operator panel ........................4
Hardware security features ....................4
Front view of the NAS Gateway 500 (with bezel off)...........5
Back view of the NAS Gateway 500 ................5
Powering the system on and off ...................6
Console strategy.........................6
Power-on self-test ........................6
POST indicators .........................7
POST keys...........................7
System unit locations .......................8
Power supply locations .....................8
Fan locations .........................9
CEC backplane locations ....................10
PCI riser card locations .....................11
DIMM locations........................12
Reading the operator panel and system LEDs ............14
SCSI IDs and bay locations ...................15
System logic flow ........................16
Location codes .........................17
Physical location codes .....................17
Location code format......................17
AIX location codes ......................17
Mapping AIX and physical location codes ...............21
PCI riser card location codes...................23
Disk drive backplane location codes ................23
AIX and physical location code table ................24
System cables .........................27
Specifications .........................29
iii

External AC power cables .....................30
Service inspection guide .....................31
Chapter 2. Problem determination overview .............33
Maintenance Analysis Procedures (MAPs) ...............33
Checkpoints, error codes, and SRNs .................34
FRU isolation .........................35
FRU identify LEDs .......................35
Remote error notification (call home) .................35
Electronic Service Agent for the NAS Gateway 500 ...........36
Service processor ........................36
System LEDs .........................36
System attention LED ......................36
Accessing system error logs ....................36
Resetting the system attention LED .................37
Chapter 3. Maintenance Analysis Procedures (MAPs) .........39
Entry MAP ..........................39
Quick Entry MAP ........................40
MAP 0410: Repair Checkout ....................45
MAP 1020: Problem Determination .................49
MAP 1240: Memory Problem Resolution ...............52
MAP 1520: Power ........................58
FRU identify LEDs ......................59
MAP 1521: System with Power Failure and No Error Codes ........60
Map 1523: The SPCN Error Codes Table Directed You Here and the Error Code
is 1011 1B0x .........................66
MAP 1540: Problem Isolation Procedures ...............69
FRU identify LEDs ......................69
MAP 1541: JTAG Problem Isolation .................71
MAP 1542: I/O Problem Isolation ..................72
MAP 1548: Processor Subsystem Problem Isolation ...........77
MAP 1549: Attention Problem Isolation ................90
Chapter 4. Checkpoints .....................93
IPL flow ...........................93
Service processor checkpoints ...................94
Firmware checkpoints ......................101
Boot problems or concerns ...................122
Chapter 5. Error code to FRU index ................125
Performing slow boot ......................125
Four-character checkpoints ....................125
Replacing the operator panel ...................125
Replacing a PCI-X adapter ....................126
Determining location code ....................126
FRU identify LEDs .......................126
Checkpoint and error code index ..................127
Operator panel error codes ....................128
SPCN error codes .......................129
Firmware error codes ......................137
Service processor error codes ...................154
DIMM present detect bits (PD-bits) .................228
Error log utility procedure ....................228
System firmware update messages .................228
Scan dump messages......................229
iv NAS Gateway 500 Service Guide

