Light Path Diagnostics Feature; Identifying Problems Using The Light Path Diagnostics Feature - IBM eServer BladeCenter T8720 Installation And User Manual

Light path diagnostics feature

On the BladeCenter T system, the light path diagnostics feature consists of the
LEDs on the front and rear of the BladeCenter T unit and on the front of the
modules and blade servers. If a system-alarm LED on the system-status panels on
the BladeCenter T unit is lit, one or more error LEDs on the BladeCenter T
components also might be on. These LEDs help identify the cause of the problem.

Identifying problems using the light path diagnostics feature

This section provides the information to identify, using the light path diagnostics
feature, problems that might arise during installation.
To locate the actual component that caused the error, you must locate the lit error
LED on that component.
The following example illustrates how to use the light path diagnostics feature to
diagnose a system error:
1. Note that a BladeCenter T system-error LED is lit on the system-status panel.
2. Locate the module or blade server that also has an error LED lit (see Chapter 4,
"BladeCenter T components, controls, and LEDs," on page 51 for the location of
error LEDs; see the documentation that comes with your blade server for the
location of error LEDs on the blade server).
a. If the component is a module, replace the module.
b. If the component is a blade server with its system error LED lit, follow the
instructions in the documentation that comes with the blade server to isolate
and correct the problem.
Chapter 6. Solving problems
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