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Troubleshooting and Problem Solving
4.5
Troubleshooting
The following sections describe common problems, with possible solutions, which can occur
with your DCS9550 1S1 Storage Expansion Unit
4.5.1
System Faults
Symptom
1 The SYSTEM LED will
2 Audible Alarm sound
4.5.2
Power Supply/Cooling Faults
Symptom
1 Ops Panel FAULT
2 An AMBER LED on
3 Audible Alarm
42
Cause
The ESI
processor has
illuminate AMBER on
detected an
the SCM
internal fault (e.g.
failure of an
internal
communications
path)
Note
See also Section 4.5.5.
Cause
1 Any power
LED AMBER
2 A fan failure.
one or more Power
Supply/Cooling
3 A thermal
Modules.
Sounding.
IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide
Action
1 Check for other AMBER LED indications on the
Power Supply/Cooling modules. If there is a
PSU error present there may be a
communications problem with that Power
Supply/Cooling module. Remove and then re-fit
the module, if the problem persists then change
the module.
2 Check for other AMBER LED indications on the
drive carriers. If none are evident then there may
either be an ESI processor problem or a
Backplane problem.
3 Ops Panel module faulty. Please contact your
supplier.
Action
1 Check Power On/Off Switch on rear of Power
fault.
Supply/Cooling module is switched ON.(not
accessible on later models)
2 Check AC Mains Connections to Power Supply/
Cooling module is live.
condition
which could
3 Disconnect the Power Supply/Cooling module
cause PSU
from mains power and remove the module from
overheating.
the system. Re-install: if problem persists,
replace Power Supply/Cooling Module.
4 Reduce the ambient temperature.
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