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Table 33. Symptom-to-FRU index (continued)
Problem
indicator
Component
One or more
Power supply
green LEDs are
CRUs
off
All drive CRUs
Several CRUs
Front panel
Intermittent or
Some or all
sporadic power
CRUs
loss to the storage
subsystem
Possible cause
Possible solutions
Power cable is
Make sure that the power cable
unplugged or
is plugged in and that the
switches are turned
switches are turned on.
off
Midplane failure
Replace the midplane. Contact
an IBM technical support
representative.
Both controllers are
The DS4200 Express controllers
in the start-of-day
are going through start-of-day
process (booting
process (booting up). Wait up to
up).
five minutes for the controllers to
complete the booting process. If
the drive Activity LEDs are not
steady lit or momentarily flicker,
and the amber LEDs are unlit
after waiting more than six
minutes, contact IBM support.
Hardware failure
Replace the affected CRUs. If
this does not correct the problem,
replace the RAID controllers,
followed by the midplane.
Contact an IBM technical support
representative.
Power supply
Verify that the power cables are
problem
plugged in and the power
supplies are turned on.
Hardware failure
If any other LEDs are lit, replace
the midplane. Contact an IBM
technical support representative.
Defective AC power
Check the AC power source.
source or
Reseat all installed power cables
improperly
and power supplies. If applicable,
connected power
check the power components
cable
(power units or universal power
supply). Replace defective power
cables.
Power supply failure Check the power supply Fault
LED on the power supply. If the
LED is lit, replace the failed CRU.
Midplane failure
Have the midplane replaced.
Contact an IBM technical support
representative.
Chapter 6. Hardware maintenance
139
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