IBM 8840 Hardware Maintenance Manual - Page 21
Diagnostics
UPC - 000435863799
View all IBM 8840 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 21 highlights
Chapter 3. Diagnostics This section provides basic troubleshooting information to help you resolve some common problems that might occur with your 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 115 for more information. General checkout Follow the checkout procedure for diagnosing hardware problems. Review the following information before performing the checkout procedure: v Read Appendix B, "Safety information," on page 117. v The server diagnostic programs are stored in upgradeable read-only memory (ROM) on the system board. These programs provide the primary methods of testing the major components of the server. If you are not sure whether a problem is caused by the hardware or by the software, you can run the diagnostic programs (see "Diagnostic programs and error messages" on page 14) to confirm that the hardware is working correctly. v When you run the diagnostic programs, a single problem might cause several error messages. If you receive several error messages, correct the cause of the first error message. The other error messages might not occur the next time you run the diagnostic programs. v Before running the diagnostic programs, you must determine whether the failing server is part of a shared hard disk drive cluster (two or more servers sharing external storage devices). If you suspect that it is part of a cluster, you can run all diagnostic programs except the ones that test the storage unit (that is, a hard disk drive in the storage unit) or the storage adapter that is attached to the storage unit. The failing server might be part of a cluster if any of the following conditions is true: - The customer identifies the failing server as part of a cluster. - One or more external storage units are attached to the failing server and at least one of the attached storage units is also attached to another server or unidentifiable device. - One or more servers are located near the failing server. v Important: 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 more than one error code is displayed, correct the first error. The other error codes might not occur the next time you run the diagnostic programs. 3. If the server is suspended and a POST error code is displayed, see "POST error logs" on page 13. 4. If the server is suspended and no error message is displayed, see "Error symptoms" on page 90 and "Undetermined problems" on page 103. 5. For information about power-supply problems, see "Power checkout" on page 19. 6. For intermittent problems, check the error logs; see "Diagnostic programs and error messages" on page 14. © Copyright IBM Corp. 2005 11