Status Severity Alarm
Over temperature alarm Fault – critical S4
I
2
C bus failure Fault – loss of redundancy S1
Ops panel communication error (I
2
C) Fault – critical S1
RAID error Fault – critical S1
SBB interface module fault Fault – critical S1
SBB interface module removed Warning None
Drive power control fault Warning – no loss of disk
power
S1
Drive power control fault Fault – critical – loss of disk
power
S1
Drive removed Warning None
Insucient power available Warning None
For details about replacing modules, see Replacing an IOM.
NOTE: Using the ME Storage Manager, monitor the storage system event logs for information about enclosure-related events,
and to determine any necessary recommended actions.
PCM faults
Table 21. PCM recommended actions
Symptom Cause Recommended action
Ops panel Module Fault LED is amber
1
Any power fault Verify AC mains connections to PCM are
live
Fan Fail LED is illuminated on PCM
2
Fan failure Replace PCM
1 See Figure 28. LEDs: Ops panel—2U enclosure front panel for visual reference of Ops panel LEDs.
2 See Table 11. PCM LED states for visual reference of PCM LEDs.
Thermal monitoring and control
The storage enclosure system uses extensive thermal monitoring and takes a number of actions to ensure component temperatures are
kept low, and to also minimize acoustic noise. Air ow is from the front to the back of the enclosure.
Table 22. Thermal monitoring recommended actions
Symptom Cause Recommended action
If the ambient air is below 25ºC
(77ºF), and the fans are
observed to increase in speed,
then some restriction on airow
The rst stage in the thermal
control process is for the fans to
automatically increase in speed
when a thermal threshold is
1 Check the installation for any airow restrictions at either the
front or back of the enclosure. A minimum gap of 25 mm (1")
at the front and 50 mm (2") at the rear is recommended.
2 Check for restrictions due to dust build-up. Clean as
appropriate.
40 Troubleshooting and problem solving
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