IBM DS4700 EXPRESS, Installation, User'S, And Maintenance Manual

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Table 51. Symptom-to-FRU index (continued)
Problem
indicator
Component Possible cause Possible solutions
One or more
green LEDs are
off Power supply
CRUs Power cable is
unplugged or
switches are turned
off. Make sure that the power cable
is plugged in and that the
switches are turned on.
All drive CRUs Midplane failure Replace the midplane. Contact
an IBM technical support
representative.
Several CRUs 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.
Front panel Power supply
problem Make sure that the power cables
are plugged in and that the
power supplies are turned on.
Hardware failure If any other LEDs are lit, replace
the midplane. Contact an IBM
technical support representative.
Intermittent or
sporadic power
loss to the storage
subsystem Some or all
CRUs Defective ac power
source or
improperly
connected power
cable Check the ac power source.
Reseat all installed power cables
and power supplies. If applicable,
check the power components
(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.
Unable to access
drives Drives and
fibre-channel
loop Incorrect storage
subsystem ID
settings Ensure that the fibre-channel
optical cables are undamaged
and properly connected. Check
the storage subsystem ID
settings.
Note: Change the switch
position only when your storage
subsystem is powered off.
RAID controller
failure Replace one or both RAID
controllers. Contact an IBM
technical support representative.
Drive or drives
failed Replace failed drive or drives.
Random errors Subsystem Midplane failure Have the midplane replaced.
Contact an IBM technical support
representative.
Chapter 6. Hardware maintenance
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