Map 1542: I/O Problem Isolation - IBM pSeries 630 6C4 Service Manual

MAP 1542: I/O Problem Isolation

This MAP is used to locate defective FRUs not found by normal diagnostics. For this procedure,
diagnostics are run on a minimally configured system. If a failure is detected on the minimally configured
system, the remaining FRUs are exchanged one at a time until the failing FRU is identified. If a failure is
not detected, FRUs are added back until the failure occurs. The failure is then isolated to the failing FRU.
This I/O problem-determination MAP isolates I/O card and I/O subsystem failures. When I/O problem
isolation is complete, all cables and cards exhibiting a failure will have been replaced or reseated.
Notes:
1. This MAP assumes that a CD-ROM drive is installed in the base system and connected to an adapter
in the base system, and that a Diagnostics CD-ROM is available.
2. If a general-access password or privileged-access password is installed, you are prompted to enter the
password before the diagnostic CD-ROM can load.
3. The term POST indicators refers to the device mnemonics (words memory, keyboard, network,
SCSI, and speaker) that appear on the system console during the power-on self-test (POST).
4. The service processor may have recorded one or more symptoms in its error log. It is a good idea to
examine that error log before proceeding (see "System Information Menu" on page 376).
5. The service processor may have been set by the user to monitor system operations and to attempt
recoveries. You can disable these actions while you diagnose and service the system. If you disable
them, make notes of their current settings so that you can restore them easily. The following table lists
the settings:
Surveillance
Unattended Start
Reboot Policy
Call Out
The steps in this procedure will attempt to slow boot the system into service mode diagnostics. The
following procedure describes booting a nonpartitioned system with an attached 3151 console. The
procedure for booting a partitioned system with an attached HMC is slightly different and is described in
"Standalone Diagnostics Operations" on page 357. "Standalone Diagnostics Operation with an HMC
Attached to the System" describes the procedure for booting online disgnostics (6 key between the
keyboard and speaker indicators) and the following procedure requires booting standalone diagnostics (5
key between the keyboard and speaker indicators). Therefore, on a partitioned system, make sure the
partition you selected to boot in the following procedure has the CD-ROM allocated to it, as described in
Chapter 6, "Using the Online and Standalone Diagnostics", on page 353.
From the service processor Setup Menu, go to the
Surveillance Setup Menu and disable surveillance.
(Operating System Surveillance is disabled in LPAR
mode.)
From the service processor System Power Control Menu,
disable unattended start mode.
From the System Power Control Menu, go to the
Reboot/Restart Policy Setup Menu and set:
a. Number of reboot attempts to 0 (zero)
b. Use OS-Defined restart policy to No
c. Enable supplemental restart policy to No.
From the Call-In/Call-Out Setup Menu, go to the Serial
Port Selection Menu and disable call-out on both serial
ports.
Chapter 3. Maintenance Analysis Procedures (MAPs)
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