IBM F50 RS/6000 7025 User manual

IBM RS/6000 7025 F50 Series IBM
User's Guide
SA38-0540-01

Second Edition (February 1998)
The following paragraph does not apply to the United Kingdom or any country where
such provisions are inconsistent with local law: THIS PUBLICATION IS PROVIDED “AS
IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR 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. The manufacturer may make improvements and/or changes in the
product(s) and/or the program(s) described in this publication at any time, without notice.
It is possible that this publication may contain reference to, or information about, products
(machines and programs), programming, or services that are not announced in your country.
Such references or information must not be construed to mean that these products,
programming, or services will be announced in your country. Any reference to a specific
licensed program in this publication is not intended to state or imply that you can use only that
licensed program. You can use any functionally equivalent program instead.
Requests for technical information about products should be made to your authorized reseller
or marketing representative.
 International Business Machines Corporation 1997, 1998. 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
Communications Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Federal Communications Commission (FCC) Statement .............. vii
International Electrotechnical Commission (IEC) Statement ............ vii
United Kingdom Telecommunications Safety Requirements ............ vii
European Union (EU) Statement ............................ viii
Avis de conformité aux normes du ministère des Communications du Canada . viii
Canadian Department of Communications Compliance Statement ........ viii
VCCI Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
Radio Protection for Germany ............................. ix
European Union (EU) Statement ............................. x
VCCI Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x
Safety Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Electrical Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Laser Safety Information ................................ xiii
Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
About This Book .................................... xvii
ISO 9000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Chapter 1. System Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Before You Begin ..................................... 1-2
Unpacking Your System ................................. 1-3
Connecting the Cables .................................. 1-5
Starting the System ................................... 1-6
Finishing the Installation ................................. 1-8
Chapter 2. Using the System Unit ......................... 2-1
Starting the System Unit ................................. 2-1
Stopping the System Unit ................................ 2-1
Reading the Operator Panel Display .......................... 2-3
Using the Keyboards ................................... 2-4
Using the Three–Button Mouse ............................. 2-6
Using the 3.5–Inch Diskette Drive .......................... 2-10
Using the CD–ROM Drive ............................... 2-12
Using the Hot Swap Disk Drives ........................... 2-15
General Information for 8-mm Tape Drive ..................... 2-20
Using the 5.0GB 8-mm Tape Drive ......................... 2-24
General Information for 4.0GB 4-mm Tape Drive ................. 2-31
Preface iii

Using the 4.0GB 4-mm Tape Drive ......................... 2-37
Chapter 3. System Management Services ..................... 3-1
Graphical System Management Services ....................... 3-1
Config . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
MultiBoot: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Error Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
RIPL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
SCSI ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Text-Based System Management Services ..................... 3-24
Chapter 4. Service Processor Menus ....................... 4-1
Service Processor Menus ................................ 4-3
General User Menus ................................... 4-4
Privileged User Menus .................................. 4-6
Service Processor Functions and Features ..................... 4-24
Chapter 5. Installing Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Handling Static-Sensitive Devices ........................... 5-3
Expansion Bays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Input/Output Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Removing the Front Covers Only ........................... 5-6
Removing Both the Front and Side Covers ..................... 5-10
Removing the I/O Planar Cover ........................... 5-16
Option List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
Installing Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18
Memory-Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
Removing Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28
Installing Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-30
Removing Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-34
Upgrading or Adding a CPU Card .......................... 5-37
Installing Internal Drives ................................ 5-41
Installing a Disk Drive, Tape Drive, or CD-ROM in Bay A or Bay B ....... 5-44
Installing a SCSI Disk Drive in Bank C, D, or E. .................. 5-51
Installing a SSA Disk Drive in Bank C, D, or E. .................. 5-55
Installing a SCSI Backplane in Bank D or E .................... 5-59
Installing a SSA Backplane in Bank D, or E .................... 5-66
Removing Internal Drives ............................... 5-81
Removing a Disk Drive, Tape Drive, or CD-ROM from Bay A or Bay B .... 5-82
Removing a SCSI Disk Drive from Bank C, D, or E ................ 5-83
iv IBM RS/6000 7025 F50 Series User's Guide

