IBM 887022X Maintenance Manual - Page 71
Diagnostics
UPC - 000435151957
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Chapter 3. Diagnostics This section provides basic troubleshooting information to help resolve some common problems that might occur with the server. If you cannot locate and correct the problem using the information in this section, see Appendix A, "Getting help and technical assistance," on page 299 for more information. General checkout The server diagnostic programs (see "Starting the diagnostic programs" on page 70) are stored in the upgradeable electronically erasable programmable read-only memory (EEPROM) on the I/O board and on the Resource CD. These programs provide the primary methods of testing the major components of the server. If you cannot determine whether a problem is caused by the hardware or by the software, run the diagnostic programs to confirm that the hardware is working properly. Note: A single problem might cause several error messages. When this occurs, work to correct the cause of the first error message. After you correct the cause of the first error message, the other error messages usually will not occur the next time you run the test. A failed server might be part of a shared hard disk drive cluster (two or more servers sharing one or more external storage devices). Before you run diagnostics, verify that the failing server is not part of a shared storage device cluster. A server might be part of a cluster if: v The server is identified as part of a cluster. v One or more external storage units are attached to the server and at least one of the attached storage units is also attached to another server or unidentifiable source. v One or more servers are located near the failing server. If the failing server is suspected to be part of a shared hard disk drive cluster, run all diagnostic tests except those that test the storage unit (storage device residing in the storage unit) or the storage adapter attached to the storage unit. Notes: 1. For servers that are part of a shared hard disk drive cluster, run one test at a time. Do not run any suite of tests, such as "quick" or "normal" tests, because this could enable the hard disk drive diagnostic tests. 2. If multiple error codes are displayed, diagnose the first error code that is displayed. 3. If the server stops with a POST error, see "POST" on page 63. 4. If the server stops and no error is displayed, see "Undetermined problems" on page 246. 5. For power problems, see "Power LED errors" on page 240 and "12v bus faults" on page 229. 6. For safety information, see "Safety information" on page 257. 7. For intermittent problems, check the system-error log (see "Error logs" on page 65). © Copyright IBM Corp. 2003 61