IBM XSERIES 255 TYPE 8685 User manual

xSeries 255 Type 8685
Hardware Maintenance Manual and Troubleshooting
Guide
ERserver
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xSeries 255 Type 8685
Hardware Maintenance Manual and Troubleshooting
Guide
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Note
Before using this information and the product it supports, be sure to read Appendix C, “Notices,” on
page 209.
14th Edition (June 2005)
The following paragraph does not apply to the United Kingdom or any country where such provisions are
inconsistent with local law:
INTERNATIONAL BUSINESS MACHINES CORPORATION PROVIDES THIS PUBLICATION ″AS IS″WITHOUT
WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR APARTICULAR PURPOSE. Some states do not allow
disclaimer of express or implied warranties in certain transactions, therefore, this statement may not apply to you.
This publication could include technical inaccuracies or typographical errors. Changes are periodically made to the
information herein; these changes will be incorporated in new editions of the publication. IBM may make
improvements and/or changes in the product(s) and/or the program(s) described in this publication at any time.
This publication was developed for products and services offered in the United States of America. IBM may not offer
the products, services, or features discussed in this document in other countries, and the information is subject to
change without notice. Consult your local IBM representative for information on the products, services, and features
available in your area.
Requests for technical information about IBM products should be made to your IBM reseller or IBM marketing
representative.
©Copyright International Business Machines Corporation 2002. All rights reserved.
US Government Users Restricted Rights –Use, duplication or disclosure restricted by GSA ADP Schedule Contract
with IBM Corp.

About this manual
This manual contains diagnostic information, aSymptom-to-FRU index, service
information, error codes, error messages, and configuration information for the IBM
®
Eserver xSeries
® 255.
Important: The field replaceable unit (FRU) procedures are intended for trained
servicers who are familiar with IBM xSeries products. See the parts
listing in “System” on page 160 to determine if the component being
replaced is acustomer replaceable unit (CRU) or aFRU.
Important safety information
Be sure to read all caution and danger statements in this book before performing
any of the instructions. See “Safety information” on page 167.
Leia todas as instruções de cuidado eperigo antes de executar qualquer operação.
Prenez connaissance de toutes les consignes de type Attention et Danger avant de
procéder aux opérations décrites par les instructions.
Lesen Sie alle Sicherheitshinweise, bevor Sie eine Anweisung ausführen.
Accertarsi di leggere tutti gli avvisi di attenzione edi pericolo prima di effettuare
qualsiasi operazione.
Lea atentamente todas las declaraciones de precaución ypeligro ante de llevar a
cabo cualquier operación.
WARNING: Handling the cord on this product or cords associated with accessories
sold with this product, will expose you to lead, achemical known to the State of
California to cause cancer, and birth defects or other reproductive harm. Wash
hands after handling.
ADVERTENCIA: El contacto con el cable de este producto ocon cables de
accesorios que se venden junto con este producto, pueden exponerle al plomo, un
elemento químico que en el estado de California de los Estados Unidos está
considerado como un causante de cancer yde defectos congénitos, además de
otros riesgos reproductivos. Lávese las manos después de usar el producto.
Online support
You can download the most current diagnostic, BIOS flash, and device driver files
from http://www.ibm.com/pc/support on the World Wide Web.
©Copyright IBM Corp. 2002 iii

iv xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide

Contents
About this manual ....................... iii
Important safety information .................... iii
Online support ......................... iii
Chapter 1. General information...................1
Related publications .......................1
Notices and statements used in this book ...............2
Features and specifications.....................3
Server controls and indicators ....................4
Front view ..........................4
Rear view ..........................5
Turning on the server ......................6
Turning off the server ......................8
Standby mode ........................8
Chapter 2. Configuration.....................11
Using the Configuration/Setup Utility program..............11
Starting the Configuration/Setup Utility program ............11
Choices available from the Configuration/Setup Utility main menu .....11
Additional Configuration/Setup Utility menu choices ..........15
Using passwords .......................16
Using the SCSISelect utility program .................18
Starting the SCSISelect utility program ...............18
Choices available from the SCSISelect menu.............18
Using the ServerGuide Setup and Installation CD ............20
ServerGuide features .....................20
Setup and configuration overview .................21
System Partition .......................22
Typical NOS installation ....................22
Setting up or updating multiple servers ...............23
Installing your NOS without ServerGuide ..............23
Configuring the Gigabit Ethernet controller ...............23
High-performance Ethernet modes.................24
Ethernet port connector.....................24
Chapter 3. Diagnostics .....................25
General checkout ........................25
Diagnostic tools overview .....................27
POST error logs ........................27
Viewing error logs from the Configuration/Setup Utility program ......28
Viewing error logs from diagnostic programs .............28
Diagnostic programs and error messages ...............28
Text messages ........................28
Starting the diagnostic programs .................29
Diagnostic error message tables .................30
Identifying problems using status LEDs ................30
LEDs for Active PCI slots ....................31
Power-supply LEDs ......................31
Light path diagnostics .....................32
Error symptoms ........................33
Error symptom charts .....................33
Small computer system interface messages .............33
Memory errors ........................34
©Copyright IBM Corp. 2002 v

