About Troubleshooting Your System; Error Indications; Front Panel Leds - Sun Microsystems Enterprise 250 Owner's Manual

About Troubleshooting Your System

The system provides the following features to help you identify and isolate hardware
problems:

4 Error indications

4 Software commands
4 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 234.
Error Indications
The system provides error indications via LEDs and error messages. Using the two
in combination, you can isolate a problem to a particular field-replaceable unit (FRU)
with a high degree of confidence.
The system provides fault LEDs in the following places:
4 Front panel
4 Keyboard
4 Power supplies
4 Disk drives
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

Front panel LEDs provide your first indication if there is a problem with your
system. Usually, a front panel LED is not the sole indication 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 whenever POST or OBDiag
detects any kind of fault. It addition, it has LEDs that indicate problems with the
internal disk drives, power supply subsystem, or fans. See "About the Status and
Control Panel" on page 6 for more information on these LEDs and their meanings.
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Diagnostics and Troubleshooting