IBM H Series Installation And Service Manual page 198

2. Read carefully the "Action" you must perform for the problem. Do not exchange
FRUs unless you are instructed to do so.
3. Normally exchange only one FRU at a time, starting from the top of the FRU list
for that SRN. Always use instructions given in the page reference when
exchanging FRUs. After each FRU is exchanged, go to MAP 410: Repair
Checkout in Diagnostic Information for Multiple Bus Systems to verify the repair.
Software and Microcode Errors
Some SRNs indicate that a problem might have been caused by a software error or
by a microcode error. If you have one of these SRNs, perform the following actions:
1. Make a note of the contents of the error log for the device that has the problem.
2. Go to the using-system service aids and select Display Vital Product Data to
display the VPD of the failing system. Make a note of the VPD for all the SSA
adapters and disk drive modules.
3. Report the problem to your support center. The center can tell you whether you
have a known problem and can, if necessary, provide you with a correction for
the software or microcode.
FRU Names Used in the SRN Table
This section provides a glossary of the FRU names used.
FRU Name in Table
Backplane assembly
Disk drive module
Blank Disk drive module
External SSA cable
Internal SSA cable
SSA adapter card
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RS/6000 Enterprise Server Model H Series Installation and Service Guide
Definition
The disk drive modules, blank disk drive modules, and
internal SSA cables, are connected to the backplane
assembly.
A disk drive assembly to a carrier that plugs into the
backplane in the system unit.
This module must be installed in a slot that does not
contain a disk drive module. This completes the SSA
loop through the system unit.
A cable that connects the bulkhead to the SSA adapter
or to an SSA subsystem.
Attaches the backplane to the SSA adapter card.
The SSA adapter card, which is located in the using
system.