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Appendix - Fault Isolation
Appendix A.
Fault Isolation
This section contains information used to troubleshoot faults in the system.
It contains the following subsections:
Component Status LEDs
System Error Log
A.1 Component Status LEDs
A.1.1 General LED information
LEDs can be in a three color arrangement, a two color arrangement or a single light.
General explanations or these categories follow
A.1.1.1 Three Color LED Arrangements
Most component status LEDs are grouped in threes, they are in a traffic-light configuration
(red on top, yellow in the middle, green on the bottom).
Generally, when a status light is illuminated, it indicates one of the following conditions*:
A red light indicates that the component is not functioning properly. In most cases, the component is broken and
needs to be replaced.
A yellow light indicates that the component is simplexed--that is, operating without a partner. Do not remove this
component. The yellow light is illuminated when the component is in the process of configuring itself with its
partner or when its partner has failed. Yellow LEDs can also indicate that a component is performing a self-test.
In most cases, removing a yellow-lit part from the system causes its function to be suspended
(except in the PCI card cage on HP-UX systems).
A green light indicates that the component is operating properly
* For the DNCP Series 400 (PA-8500), the Tray 1 Rectifier LED configuration is green/green/red, as explained in section
A.2.1.2a
A given status LED can also flash or remain steadily lit in combination with another status LED to indicate other
operating conditions, such as system power-up.
A.1.1.2 Two Color LED Arrangements
The disk drives and disk power supplies in the disk shelf (PSU0 and PSU1) have only two LEDS, red and green. When a
status light is illuminated, it indicates one of the following conditions:
a red and green light indicates a fault with the disk power supply.
a red light indicates a fault with the disk drive.
a green light on the PSU indicates that the system is operating properly.
a flashing green light on the disk drive indicates activity
A.1.1.3 Single LEDs