Removing a SSA Disk Drive from Bank C, D, or E ................ 5-87
Installing a U-Bolt .................................... 5-91
Replacing the Front Covers .............................. 5-93
Replacing Both the Front and Side Covers ..................... 5-96
Replacing the I/O Planar Cover .......................... 5-101
Chapter 6. Using the Online and Standalone Diagnostics ........... 6-1
Sources for the Diagnostics ............................... 6-1
Standalone and Online Diagnostics Operating Considerations ........... 6-1
Online Diagnostics Modes of Operation ........................ 6-9
Standalone Diagnostic Operation .......................... 6-12
Location Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Physical Location Codes ............................... 6-14
AIX and Physical Location Code Reference Table ................. 6-15
AIX Location Codes .................................. 6-20
Chapter 7. Using the Service Aids ......................... 7-1
Introduction to Service Aids ............................... 7-3
AIX Shell Prompt Service Aid .............................. 7-4
Backup/Restore Media Service Aid .......................... 7-4
Configure Remote Maintenance Policy Service Aid ................. 7-4
Configure Ring Indicate Power On Policy Service Aid ................ 7-6
Configure Surveillance Policy Service Aid ...................... 7-7
Configure Reboot Policy Service Aid ......................... 7-7
Save or Restore Hardware Management Policies Service Aid ........... 7-9
Diagnostic Package Utility Service Aid ........................ 7-9
Dials and LPFK Configuration Service Aid ..................... 7-10
Disk Based Diagnostic Update Service Aid and Update Disk Based Diagnostic
Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Disk Media Service Aids ................................ 7-10
Disk Maintenance Service Aid ............................ 7-12
Diskette Media Service Aid .............................. 7-13
Display or Change Configuration or Vital Product Data (VPD) Service Aid ... 7-13
Display and Change Diagnostic Test List Service Aid ............... 7-15
Display Previous Diagnostic Results Service Aid ................. 7-16
Display Test Patterns Service Aid .......................... 7-16
Enhanced SCSI Display Configuration Service Aid ................ 7-16
Generic Microcode Download Service Aid ..................... 7-17
Hardware Error Report Service Aid and Display Hardware Error Log Task .. 7-17
ISA Adapter Configuration Service Aid ....................... 7-17
Machine Check Error Log Service Aid ........................ 7-18
Microcode Download Service Aid .......................... 7-18
Periodic Diagnostics Service Aid ........................... 7-19
SCSI Bus Analyzer Task ............................... 7-20
Preface v

SCSI Tape Utilities Service Aid ............................ 7-22
Service Hints Service Aid ............................... 7-23
Update System or Service Processor Flash Service Aid ............. 7-23
Display Firmware Device Node ............................ 7-24
Display Resource Attributes .............................. 7-24
7135 RAIDant Array Service Aid ........................... 7-25
PCI RAID Physical Disk Identify ........................... 7-25
Chapter 8. Using the System Verification Procedure .............. 8-1
Step 1. Considerations before Running This Procedure .............. 8-1
Step 2. Loading the Diagnostics ............................ 8-2
Step 3. Running System Verification .......................... 8-3
Step 4. Additional System Verification ......................... 8-3
Step 5. Stopping the Diagnostics ............................ 8-4
Chapter 9. Hardware Problem Determination ................... 9-1
Problem Determination Using the Standalone or Online Diagnostics ....... 9-1
Problem Determination When Unable to Load Diagnostics ............ 9-10
Appendix A. System Records . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Record the Identification Numbers .......................... A-1
Device Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Appendix B. Replacing the Battery ........................ B-1
Appendix C. Service Processor Setup and Test ................ C-1
Testing the Setup .................................... C-2
Appendix D. Modem Configurations . . . . . . . . . . . . . . . . . . . . . . . D-1
Sample Modem Configuration Files ......................... D-1
Configuration File Selection .............................. D-2
Seamless Transfer of a Modem Session ...................... D-6
Modem Configuration Samples ............................ D-9
Appendix E. Service Processor Operational Phases ............. E-1
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-1
Reader's Comments — We'd Like to Hear From You ............. X-3
vi IBM RS/6000 7025 F50 Series User's Guide