ServerGuide error symptoms...................34
Power checkout .......................35
Troubleshooting the Ethernet controller ...............35
Recovering the BIOS code ....................37
Chapter 4. Customer replaceable units ...............39
Before you begin ........................39
System reliability considerations .................39
Working inside the server with the power on .............39
Handling static-sensitive devices .................40
Major components of the xSeries 255 Type 8685 server..........40
System-board component locations .................42
System-board option connectors .................42
System-board internal cable connectors...............43
System-board external port connectors ...............44
System-board switches and jumpers ................45
System-board LED locations ...................47
Memory-board component locations ................48
Removing the top cover and bezel..................49
Removing the top cover (all models) ................49
Removing the bezel (rack model) .................49
Removing the bezel (tower model).................50
Working with adapters ......................51
Adapter considerations .....................51
Installing an adapter ......................53
Cabling aRAID or SCSI adapter .................56
Working with the optional xSeries 6-Pack Hot-Swap Hard Drive Expansion Kit 61
Installing the optional 6-Pack hot-swap drive backplane .........63
Installing internal drives......................71
Internal drive bays ......................71
Installing ahot-swap hard disk drive ................73
Installing a5.25-inch removable-media drive .............74
Installing memory modules ....................80
Installing an additional microprocessor ................87
Installing ahot-swap power supply .................96
Replacing ahot-swap fan .....................99
Replacing an internal fan.................... 100
Replacing an external fan ................... 101
Replacing the battery ...................... 101
Completing the installation .................... 104
Installing the top cover and bezel................. 105
Updating your server configuration ................ 107
Connecting external options.................... 107
SCSI cabling requirements ................... 108
Input/output connectors ..................... 108
Video port ......................... 109
Keyboard port ........................ 109
Auxiliary-device (pointing device) port ...............110
Ultra160 SCSI connectors ...................110
Serial ports .........................112
Universal Serial Bus ports ...................113
Gigabit Ethernet port .....................113
Integrated system management processor (ISMP) interconnect ports ...114
Cabling the server ......................114
Chapter 5. Service replaceable units................117
vi xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide

Microprocessor removal .....................117
SCSI backplane ........................118
Hot-swap board ........................119
Front-panel assembly ...................... 120
Power backplane ....................... 121
AC power box......................... 122
System board and shuttle .................... 123
Thermal grease ........................ 125
Chapter 6. Symptom-to-FRU index ................ 127
Beep symptoms ........................ 127
No-beep symptoms ....................... 130
Diagnostic panel system error LED ................. 130
Diagnostic error codes ..................... 133
Error symptoms ........................ 138
Power-supply LED errors..................... 145
POST error codes ....................... 146
Service processor error codes ................... 153
SCSI error codes ....................... 153
Temperature error messages ................... 153
Fan error messages ...................... 154
Power error messages ..................... 154
System shutdown ....................... 155
Voltage related system shutdown................. 155
Temperature related system shutdown ............... 155
DASD checkout ........................ 156
Host built-in self test (BIST).................... 156
Bus fault messages....................... 156
Undetermined problems ..................... 157
Problem determination tips .................... 158
Chapter 7. Parts listing, Type 8685 ................ 159
System ........................... 160
Keyboard CRUs ........................ 162
Power cord CRUs ....................... 163
Appendix A. Getting help and technical assistance .......... 165
Before you call ........................ 165
Using the documentation..................... 165
Getting help and information from the World Wide Web ......... 165
Software service and support ................... 166
Hardware service and support ................... 166
Appendix B. Related service information .............. 167
Safety information ....................... 167
General safety ....................... 167
Electrical safety ....................... 168
Safety inspection guide .................... 169
Handling electrostatic discharge-sensitive devices .......... 170
Grounding requirements .................... 170
Safety notices (multilingual translations) .............. 170
Appendix C. Notices ...................... 209
Edition notice ......................... 209
Trademarks.......................... 210
Important notes ........................ 210
Contents vii

