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138 Sun Enterprise 220R Server Owner’s Guide • October 1999
About Troubleshooting Your System
The system provides the following features to help you identify and isolate
hardware problems:
■ Error indications
■ Software commands
■ Diagnostic tools
This section describes the error indications and software commands provided
to help you troubleshoot your system. Diagnostic tools are covered in “About
Diagnostic Tools” on page 118.
Error Indications
The system provides error indications via LEDs and error messages. Using the two
in combination gives one a high degree of confidence that you can isolate a problem
with a particular field-replaceable unit (FRU).
The system provides fault LEDs in the following places:
■ Front panel
■ Keyboard
■ Power supplies
Error messages are logged in the /var/adm/messages file and are also displayed
on the system console by the diagnostic tools.
Front Panel LEDs
System front panel LEDs provide your first indication if there is a problem with your
system. Usually, a front panel LED is not the sole indicator of a problem. Error
messages and even other LEDs can help to isolate the problem further.
The front panel has a general fault indicator that lights to indicate a problem with
the power supply subsystem. See “About the Status and Control Panel” on page 7
for more information about the two LEDs and their meanings.