Light path diagnostics

Use this information as an overview of light path diagnostics.

Light path diagnostics is a system of LEDs on the control panel and on various internal components of the blade server or expansion unit. When an error occurs, LEDs can be lit throughout the blade server or expansion unit to help identify the source of the error.

After you remove the blade server or expansion unit, you can press and hold the light path diagnostics switch for a maximum of 25 seconds to light the LEDs and locate the failing component.

For information about the light path diagnostics on the IBM WebSphere DataPower Integration Blade XI50B appliance, see the Installation and User's Guide that came with the blade appliance.

• Viewing the light path diagnostics LEDs in the blade server
  Use this information to locate and identify the light path diagnostics LEDs.
• Blade server light path diagnostics LEDs
  Use this information to diagnose and resolve possible errors displayed by the light path diagnostic LEDs.
• Viewing the light path diagnostics LEDs in the BladeCenter GPU expansion unit
  When an error is indicated by the fault LED on the front of the BladeCenter GPU expansion (BGE) unit, these LEDs inside the expansion unit can be lit to help identify the source of the error. The fault LED on the blade server on which the expansion unit is installed is also lit. If the blade server supports transfer of error and LED information, fault-related information will be shown by the BladeCenter advanced management module (see the BladeCenter Advanced Management Module User's Guide for additional information).
• BladeCenter GPU expansion unit light path diagnostics LEDs
  Use this information to diagnose and resolve possible errors displayed by the light path diagnostic LEDs in the BladeCenter GPU expansion unit.