Communications Statements
Federal Communications Commission (FCC) Statement
Note: This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause
harmful interference in which case the user will be required to correct the
interference at his own expense.
Properly shielded and grounded cables and connectors must be used in order to
meet FCC emission limits. Neither the provider nor the manufacturer are responsible
for any radio or television interference caused by using other than recommended
cables and connectors or by unauthorized changes or modifications to this
equipment. Unauthorized changes or modifications could void the user's authority to
operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference,and (2)
this device must accept any interference received, including interference that may
cause undesired operation.
International Electrotechnical Commission (IEC) Statement
This product has been designed and built to comply with IEC Standard 950.
United Kingdom Telecommunications Safety Requirements
This equipment is manufactured to the International Safety Standard EN60950 and
as such is approved in the UK under the General Approval Number
NS/G/1234/J/100003 for indirect connection to the public telecommunication network.
The network adapter interfaces housed within this equipment are approved
separately, each one having its own independent approval number. These interface
adapters, supplied by the manufacturer, do not use or contain excessive voltages. An
excessive voltage is one which exceeds 70.7 V peak ac or 120 V dc. They interface
with this equipment using Safe Extra Low Voltages only. In order to maintain the
separate (independent) approval of the manufacturer's adapters, it is essential that
Preface vii

other optional cards, not supplied by the manufacturer, do not use main voltages or
any other excessive voltages. Seek advice from a competent engineer before
installing other adapters not supplied by the manufacturer.
European Union (EU) Statement
This product is in conformity with the protection requirements of EU Council Directive
89/336/EEC on the approximation of the laws of the Member States relating to
electromagnetic compatibility.
Neither the provider nor the manufacturer can accept responsibility for any failure to
satisfy the protection requirements resulting from a non–recommended modification
of the product, including the fitting of option cards not supplied by the manufacturer.
This product has been tested and found to comply with the limits for Class B
Information Technology Equipment according to CISPR 22 / European Standard EN
55022. The limits for Class B equipment were derived for typical residential
environments to provide reasonable protection against interference with licensed
communication devices.
Avis de conformité aux normes du ministère des Communications du
Canada
Cet appareil numérique de la classe A respecte toutes les exigences du Réglement
sur le matériel brouilleur du Canada.
Canadian Department of Communications Compliance Statement
This Class A digital apparatus meets the requirements of the Canadian
Interference–Causing Equipment Regulations.
VCCI Statement
The following is a summary of the VCCI Japanese statement in the box above.
viii IBM RS/6000 7025 F50 Series User's Guide

This is a Class B product based on the standard of the Voluntary Control Council for
Interference from Information Technology Equipment (VCCI). If this is used near a
radio or television receiver in a domestic environment, it may cause radio
interference. Install and use the equipment according to the instruction manual.
When used near a radio or TV receiver, it may become the cause of radio
interference.
Read the instructions for correct handling.
Radio Protection for Germany
Dieses Gerät ist berechtigt in Übereinstimmung mit dem deutschen EMVG vom
9.Nov.92 das EG–Konformitätszeichen zu führen.
Der Aussteller der Konformitätserklärung ist die IBM Germany.
Dieses Gerät erfüllt die Bedingungen der EN 55022 Klasse B.
Preface ix

Note: If any of the following Feature Codes are installed:
3615, 4356, 4357, 4358, 4359, 6218, 8130, or 8134,
or if a configuration using more than one SysKonnect FDDI adapter (Feature
Codes 2741, 2742, or 2743) where any one of them is Feature Code 2743
(SysKonnect SK-NET FDDI-UP SAS PCI), the following statement applies:
European Union (EU) Statement
This product is in conformity with the protection requirements of EU Council Directive
89/336/EEC on the approximation of the laws of the Member States relating to
electromagnetic compatibility. The manufacturer cannot accept responsibility for any
failure to satisfy the protection requirements resulting from a non-recommended
modification of the product, including the fitting of option cards supplied by third
parties. Consult with your dealer or sales representative for details on your specific
hardware.
This product has been tested and found to comply with the limits for Class A
Information Technology Equipment according to CISPR 22 / European Standard EN
55022. The limits for Class A equipment were derived for commercial and industrial
environments to provide reasonable protection against interference with licensed
communication equipment.
Attention: This is a Class A product. In a domestic environment this product may
cause radio interference in which case the user may be required to take adequate
measures.
VCCI Statement
The following is a summary of the VCCI Japanese statement in the box above.
This is a Class A product based on the standard of the Voluntary Control Council for
Interference by Information Technology Equipment (VCCI). If this equipment is used
in a domestic environment, radio disturbance may arise. When such trouble occurs,
the user may be required to take corrective actions.
xIBM RS/6000 7025 F50 Series User's Guide