Common firmware error codes...................229
Scan log dump progress codes ..................237
Problem determination generated error codes .............238
Chapter 6. Using the online and standalone diagnostics ........239
Operating considerations for online and standalone diagnostics ......239
Identifying the terminal type to the diagnostics ............239
Undefined terminal types ....................239
Service mode .........................239
Running the online diagnostics in service mode ...........240
Concurrent mode .......................240
Running the online diagnostics in concurrent mode ..........241
Maintenance mode .......................241
Running the online diagnostics in maintenance mode .........241
Standalone diagnostics operations .................242
Performing slow boot .....................242
Considerations for running standalone diagnostics from the diagnostic
CD-ROM .........................242
Chapter 7. Verifying the hardware operation ............243
Step 1. Considerations before running this procedure ..........243
Step 2. Load the diagnostics ...................243
Step 3. Run the verification procedure ................244
Step 4. Perform additional system verification .............244
Step 5. Stop the diagnostics ...................245
Chapter 8. Hardware problem determination ............247
Problem determination using the standalone or online diagnostics .....247
Problem determination when unable to load diagnostics .........252
Chapter 9. Using the service processor ..............255
Service processor menus ....................255
Accessing the service processor menus locally ...........255
Accessing the service processor menus remotely...........256
Saving and restoring service processor settings ...........256
Menu inactivity .......................256
General user menu .......................256
Privileged user menus......................257
Main menu .........................257
Service processor setup menu..................259
Passwords .........................259
System power control menu ..................265
System information menu ...................268
Language selection menu ...................275
Call-in/call-out setup menu ...................276
Modem configuration menu ...................277
Serial port selection menu ...................277
Serial port speed setup menu ..................278
Telephone number setup menu .................278
Call-out policy setup menu ...................279
Customer account setup menu .................280
Call-out test menu ......................280
Service processor parameters in service mode.............281
System power-on methods ....................281
Service processor reboot/restart recovery...............282
Boot (IPL) speed.......................282
Contents v

Failure during boot process ...................282
Failure during normal system operation ..............282
Service processor reboot/restart policy controls ...........282
System firmware updates ....................283
General information on system firmware updates ...........284
Determining the level of firmware on the system ...........285
Updating the firmware .....................285
Archiving the update files ...................287
Configuring and deconfiguring processors or memory ..........287
Run-time CPU deconfiguration (CPU repeat gard) ..........287
Service processor system monitoring - surveillance ...........287
System firmware surveillance ..................288
Operating system surveillance ..................288
Call-out (call-home) .......................288
Service processor error logs ...................289
LCD progress indicator log ....................290
Service processor operational phases ................291
Pre-standby phase ......................291
Standby phase .......................291
Bring-up phase .......................292
Runtime phase.......................292
Chapter 10. Using System Management Services ..........293
Select language ........................294
Change password options ....................295
View error log .........................295
Setup remote IPL (initial program load) ...............296
Change SCSI settings ......................299
Select console ........................299
Select boot options .......................300
Select boot devices.......................302
Display current settings .....................305
Restore default settings .....................305
Multiboot startup ........................305
Exiting System Management Services ................305
Chapter 11. Removal and replacement procedures ..........307
Safety considerations ......................307
Procedure list .........................309
Handling static-sensitive devices ..................310
Stopping the system ......................310
Starting the system .......................311
Placing the NAS Gateway 500 into the service position .........312
Returning the NAS Gateway 500 to the operating position ........313
Service cover .........................314
Service access cover removal ..................314
Service access cover replacement ................314
Bezel ............................315
Front bezel removal .....................315
Front bezel replacement ....................315
System rack removal and replacement................316
System drawer removal ....................316
System drawer replacement ..................317
Drawer-release latch and brackets .................320
Drawer-release latch removal ..................320
Drawer-release latch replacement ................321
vi NAS Gateway 500 Service Guide

Drawer-release latch bracket removal ...............321
Drawer-release latch bracket replacement .............322
Cable management arm .....................323
Cable management arm removal .................323
Cable management arm replacement ...............323
PCI-X adapters ........................324
PCI-X hot-plug manager access .................324
PCI-X adapter replacement ...................325
PCI-X adapter removal ....................328
PCI-X adapter installation ...................329
Verifying jumpers on PCI-X adapter options .............332
Fans ............................334
Fan assembly removal ....................334
Fan assembly replacement ...................335
Media drives (diskette and CD-ROM) ................337
CD-ROM or diskette drive ...................337
Media drive removal .....................337
Media drive replacement ....................338
Disk drives ..........................339
Non-mirrored disk drive replacement ...............339
Mirrored disk drive replacement .................339
Deconfiguring (removing) a disk drive ...............339
Disk drive removal ......................340
Disk drive replacement ....................341
Configuring (mirroring).....................342
Processor book ........................343
Processor book removal ....................343
Processor book replacement ..................344
Processor book insertion ....................344
DIMMs ...........................346
DIMM removal .......................346
DIMM insertion .......................347
Battery ...........................348
Power supplies ........................351
Power supply removal .....................351
Power supply replacement ...................352
PCI riser card .........................354
PCI riser card removal ....................354
PCI riser card replacement ...................357
Disk drive backplane ......................359
Disk drive backplane removal ..................359
Disk drive backplane replacement ................361
Operator panel ........................362
Operator panel removal ....................362
Operator panel replacement ..................363
System vital product data (VPD) update procedure ...........364
Central electronics complex (CEC) backplane .............366
CEC backplane removal ....................366
CEC backplane replacement ..................370
Chapter 12. Parts information ..................373
System parts .........................374
System parts, continued .....................376
System internal cables .....................378
Power cable .........................381
Contents vii