Product recycling and disposal...................211
Battery return program......................211
Electronic emission notices .................... 212
Federal Communications Commission (FCC) statement ........ 212
Industry Canada Class Aemission compliance statement ........ 212
Australia and New Zealand Class Astatement ............ 212
United Kingdom telecommunications safety requirement ........ 212
European Union EMC Directive conformance statement ........ 212
Taiwanese Class Awarning statement ............... 213
Chinese Class Awarning statement ................ 213
Japanese Voluntary Control Council for Interference (VCCI) statement 213
viii xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide

Chapter 1. General information
The IBM Eserver xSeries 255 Type 8685 server, which features IBM
X-Architecture
™™ technology, is ahigh-performance server that can be upgraded to
asymmetric multiprocessing (SMP) server through amicroprocessor upgrade. It is
ideally suited for networking environments that require superior microprocessor
performance, efficient memory management, flexibility, and large amounts of reliable
data storage.
If you have access to the World Wide Web, you can obtain up-to-date information
about your server model and other IBM server products at
http://www.ibm.com/eserver/xseries/ on the World Wide Web.
Note: The illustrations in this document might differ slightly from your hardware.
Related publications
This Hardware Maintenance Manual and Troubleshooting Guide is provided in
Portable Document Format (PDF). It contains information to help you solve the
problem yourself or to provide helpful information to aservice technician.
In addition to this Hardware Maintenance Manual and Troubleshooting Guide,the
following xSeries 255 Type 8685 documentation is provided with the server:
vUser’s Guide
The User’s Guide provides general information about the server, including
information about features, how to configure the server, how to use the
ServerGuide
™ Setup and Installation CD, and how to get help.
vInstallation Guide
This printed publication contains setup and installation instructions.
vRack Installation Instructions
This printed publication contains the instructions to install the server in arack.
vSafety Information Book
This multilingual publication is provided in PDF on the IBM xSeries
Documentation CD. It contains translated versions of the caution and danger
©Copyright IBM Corp. 2002 1

statements that appear in the documentation for the server. Each caution and
danger statement has an assigned number, which you can use to locate the
corresponding statement in your native language.
vOption Installation Guide
This publication is provided in PDF on the IBM xSeries Documentation CD. It
contains instructions to install, remove, and connect optional devices supported
by your server.
Depending on your server model, additional publications might be included on the
IBM xSeries Documentation CD.
Notices and statements used in this book
The caution and danger statements used in this book also appear in the multilingual
Safety Information book provided on the IBM xSeries Documentation CD. Each
caution and danger statement is numbered for easy reference to the corresponding
statements in the safety book.
The following types of notices and statements are used in this book:
vNote: These notices provide important tips, guidance, or advice.
vImportant: These notices provide information or advice that might help you avoid
inconvenient or problem situations.
vAttention: 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.
vCaution: These statements indicate situations that can be potentially hazardous
to you. Acaution statement is placed just before the description of apotentially
hazardous procedure step or situation.
vDanger: These statements indicate situations that can be potentially lethal or
extremely hazardous to you. Adanger statement is placed just before the
description of apotentially lethal or extremely hazardous procedure step or
situation.
2xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide

Features and specifications
Table 1provides asummary of the features and specifications for your server.
1
Table 1. Features and specifications
Microprocessor:
vIntel
™® Xeon ™ MP
v1MB or 512 KB level-3 cache
depending upon model
v400 MHz front-side bus (FSB)
vSupport for up to four
microprocessors with Intel
Hyper-Threading technology and
Intel NetBurst
™ microarchitecture
Memory:
vMaximum: 12 GB
vType: ECC, double-data rate (DDR),
SDRAM, registered DIMMs
vSlots: 2-way or 4-way interleaved, 12
slots
vHot Spare memory
Drives standard:
vDiskette: 1.44 MB
vCD-ROM: IDE
Available expansion bays:
vHot-swap:
–Six slim-high in upper drive cage
–Six slim-high in lower drive cage
with optional SCSI backplane
installed
vNon-hot-swap: Two 5.25-inch
Expansion slots:
vSix hot-plug PCI-X 100 MHz/64-bit
vOne non-hot-plug PCI 33 MHz/32-bit
Hot-swap power supplies:
370 W(115-230 Vac)
vMinimum: Two
vMaximum: Four for redundancy
Redundant cooling:
Nine hot-swap fans
Video:
vATI RageXL video controller
vCompatible with SVGA and VGA
v8MB video memory
Size (tower model with sides and
wheels):
vHeight: 391 mm (15.4 in)
vDepth: 767 mm (30.2 in)
vWidth: 446 mm (17.6 in)
vWeight: 47 kg (104 lb) to 55 kg (121.2
lb) depending upon configuration
Size (7 U) (rack model without sides or
wheels):
vHeight: 307 mm (12.1 in)
vDepth: 767 mm (30.2 in)
vWidth: 446 mm (17.6 in)
vWeight: 47 kg (104 lb) to 55 kg (121.2
lb) depending upon configuration
Integrated functions:
vDual-channel Ultra160 SCSI controller
(one internal and one external channel)
vWake on LAN
® support
vOne Broadcom 10/100/1000 Mbps
Ethernet controller
vOne serial port
vFour Universal Serial Bus ports
vKeyboard port
vMouse port
vVideo port
vIntegrated system management
processor (ISMP) with two ISMP
(RS-485) RJ-45 connectors
Acoustical noise emissions:
vSound power, idle: 6.3 bel maximum
vSound power, operating: 6.3 bel
maximum
vBystander (1 m) Sound pressure,
operating: 47 dBa maximum
vBystander (1 m) Sound pressure, idle:
47 dBa maximum
Environment:
vAir temperature:
–Server on: 10° to 35°C (50° to 95°F).
Altitude: 0to 914 m(3000 ft).
–Server on: 10° to 32°C (50° to 89.6°F).
Altitude: 914 m(3000 ft) to 2133 m
(7000 ft).
–Server off: 10° to 43°C (50° to 110°F).
Maximum altitude: 2133 m(7000 ft).
v
Humidity:
–Server on: 8% to 80%
–Server off: 8% to 80%
Heat output:
Approximate heat output in British thermal
units (Btu) per hour:
vMinimum configuration: 461 Btu (0.14
kilowatts)
vMaximum configuration: 3412 Btu (1.0
kilowatts)
Electrical input:
vSine-wave input (50-60 Hz) required
vInput voltage low range:
–Minimum: 100 Vac
–Maximum: 127 Vac
vInput voltage high range:
–Minimum: 200 Vac
–Maximum: 240 Vac
v
Input kilovolt-amperes (kVA) approximately:
–Minimum: 0.08 kVA
–Maximum: 1.07 kVA
1. Racks are marked in vertical increments of 1.75 inches each. Each increment is referred to as aunit, or ″U.″A1-U-high device is
1.75 inches tall.
Chapter 1. General information 3

Server controls and indicators
This section identifies the controls and indicators on the front and rear of your
server.
Front view
Tower and rack models
System error LED
System information LED
Activity LED
Reset button
Power-control button
Power-on LED
Diskette drive
activity LED
Diskette-eject
button
CD-ROM drive
activity LED
CD-eject button
Hard disk drive
activity LED Hard disk drive
status LED
Notes:
1. The illustrations in this document might differ slightly from your hardware.
2. An amber LED illuminates when asystem error or event has occurred. To
identify the error or event, check the LEDs on the light path diagnostics panel
located on the server (see “Light path diagnostics” on page 32), or review the
Error Log in the Configuration/Setup Utility program (see “Viewing error logs
from the Configuration/Setup Utility program” on page 28). For more information
about the Configuration/Setup Utility program, see “Choices available from the
Configuration/Setup Utility main menu” on page 11.
Power-on (system power) LED: When this green LED is on, system power is
present in the server. When this LED flashes, the server is in Standby mode (the
system power supply is turned off and ac current is present). When this LED is off,
apower supply, ac power, or an LED has failed.
Power-control button: Press this button to manually turn the server on or off or to
place the server in Standby mode (see “Standby mode” on page 8).
Power-control button shield: You can install this circular disk over the
power-control button to prevent accidental manual power-off. This disk is provided
with your server.
Reset button: Press this button to reset the server and run the power-on self-test
(POST).
ACT (activity) LED: This green LED is on when there is activity on the server.
INFO (system information) LED: When this amber LED is on, the server power
supplies are nonredundant, or some other noncritical event has occurred. The event
4xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide

