IBM 88371RU, Maintenance And Troubleshooting Manual

Page: 77 / 186

Chapter 5. Diagnostics
This section provides basic troubleshooting information to help solve 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 127 for more
information.
General checkout
Follow the checkout procedure (see “Checkout procedure” on page 68) for
diagnosing hardware problems. Review the following information before performing
the checkout procedure:
v
Read Appendix B, “Safety information,” on page 129.
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, error codes, and messages” on
page 70) 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 codes” on page 88.
4. If the server is suspended and no error message is displayed, see “Error
symptoms” on page 103 and “Undetermined problems” on page 119.
5. For information about power-supply problems, see “Power checkout” on page
79.
6. For intermittent problems, check the error logs; see “Diagnostic programs,
error codes, and messages” on page 70.
© Copyright IBM Corp. 2002, 2007
67