Specifications

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 and Abbreviations Used in the SRN Table
FRU names used in the table are as follows:
FRU Name in Table Definition
6-pack assembly The disk drive modules, blank disk drive modules,
and internal SSA cables, are connected to the
6-pack assembly.
Blank Disk drive module 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.
Disk drive module A disk drive assembly to a carrier that plugs into the
6-pack assembly in the system unit.
External SSA cable A cable that connects the bulkhead to the SSA
adapter or to an SSA subsystem.
Internal SSA cable A cable that attaches the 6-pack assembly to the
SSA adapter card.
SSA adapter card The SSA adapter card, which is located in the using
system.
Abbreviations used in the table are as follows:
Abbreviation in Table Definition
DMA Direct memory access
FRU Field-replaceable unit
IOCC Input/output channel controller
PAA P = adapter port number
AA = SSA address
POS Programmable option select (POS registers)
POST Power-on self-test
412 Service Guide