IBM RS6000 Service Guide - Page 272

Table A-1 (Page 5 of 9). Service Request Numbers SRN FRU List % 44PAA Disk drive module 100 45PAA Disk drive module 40 Backplane assembly 40 20 48000 None - 50000 SSA adapter card 100 50001 SSA adapter card 100 50002 SSA adapter card 100 50004 SSA adapter card 100 Problem Description: A disk drive module has failed. Action: If the SSA service aids are available, run the Link Verification service aid (see "Link Verification Service Aid" on page 3-73) to find the failing disk drive module. Before you exchange the failing disk drive module, run diagnostics in the system verification mode to the module to determine the cause of the problem. Description: The SSA adapter has detected an open SSA link. This problem is caused either by a disk drive module that is failing, or by a disk drive module that has been switched off from another using system on the same SSA link. (That using system has itself been switched off.) Action: If the SSA service aids are available, run the Link Verification service aid (see "Link Verification Service Aid" on page 3-73) to determine which device is preventing configuration. (That device is the one beyond the last-configured device on an open SSA link.) Description: The SSA adapter has detected a link configuration resource that is not valid. Action: See "SSA Loop Configurations That Are Not Valid" on page A-15. Description: The SSA adapter failed to respond to the device driver. Action: Exchange the FRU for a new FRU. Description: A data parity error has occurred. Action: Exchange the FRU for a new FRU. Description: An SSA adapter direct memory access (DMA) error has occurred. Action: Exchange the FRU for a new FRU. Description: A channel check has occurred. Action: Exchange the FRU for a new FRU. A-10 Service Guide