Chapter 1 Tray Overviews 21
Service Action LEDs
Each controller, power-fan assembly, IOM, and disk drive has a Service Action
Allowed LED. The Service Action Allowed LED indicates when you can remove a
component safely. See “LEDs on the Rear of the Trays” on page 16 for the locations
and descriptions of the Service Action Allowed LEDs on a controller tray and a drive
expansion tray, and see “LEDs on the Disk Drives” on page 24 for disk drive Service
Allowed LEDs.
Caution – Potential loss of data access – Never remove a power-fan assembly, a
controller module, or a disk drive unless the Service Action Allowed LED is turned
on or you are given specific instructions to do so by the Service Advisor feature of
the Common Array Manager software.
If a CRU or module fails and must be replaced, the Service Action Required LED on
that module turns on to indicate that a service action is required. The Service Action
Allowed LED turns on if it is safe to remove the CRU or module. If there are data
availability dependencies or other conditions that dictate that a CRU or module
should not be removed, the Service Action Allowed LED remains off.
The Service Action Allowed LED automatically turns on or turns off as conditions
change. In most cases, the Service Action Allowed LED turns on when the Service
Action Required (Fault) LED is turned on for a CRU or module.
Note – If the Service Action Required (Fault) LED is turned on but the Service
Action Allowed LED is turned off for a particular CRU or module, you might have
to service another component first. Check the Service Advisor feature of the
Common Array Manager software to determine the action you should take.
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