Chapter 13. Using the system ..................383
Reading the operator panel display .................383
Operator panel .......................383
System attention LED .....................384
Resetting the system attention LED ................384
Component LEDs ......................384
Appendix A. Getting help, service, and information ..........389
Service support ........................389
Hardware support ......................389
Software support.......................390
Before you call for service ....................390
Getting customer support and service ................390
Getting help online: www.ibm.com/storage/support ..........390
Getting help by telephone ...................391
Appendix B. Modem configurations ................393
Modem setup .........................393
Specific modem configuration files ................393
Configuration file selection ....................394
Configuring the 7852-400 Modem ................394
Configuring the 7857-017 or 7858-336 Modem............394
Generic configuration file selection .................396
Transfer of a modem session ...................399
Modem configuration sample files .................401
Appendix C. General attributes required when using a TTY terminal ...417
Additional communication attributes .................418
Additional keyboard attributes ...................418
Additional printer attributes ....................419
Appendix D. PD data collection worksheets.............421
PD data collection worksheet ...................421
PD data collection worksheet (continued)...............422
Appendix E. Environmental notices ................427
Product recycling and disposal ..................427
Environmental design ......................427
Acoustical noise emissions ....................427
Declared acoustical noise emissions ................427
Appendix F. Notices ......................429
Trademarks..........................429
Glossary ..........................431
List of abbreviations ......................431
Glossary of terms .......................432
Index ............................441
viii NAS Gateway 500 Service Guide

About this manual
This manual describes the service procedures for the IBM
®
TotalStorage
®
NAS Gateway 500, hereafter
referred to as the NAS Gateway 500.
Who should read this manual
This manual is written for trained service personnel. It can also be used by NAS Gateway 500 customers
with root access to replace customer replaceable units (CRUs) (for example, adapters).
Note: Only trained service personnel should replace field replaceable units (FRUs) (for example, the
operator panel).
How to use this manual
To use this manual, you should be familiar with:
vNAS Gateway 500 System Software (based on AIX
®
, IBM’s version of UNIX)
vNAS Gateway 500 hardware and software (Chapter 1, “Reference information”, on page 1)
vNAS Gateway 500 error codes, checkpoints, and service request numbers (SRNs) (Chapter 2, “Problem
determination overview”, on page 33)
vNAS Gateway 500 Maintenance Analysis Procedures (MAPs) (Chapter 3, “Maintenance Analysis
Procedures (MAPs)”, on page 39)
vNAS Gateway 500 service processor functions and menus (Chapter 9, “Using the service processor”, on
page 255)
There should also be a service console connected to serial port 1, to allow a connection to the NAS
Gateway 500 service processor menus and POST messages. It can also be used to access the NAS
Gateway 500 SMIT panels.
To start solving serviceable events on the NAS Gateway 500, service analysis should begin with
Chapter 3, “Maintenance Analysis Procedures (MAPs)”, on page 39.
Publications
The following sections contain information on the publications in the NAS Gateway 500 library. The first
section illustrates what manuals you can use to perform specific tasks, followed by lists of hardcopy and
softcopy publications, then how to find translated publications, and the last section provides a list of related
publications that might be helpful.
NAS Gateway 500 publications by task
Table 1 on page x shows the manuals in the NAS Gateway 500 library that contain information related to
this product and that support the listed common user tasks. That is, when you are performing a specific
task, you have a reference to the manual or manuals that contain the information that you need to perform
that task:
ix

