IBM RS6000 Service Guide - Page 265

Service Request Numbers (SRNs) Service request numbers (SRNs) are generated for the SSA Hot-Swap Disk Drive by the system error-log analysis, system configuration code, diagnostics, and customer problem-determination procedures. SRNs help you to identify the cause of a problem, the failing field-replaceable units (FRUs), and the service actions that might be needed to solve the problem. The SRN Table Table A-1 on page A-6 lists the SRNs and describes the actions you should perform. The table columns are: SRN The service reference number. FRU list The FRU or FRUs that might be causing the problem (see also "FRU Names Used in the SRN Table" on page A-5). % How likely it is (by percentage) that the FRU is causing the problem. Problem A description of the problem and the action you must take. Abbreviations used in the table are: DMA Direct memory access FRU Field-replaceable unit IOCC Input/output channel controller POS Programmable option select (POS registers) POST Power-on self-test PAA P = adapter port number AA = SSA address Using the SRN Table Important: You should have been sent here from "SSA Maintenance Analysis Procedures (MAPs)." Do not start problem determination from the SRN table; always go to "SSA Maintenance Analysis Procedures (MAPs)" on page 2-35 first. 1. Locate the SRN in the table. If you cannot find the SRN, you have a problem with the diagnostics, the microcode, or the documentation. Call your support center for assistance. 2. Read carefully the "Action" you must perform for the problem. Do not exchange FRUs unless you are instructed to do so. Appendix A. SSA Problem Determination Procedures A-3