Safety Notices
A danger notice indicates the presence of a hazard that has the potential of causing
death or serious personal injury.
A
caution notice indicates the presence of a hazard that has the potential of causing
moderate or minor personal injury.
Electrical Safety
Observe the following safety instructions any time you are connecting or
disconnecting devices attached to the workstation.
DANGER
An electrical outlet that is not correctly wired could place hazardous
voltage on 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.
Before installing or removing signal cables, ensure that the power
cables for the system unit and all attached devices are unplugged.
When adding or removing any additional devices to or from the system,
ensure that the power cables for those devices are unplugged before
the signal cables are connected. If possible, disconnect all power
cables from the existing system before you add a device.
Use one hand, when possible, to connect or disconnect signal cables
to prevent a possible shock from touching two surfaces with different
electrical potentials.
During an electrical storm, do not connect cables for display stations,
printers, telephones, or station protectors for communication lines.
CAUTION:
This product is equipped with a three–wire power cable and plug for the user's
safety. Use this power cable with a properly grounded electrical outlet to avoid
electrical shock.
Preface xi

DANGER
To prevent electrical shock hazard, disconnect the power cable from
the electrical outlet before relocating the system.
xii IBM RS/6000 7025 F50 Series User's Guide

Laser Safety Information
The optical drive in this system unit is a laser product. The optical drive has a label
that identifies its classification. The label, located on the drive, is shown below.
CLASS1LASERPRODUCT
LASERKLASSE1
LUOKAN1LASERLAITE
APPAREIL A LASERDECLASSE1
IEC825:1984 CENELECEN60825:1991
The optical drive in this system unit is certified in the U.S. to conform to the
requirements of the Department of Health and Human Services 21 Code of Federal
Regulations (DHHS 21 CFR) Subchapter J for Class 1 laser products. Elsewhere,
the drive is certified to conform to the requirements of the International
Electrotechnical Commission (IEC) 825 (1st edition 1984) and CENELEC EN 60
825:1991 for Class 1 laser products.
CAUTION:
A class 3 laser is contained in the device. Do not attempt to operate the drive
while it is disassembled. Do not attempt to open the covers of the drive as it
is not serviceable and is to be replaced as a unit.
Class 1 laser products are not considered to be hazardous. The optical drive
contains internally a Class 3B gallium-arsenide laser that is nominally 30 milliwatts at
830 nanometers. The design incorporates a combination of enclosures, electronics,
and redundant interlocks such that there is no exposure to laser radiation above a
Class 1 level during normal operation, user maintenance, or servicing conditions.
Preface xiii

Power Cables
1234
567
8
9
10 11
Index Part Number Country
1 1838574 Bahamas, Barbados, Bolivia, Brazil, Canada, Costa Rica,
Dominican Republic, El Salvador, Ecuador, Guatemala, Guyana,
Haiti, Honduras, Jamaica, Japan, Netherlands Antilles, Panama,
Peru, Philippines, Taiwan, Thailand, Trinidad, Tobago, U.S.A.
(except Chicago), Venezuela
2 6952300 Bahamas, Barbados, Bermuda, Bolivia, Brazil, Canada, Cayman
Islands, Colombia, Costa Rica, Dominican Republic, Ecuador, El
Salvador, Guatemala, Guyana, Haiti, Honduras, Jamaica, Japan,
Korea (South), Mexico, Netherlands Antilles, Nicaragua, Panama,
Peru, Philippines, Puerto Rico, Saudi Arabia, Suriname, Trinidad,
Taiwan, U.S.A. (except Chicago), Venezuela
2 62X1045 Chicago, U.S.A.
3 6952311 Argentina, Australia, New Zealand
4 13F9979 Abu Dhabi, Austria, Belgium, Bulgaria, Botswana, Egypt, Finland,
France, Germany, Greece, Iceland, Indonesia, Korea (South),
Lebanon, Luxembourg, Macau, Netherlands, Norway, Portugal,
Saudi Arabia, Spain, Sudan, Sweden, Turkey, Yugoslavia
5 13F9997 Denmark
6 14F0015 Bangladesh, Burma, Pakistan, South Africa, Sri Lanka
7 14F0033 Bahrain, Bermuda, Brunei, Channel Islands, Cyprus, Ghana,
Hong Kong, India, Iraq, Ireland, Jordan, Kenya, Kuwait, Malawi,
Malaysia, Nigeria, Oman, People's Republic of China, Qatar,
Sierra Leone, Singapore, Tanzania, Uganda, United Arab
Emirates (Dubai), United Kingdom, Zambia
xiv IBM RS/6000 7025 F50 Series User's Guide