Table 1. IBM TotalStorage NAS Gateway 500 information library as it supports common user tasks
Title User tasks
Planning Hardware
installation
Software
installation
Configuration Operation and
administration
Diagnosis,
problem
determination,
and service
IBM TotalStorage
NAS Gateway 500
Planning Guide,
GA27-4335
UU U
IBM TotalStorage
NAS Gateway 500
Hardware Installation
Guide, GA27-4336
UU
IBM TotalStorage
NAS Gateway 500
Quick Start
Instructions,
GX27-4026-00
U
IBM TotalStorage
NAS Gateway 500
Administrator’s
Guide, SC30-4072
UU U
IBM TotalStorage
NAS Gateway 500
Command
Reference,
SC30-4074
UUUU
IBM TotalStorage
NAS Gateway 500
CIFS File Serving
Guide, SC30-4075
UU U
IBM TotalStorage
NAS Gateway 500
Service Guide,
GY27-0418
UUU
IBM TotalStorage
NAS Gateway 500
Advanced
Configuration and
Problem
Determination
Guide, SC30-4073
UUUU
IBM TotalStorage
Translated Safety
Notices, GA27-4338
UU
xNAS Gateway 500 Service Guide

Hardcopy publications shipped with the NAS Gateway 500
The following technical publications are shipped in hardcopy with the NAS Gateway 500. These manuals
can also be found in PDF format on the NAS Gateway 500 documentation CD-ROM and at
www.ibm.com/servers/storage/support/:
vIBM TotalStorage NAS Gateway 500 Hardware Installation Guide, GA27-4336
This publication provides procedures for setting up, cabling, and replacing component options of the
NAS Gateway 500.
vIBM TotalStorage NAS Gateway 500 Quick Start Instructions, GX27-4026
This publication describes how to install the NAS Gateway 500.
vIBM TotalStorage NAS Gateway 500 Administrator’s Guide, SC30-4072
This publication describes how to configure the system for the NAS Gateway 500.
vIBM TotalStorage Translated Safety Notices, GA27-4338
This publication contains translations of safety notices specific to IBM TotalStorage NAS products.
vWeb site location for the IBM TotalStorage NAS Gateway 500 Release Notes
This publication identifies the Web site location (www.ibm.com/servers/storage/support/) for the NAS
Gateway 500 Release Notes
vIBM TotalStorage NAS Gateway 500 Statement of Limited Warranty, GX27-4024
This publication lists the warranty and translations of the warranty for the IBM TotalStorage NAS
Gateway 500.
Softcopy publications
Additional technical publications are provided in PDF format on the NAS Gateway 500 documentation
CD-ROM and at www.ibm.com/servers/storage/support/.
The following publications contain additional information about the NAS Gateway 500:
vIBM TotalStorage NAS Gateway 500 Planning Guide, GA27-4335.
This manual describes the requirements to consider when planning the installation of the IBM
TotalStorage NAS Gateway 500.
vIBM TotalStorage NAS Gateway 500 Advanced Configuration and Problem Determination Guide,
SC30-4073
This manual provides information on advanced configuration of the software and problem determination
for the NAS Gateway 500.
vIBM TotalStorage NAS Gateway 500 Service Guide, GY27-0418
This manual provides procedures intended for service personnel to troubleshoot and repair the NAS
Gateway 500.
vIBM TotalStorage NAS Gateway 500 Command Reference, SC30-4074
This manual contains reference information for commands that you can use on the IBM TotalStorage
NAS Gateway 500 System Software. It describes the tasks each command performs, how commands
can be modified, how they handle input and output, and who can run them.
vIBM TotalStorage NAS Gateway 500 CIFS File Serving Guide, SC30-4075
This manual provides information about concepts, tools, and techniques for networking NAS Gateway
500 to personal computer clients running Windows operating systems.
vIBM TotalStorage NAS Gateway 500 Release Notes, GX27-4027
These release notes provide product information about issues that were unresolved when the
information deliverables went to production.
vRS/6000
®
eServer
™
pSeries
®
Adapters, Devices and Cable Information for Multiple Bus Systems,
SA23-2778
This manual contains information about adapters, devices, and cables for your system.
About this manual xi

