IBM DR550, Problem Determination And Service Manual

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Table 7. Symptom-to-FRU index (continued)
Problem
indicator Component Possible cause Possible solutions
Unable to access
drives.
Drives and
fibre-channel
loop
Incorrect enclosure
speed settings
Ensure that the fibre-channel
optical cables are undamaged
and properly connected. Check
the enclosure speed settings.
Note: Change the enclosure
speed 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.
Hard disk drive
not visible in
RAID
management
software.
Several CRUs Drive or drives
failed
Replace failed drive or drives.
FC cable failed Replace FC cable.
SFP failed Replace SFP.
RAID controller
failure
Replace RAID controller.
Unsupported
storage expansion
enclosure connected
Verify that the attached storage
expansion enclosures are
supported. In this release, the
DR550 Storage Controller only
supports DR550 Expansion
Drawers (EXP420) not EXP810s.
Drive CRU has
interface problem
with the ESM or
controller.
Replace the drive CRU.
Incorrect firmware
version
Verify that the DR550 Storage
Controller has the correct
firmware version. See DS4200
Installation, User's and
Maintenance Guide.
Midplane failure Have the midplane replaced.
Contact an IBM technical
support representative.
Parts listing
Figure 8 on page 49 and the following table provide a parts listing for the DR550
Storage Controller.
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DR550 Version 4.5 Problem Determination and Service Guide