About Troubleshooting Your System - 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:
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 216.
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:
Front panel
Keyboard
Power supplies
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 (
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 8 for more information on these LEDs and their
meanings.
242 Sun Enterprise 250 Server Owner's Guide • June 1998
) that lights whenever POST or