vRS/6000 eServer pSeries Diagnostic Information for Multiple Bus Systems, SA38-0509
This manual contains diagnostic information, service request numbers (SRNs), and failing function
codes (FFCs). It is intended to supplement the service information found in the IBM TotalStorage NAS
Gateway 500 Service Guide.
Translated publications
Translated publications can be found on the following Web site:
www.ibm.com/servers/storage/support/
Related publications
The following manuals provide additional information about or related to the system:
v7014 Model T00 and T42 Rack Installation and Service Guide
vAIX 5L Version 5.2 Commands Reference, Volume 1
vAIX 5L Version 5.2 Commands Reference, Volume 2
vAIX 5L Version 5.2 Commands Reference, Volume 3
vAIX 5L Version 5.2 Commands Reference, Volume 4
vAIX 5L Version 5.2 Commands Reference, Volume 5
vAIX 5L Version 5.2 Commands Reference, Volume 6
vAIX 5L Version 5.2 Files Reference
vAIX 5L Version 5.2 Glossary
vAIX 5L Version 5.2 Installation Guide and Reference
vAIX 5L Version 5.2 Network Information Services (NIS and NIS+) Guide
vAIX 5L Version 5.2 Operating System Installation: Getting Started
vAIX 5L Version 5.2 Performance Management Guide
vAIX 5L Version 5.2 Performance Tools Guide and Reference
vAIX 5L Version 5.2 Security Guide
vAIX 5L Version 5.2 System Management Concepts: Operating System and Devices
vAIX 5L Version 5.2 System Management Guide: Communications and Networks
vAIX 5L Version 5.2 System Management Guide: Operating System and Devices
vAIX 5L Version 5.2 System User’s Guide: Communications and Networks
vAIX 5L Version 5.2 System User’s Guide: Operating System and Devices
vAIX 5L Version 5.2 Technical Reference: Base Operating System and Extensions Volume 1
vAIX 5L Version 5.2 Technical Reference: Base Operating System and Extensions Volume 2
vAIX 5L Version 5.2 Web-based System Manager Administration Guide
Additional information
The following sections describe the notices and highlighting conventions used in the NAS Gateway 500
library, and also an explanation of the importance of capitalization when entering commands.
Notices and highlighting
The publications in the NAS Gateway 500 library contain certain notices that relate to a specific topic. The
caution and danger notices also appear in the multilingual Safety Information on the documentation
CD-ROM that came with the product. Each notice is numbered for easy reference to the corresponding
notices in the Safety Information.
The following list also includes highlighting conventions used throughout the library.
xii NAS Gateway 500 Service Guide

Term Definition in this document
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.
Bold Identifies commands, subroutines, keywords, files, structures, directories, and other items
whose names are predefined by the system. Also identifies graphical objects such as
buttons, labels, and icons that the user selects.
Italics Identifies parameters whose actual names or values are to be supplied by the user.
Monospace Identifies examples of specific data values, examples of text similar to what you might see
displayed, examples of portions of program code similar to what you might write as a
programmer, messages from the system, or information that you actually type.
Accessibility
The softcopy version of this manual and the other publications in the NAS Gateway 500 library are
accessibility-enabled for the IBM Home Page Reader.
Web sites
This section lists the Web sites where additional technical information is found. Be sure to visit the support
page that is specific to your hardware. The Web sites include FAQs, parts information, technical hints and
tips, technical publications, and downloadable files, if applicable.
Site Description
www.ibm.com Main IBM home page
www.storage.ibm.com/ IBM Storage home page
www.ibm.com/servers/storage/support/ IBM Support home page for Storage products
About this manual xiii