is recorded in the Error log. Check the light path diagnostics panel for more detailed
information (see “Light path diagnostics” on page 32).
FAULT (system-error) LED: This amber LED is on when asystem error occurs. An
LED on the light path diagnostics panel will also be on to further isolate the error.
Hard disk drive activity LED: Each hot-swap drive has ahard disk drive activity
LED. When this green LED is flashing, the drive is being accessed.
Hard disk drive status LED: Each hot-swap drive has ahard disk drive status
LED. When this amber LED is on continuously, the drive has failed. If an optional
SCSI or RAID adapter is installed in the server, when the LED flashes slowly (one
flash per second), the drive is being rebuilt. When the LED flashes rapidly (three
flashes per second), the controller is identifying the drive.
Diskette drive activity LED: When this LED is on, it indicates that the diskette
drive is in use.
Diskette-eject button: Press this button to release adiskette from the drive.
CD-ROM drive activity LED: When this LED is on, it indicates that the CD-ROM
drive is in use.
CD-eject button: Press this button to release aCD from the drive.
Rear view
Notes:
1. The illustrations in this document might differ slightly from your hardware.
2. An amber LED illuminates when asystem error or event has occurred. To
identify the error or event, check the LEDs on the light path diagnostics panel
located on the server, or review the Error Log in the Configuration/Setup Utility
program. For complete details about the light path diagnostics panel, see “Light
path diagnostics” on page 32. For more information about the
Configuration/Setup Utility program, see “Choices available from the
Configuration/Setup Utility main menu” on page 11.
Chapter 1. General information 5

Ethernet activity
LED Ethernet link
LED
Hot-swap fan error LED
AC power LED
DC power LED
Ethernet activity LED: When this green LED is on, there is activity between the
server and the network. The Ethernet activity LED is located on the Ethernet
(RJ-45) connector on the rear of the server.
Ethernet link LED: When this green LED is on, there is an active connection on
the Ethernet port. The Ethernet link LED is located on the Ethernet (RJ-45)
connector on the rear of the server.
Hot-swap fan error LEDs: These LEDs provide status information about fans 7, 8,
and 9(the bottom rear fans in the power-supply bays).
AC power LED: This green LED provides status information about the power
supply. During typical operation, both the ac and dc power LEDs are on.
DC power LED: This green LED provides status information about the power
supply. During typical operation, both the ac and dc power LEDs are on.
Turning on the server
Statement 13:
6xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide

