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Chapter 5. Diagnostics
This chapter describes the diagnostic tools that are available to help you solve
problems that might occur in the server.
If you cannot locate and correct the problem using the information in this chapter,
see Appendix A, "Getting help and technical assistance," on page 161 for more
information.
Diagnostic tools
The following tools are available to help you diagnose and solve hardware-related
problems:
v POST beep codes, error messages, and error logs
v Troubleshooting tables
v Light path diagnostics
v Diagnostic programs, messages, and error messages
v Real Time Diagnostics
POST
When you turn on the server, it performs a series of tests to check the operation of
the server components and some optional devices in the server. This series of tests
is called the power-on self-test, or POST.
If a power-on password is set, you must type the password and press Enter, when
prompted, for POST to run.
If POST is completed without detecting any problems, a single beep sounds, and
the server startup is completed.
If POST detects a problem, more than one beep might sound, or an error message
is displayed. See "Beep code descriptions" on page 66 and "POST error codes" on
page 73 for more information.
© Copyright IBM Corp. 2007
The power-on self-test (POST) generates beep codes and messages to indicate
successful test completion or the detection of a problem. See "POST" for more
information.
These tables list problem symptoms and actions to correct the problems. See
"Troubleshooting tables" on page 89.
Use light path diagnostics to diagnose system errors quickly. See "Light path
diagnostics" on page 102 for more information.
The diagnostic programs are the primary method of testing the major
components of the server. The diagnostic programs are in read-only memory on
the server. See "Diagnostic programs, messages, and error codes" on page 112
for more information.
Real Time Diagnostics can help you diagnose problems in certain devices while
the operating system is running, to prevent or minimize server downtime. See
"Real Time Diagnostics" on page 130 for more information.
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