xiv NAS Gateway 500 Service Guide

Safety notices
Adanger notice indicates the presence of a hazard that has the potential of causing death or serious
personal injury. Danger notices appear on the following pages:
vxvi
v58
v59
v307
v351
Acaution notice indicates the presence of a hazard that has the potential of causing moderate or minor
personal injury. Caution notices appear on the following pages:
vxvi
v58
v307
v348
v317
v316
Note: For a translation of these notices, see Translated Safety Notices, GA27-4338. This document is
included on the NAS Gateway 500 documentation CD-ROM.
Rack safety instructions
vThis unit weighs a maximum of 39 kg (87.5 lb). Three persons are required to move it safely. Using
fewer than three persons to move it can result in injury.
vDo not install this unit in a rack where the internal rack ambient temperatures will exceed 35°C (95°F).
vDo not install this unit in a rack where the air flow is compromised. Any side, front, or back of the unit
used for air flow through the unit must not be in direct contact with the rack.
vEnsure that a hazardous condition is not created due to uneven mechanical loading when installing this
unit in a rack. If the rack has a stabilizer it must be firmly attached before installing or removing this
unit.
vConsider and inspect the connection of the equipment to the supply circuit to ensure that overloading of
circuits does not compromise the supply wiring or overcurrent protection. To provide the correct power
connection to the rack, refer to the rating labels located on the equipment in the rack to determine the
total power requirement for the supply circuit.
vAn electrical outlet that is not correctly wired could place hazardous voltage on the metal parts of the
system or the devices that attach to the system. It is the responsibility of the customer to ensure that
the outlet is correctly wired and grounded to prevent an electrical shock.
Electrical safety
Observe the following safety instructions any time you are connecting or disconnecting devices attached to
the workstation.
In the system that you are about to setup or service:
vThe ac power interface connector is considered the main power disconnect device.
vThis system has redundant power supply capabilities, meaning that it has two power supplies running
simultaneously in the same system unit. When instructed to disconnect the power source, ensure that
all power cables have been unplugged.
xv

DANGER
To prevent electrical shock hazard, disconnect all power cables from the electrical outlet before
relocating the system. (D07)
CAUTION:
This product is equipped with a 3-wire power cable and plug for the user’s safety. Use this power
cable in conjunction with a correctly grounded electrical outlet to avoid an electrical shock. (C10)
Laser safety information
CAUTION:
This product may contain a CD-ROM, DVD-ROM, or laser module on a PCI card, which are class 1
laser products. (C14)
Laser compliance
All lasers are certified in the U.S. to conform to the requirements of DHHS 21 CFR Subchapter J for class
1 laser products. Outside the U.S., they are certified to be in compliance with the IEC 825 (first edition
1984) as a class 1 laser product. Consult the label on each part for laser certification numbers and
approval information.
CAUTION:
All IBM laser modules are designed so that there is never any human access to laser radiation
above a class 1 level during normal operation, user maintenance, or prescribed service conditions.
Data processing environments can contain equipment transmitting on system links with laser
modules that operate at greater than class 1 power levels. For this reason, never look into the end
of an optical fiber cable or open receptacle. Only trained service personnel should perform the
inspection or repair of optical fiber cable assemblies and receptacles. (C13)
xvi NAS Gateway 500 Service Guide

Data integrity and verification
IBM computer systems contain mechanisms designed to reduce the possibility of undetected data corruption
or loss. This risk, however, cannot be eliminated. Users who experience unplanned outages, system failures,
power fluctuations or outages, or component failures must verify the accuracy of operations performed and
data saved or transmitted by the system at or near the time of the outage or failure. In addition, users must
establish procedures to ensure that there is independent data verification before relying on such data in
sensitive or critical operations. Users should periodically check the IBM support Web sites for updated
information and fixes applicable to the system and related software.
Safety notices xvii

xviii NAS Gateway 500 Service Guide