DANGER
Overloading abranch circuit is potentially afire hazard and ashock hazard
under certain conditions. To avoid these hazards, ensure that your system
electrical requirements do not exceed branch circuit protection
requirements. Refer to the information that is provided with your device for
electrical specifications.
After you plug one end of each server power cord into the power-supply outlets on
the rear of the server and the other end of each power cord into an electrical outlet,
the server can start in any of the following ways:
vYou can press the power-control button on the front of the server to start the
server.
Notes:
1. You can install acircular disk over the power-control button to prevent
accidental manual power-off. This disk, known as the power-control button
shield, comes with your server.
2. After you plug the power cords of your server into the electrical outlets, wait
approximately 20 seconds before pressing the power-control button. During
this time, the ISMP is initializing; therefore, the power-control button does not
respond.
v
If the server is turned on and apower failure occurs, the server will start
automatically when power is restored.
vIf ac power is present, the server is in Standby mode, and the server is
connected to an Advanced System Management (ASM) interconnect network that
contains at least one system with an optional Remote Supervisor Adapter
installed, the server can be turned on from the Remote Supervisor Adapter user
interface.
vIf ac power is present, the server is in Standby mode, and an optional Remote
Supervisor Adapter is installed in the server, the server can be turned on from
the Remote Supervisor Adapter user interface.
vWhen you plug in your server for the first time, the Wake on LAN feature can
turn on the server.
vIf your server was previously turned on, it must be properly placed in Standby
mode for the Wake on LAN feature to turn on the server.
vIf your operating system supports the Preboot eXecution Environment (PXE)
option and the PXE option is enabled through the Planar Ethernet PXE/DHCP
menu choice under Start Options on the Configuration/Setup Utility program
menu (see “Using the Configuration/Setup Utility program” on page 11), the
integrated Gigabit Ethernet controller (see “Configuring the Gigabit Ethernet
controller” on page 23) can turn on the server.
Complete the following steps to manually turn on the server:
1. Review the information in “Before you begin” on page 39, “Handling
static-sensitive devices” on page 40, and “Safety information” on page 167.
2. Turn on all external devices, such as the monitor.
3. Plug the server power cords into the power source.
4. Press the power-control button on the front of the server.
Note: While the server is turning on, the power-on LED on the front of the
server is lit.
Chapter 1. General information 7

Turning off the server
The server can be turned off in any of the following ways:
vIf the system is connected to an ASM interconnect network that contains at least
one system with an optional Remote Supervisor Adapter installed, the system
can be turned off from the Remote Supervisor Adapter user interface.
vIf an optional Remote Supervisor Adapter is installed in the system, the system
can be turned off from the Remote Supervisor Adapter user interface.
Complete the following steps to manually turn off the server:
1. Review the information in “Before you begin” on page 39, “Handling
static-sensitive devices” on page 40, and “Safety information” on page 167.
2. See your operating system documentation for the proper procedure to shut
down the operating system.
When you turn off the server, observe the following precaution.
Statement 5:
CAUTION:
The power control button on the device and the power switch on the
power supply do not turn off the electrical current supplied to the device.
The device also might have more than one power cord. To remove all
electrical current from the device, ensure that all power cords are
disconnected from the power source.
1
2
3. Press the power-control button on the front of the server. This will put the server
in Standby mode.
Note: You might need to press and hold the power-control button for more than
4seconds to cause an immediate shutdown of the server and to force it
into Standby mode. You can use this feature if the operating system
stops functioning.
4. Disconnect the server from the power source.
Note: After disconnecting all the power cords, wait approximately 15 seconds
for your system to stop running. Watch for the power-on LED on the front
of the server to stop flashing.
Standby mode
Standby mode refers to the condition in which the server operating system is not
running and all core logic is shut down except for the optional Remote Supervisor
Adapter. In Standby mode, the server can respond to ISMP requests, such as a
remote request to turn on the server. When the server is in Standby mode, the
power-on LED on the front of the server flashes (when the server is running, the
power-on LED stays on and does not flash).
8xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide

You can put the server in Standby mode in any of the following ways:
vYou can press the power-control button on the server. This starts an orderly
shutdown of the operating system, if this feature is supported by your operating
system.
vIf the server is connected to an ASM interconnect network that contains at least
one system with an optional Remote Supervisor Adapter installed, the server can
be placed in Standby mode from the Remote Supervisor Adapter user interface.
vIf an optional Remote Supervisor Adapter is installed in the server, the server can
be placed in Standby mode from the Remote Supervisor Adapter user interface.
Attention: You must disconnect all the server power cords from the electrical
outlets to remove all power from the server.
Complete the following steps to put the server in Standby mode:
1. See the operating-system documentation for the proper procedure to shut down
the operating system.
Note: Each operating system is different. Read all the documentation about
shutting down the operating system before continuing.
2. Press the power-control button on the front of the server.
Notes:
a. After you place the server in Standby mode, wait at least 5seconds before
you turn on the server again.
b. You might need to press and hold the power-control button for more than 4
seconds to cause an immediate shutdown of the operating system and to
force it into Standby mode. You can use this feature if the operating system
stops functioning.
The ISMP can put the server in Standby mode as an automatic response to a
critical system failure. You can also put the server into Standby mode remotely by
means of an optional Remote Supervisor Adapter or through connection to an ASM
interconnect network.
Chapter 1. General information 9

10 xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide