Light Path Diagnostics; Viewing The Light Path Diagnostic Leds - IBM power PS700 Problem Determination And Service Manual

Light path diagnostics

Light path diagnostics is a system of LEDs on the control panel and on the system board of the blade
server. When an error occurs, LEDs are lit throughout the blade server. If the control panel indicates an
error, use the descriptions of the LEDs to diagnose the problem and take corrective action.
LEDs are available for the following components:
v Battery
v SAS disk drive
v Management card
v Memory modules (DIMMs)
v PCIe high speed expansion card option
v 1Xe CIOv expansion card option
v System board and chassis assembly

Viewing the light path diagnostic LEDs

After reading required safety information, look at the control panel to determine if the LEDs indicate a
sub-optimal condition or an error.
View the system LEDs remotely through the Advanced Management Module Web interface. The main
LED page shows the external LEDs on the blade server. The internal blade LEDs are also available
through a blade hyperlink from the LED page. This enables you to see the status of the internal LEDs on
the blade server without having to turn off the blade server, remove it from the chassis, and activate the
light path indications.
Before working inside the blade server to view light path diagnostic LEDs, see the Safety topic and the
"Handling static-sensitive devices" on page 234 guidelines.
If an error occurs, view the light path diagnostic LEDs in the following order:
1. Look at the control panel on the front of the blade server. See "Blade server control panel buttons and
LEDs" on page 5.
v If the information LED is lit, it indicates that information about a suboptimal condition in the blade
server is available in the management-module event log.
v If the blade-error LED is lit, it indicates that an error has occurred and you should proceed to the
next step.
2. If an error has occurred, view the light path diagnostics panel and LEDs:
a. Remove the blade server from the BladeCenter unit.
b. Place the blade server on a flat, static-protective surface.
c. Remove the cover from the blade server.
d. Press and hold the light path diagnostics switch (blue button) to relight the LEDs that were lit
before you removed the blade server from the BladeCenter unit. The LEDs will remain lit for as
long as you press the switch, to a maximum of 25 seconds.
Figure 6 on page 215 shows the locations of LEDs on the system board.
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Power Systems: Problem Determination and Service Guide for the IBM Power PS700 (8406-70Y)