Chapter 3: System Interface
3-3
!
Overheat:
Indicates a processor overheat condition. This may be
caused by cables obstructing the airflow in the system or the ambient room
temperature being too warm. You should also check to make sure that the
chassis covers are installed and that all fans are present and operating
normally. Finally, verify that the heatsinks are installed properly (see Chap-
ter 5).
!
Power Fail:
Indicates a power supply module has failed. The re-
maining two power supply modules will take the load to keep the system
running continuously, but the failed module will need to be replaced. You
do not need to shut down the system to replace the failed module. Refer to
Chapter 6 for details on replacing the power supply module. This LED
should be off when the system is operating normally.
3-4
SCSI Drive Carrier LEDs
Each SCSI drive carrier has two LEDs.
!
Green:
When illuminated, the green LED on the front of the SCSI drive
carrier indicates drive activity. A connection to the SCSI SCA backplane
enables this LED to blink on and off when that particular drive is being
accessed.
!
Red:
A SAF-TE compliant backplane (optional) is needed to activate
the red LEDs, which indicate a drive failure. Please refer to Chapter 6 for
instructions on replacing failed SCSI drives.
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