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Table 23. Symptom-to-FRU index (continued)
Problem
indicator
Unable to access
drives
Random errors
Hard disk drive
not visible in RAID
management
software
Parts listing
Figure 52 on page 108 and the following table provide a parts listing for the
EXP420.
Component
Possible cause
Drives and
Incorrect storage
fibre-channel
expansion
loop
enclosure ID
settings
ESM failure
Drive or drives
failed
Drive is not certified Check the DS4000 product Web
Subsystem
Midplane failure
Several CRUs
Drive or drives
failed
FC cable failed
SFP failed
ESM failure
Midplane failure
Incorrect firmware
version
Possible solutions
Ensure that the fibre-channel
optical cables are undamaged
and properly connected. Check
the storage expansion enclosure
ID settings.
Note: Change the switch
position only when your storage
expansion enclosure is powered
off.
Replace one or both ESMs.
Contact an IBM technical support
representative.
Replace failed drive or drives.
site for the correct drive option
P/N or FRU P/N certified for your
DS4000 storage subsystem.
Have the midplane replaced.
Contact an IBM technical support
representative.
Replace failed drive or drives.
Replace FC cable.
Replace SFP.
Replace ESM.
Have the midplane replaced.
Contact an IBM technical support
representative.
Verify that the DS4000 storage
subsystem has the correct
firmware version. Refer to
"Software and firmware support
code upgrades" on page 9.
Chapter 6. Hardware maintenance
107
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