IBM RS6000 Service Guide - Page 65

SSA Maintenance Analysis Procedures (MAPs) These maintenance analysis procedures (MAPs) describe how to analyze a continuous failure that has occurred in a system that contains two or more disk drive modules. Failing field-replaceable units (FRUs) of the system unit can be isolated with these MAPs. How to Use These MAPs Attention: Switching off the power to an SSA Hot-Swap Disk Drive can cause a system fault unless you first make the SSA Hot-Swap Disk Drive modules unavailable to the system unit. To do this: 1. Use the system-management task menus to make the disk drive modules unavailable. 2. If the system unit has more than one SSA adapter, make the SSA Hot-Swap Disk Drive modules unavailable to the system for each of the paths to the SSA Hot-Swap Disk Drive. Attention: Unless the system unit needs to be switched off for some other reason, do not switch off the power to the system unit when servicing an SSA Hot-Swap Disk Drive or the external SSA cable. To isolate the FRUs associated with in the failing SSA Hot-Swap Disk Drive, perform the actions and answer the questions given in this MAP. When instructed to exchange two or more FRUs in sequence: 1. Exchange the first FRU in the list for a new one. 2. Verify that the problem is solved. For some problems, verification means running the diagnostic programs (see the using-system service procedures). 3. If the problem remains: a. Reinstall the original FRU. b. Exchange the next FRU in the list for a new one. 4. Repeat steps 2 and 3 until either the problem is solved, or all the related FRUs have been exchanged. 5. Perform the next action indicated by the MAP. The following table explains the meaning of the Power, Ready and Check status LEDs. Chapter 2. Maintenance Analysis Procedures 2-35