Index Part Number Country
8 14F0051 Liechtenstein, Switzerland
9 14F0069 Chile, Ethiopia, Italy
10 14F0087 Israel
11 6952291 Paraguay, Colombia, Uruguay
Preface xv

xvi IBM RS/6000 7025 F50 Series User's Guide

About This Book
This book provides information on how to install and remove options, use the
system, use diagnostics, use service aids, and verify system operation. This book
also provides information to help you solve some of the simpler problems that might
occur.
ISO 9000
ISO 9000 registered quality systems were used in the development and
manufacturing of this product.
Related Publications
The following publications are available:
The
IBM RS/6000 7025 F50 Series Service Guide contains reference
information, maintenance analysis procedures (MAPs), error codes, removal and
replacement procedures, and a parts catalog.
The
IBM RS/6000 Diagnostic Information for Multiple Bus Systems contains
diagnostic information, service request numbers (SRNs), and failing function
codes (FFCs).
The
IBM RS/6000 Adapter, Device, and Cable Information for Multiple Bus
Systems contains information about adapters, devices, and cables for your
system. This manual is intended to supplement the service information found in
the IBM RS/6000 Diagnostic Information for Multiple Bus Systems .
The
Site and Hardware Planning Information contains information to help you
plan your installation.
Trademarks
AIX is a registered trademark of the International Business Machines
Corporation.
PowerPC is a trademark of the International Business Machines Corporation.
Preface xvii

xviii IBM RS/6000 7025 F50 Series User's Guide

Chapter 1. System Startup
Thank you for selecting an IBM RS/6000 7025 F50 Series system!
The IBM RS/6000 7025 F50 Series system combines PowerPC 604 microprocessor
performance and system expandability, ensuring that your system adapts to handle
ever-changing operating requirements. The system is specifically designed to
support the demands of network environments.
The IBM RS/6000 7025 F50 Series system incorporates the new, advanced
peripheral component interconnect (PCI) bus, which is faster than the industry
standard architecture (ISA) bus. But the system also offers ISA as a additional bus
architecture, to accommodate businesses that already have invested in ISA and
ISA-based devices.
This book helps you set up and use the system, install and remove options,
configure the system, and use the system programs that are provided. This book
also provides information to help you solve some of the simpler problems that might
occur, and how to obtain assistance and service. Appendix A, “System Records” on
page A-1 provides a section for you to record all the important information about
your system.
Chapter 1. System Startup 1-1

Before You Begin
Make sure you have an adequate number of properly grounded electrical outlets
for your system, display, and any other options you intend to install.
Place your system in a location that is dry. Rain or spilled liquids might damage
your system.
Always operate your system in the upright position and do not place any heavy
objects on top of your system.
Leave about 51 mm (2 in.) of space on all sides of the system to allow the
system's cooling system to work properly.
Collect the following tools, and keep them handy:
– Small flat-blade screwdriver
– Medium flat-blade screwdriver
– Trays to hold screws
Before continuing, refer to the
System Unit Safety Information book for Danger
and Caution notices. Do not plug any cables into system unit, adapters, or
electrical outlets until you have reviewed this information.
Make sure none of the power cords are connected before continuing.
1-2 IBM RS/6000 7025 F50 Series User's Guide