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Table 38. Symptom-to-FRU index (continued)
Problem
indicator
Component
One or more
Power supply
green LEDs are
CRUs
off
All drive CRUs
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.
The EXP810 is
Verify that the EXP810 is
connected to an
connected to a supported
unsupported
DS4000 storage subsystem. Use
DS4000 storage
the steps "Finding controller,
subsystem such as
storage expansion enclosure, and
a DS4200 Express.
drive information" on page 72 to
identify which storage subsystem
is connected. Replace the
incorrect storage subsystem with
a correct one.
The enclosure
Verify that all of the storage
speed is not the
expansion enclosures and
same as other
DS4000 storage subsystem
storage expansion
enclosure speeds are the same.
enclosures and
Use the procedure in "Verifying
DS4000 storage
the Link Rate setting " on page
subsystem in the
101 to correct the problem.
same redundant
drive channel pair.
Incorrect SFPs are
Verify and replace the SFPs with
used such as a 2
the correct speed SFPs.
Gbps SFP used
when the EXP810
enclosure speed is
set to 4 Gbps.
The EXP810 is not
Verify and correct the incorrect
cabled or incorrectly
cabling if required.
cabled to other
storage expansion
enclosures or
DS4000 storage
subsystem. For
example, ESM ports
labeled 2A and 2B
were used instead
of ports labeled 1A
and 1B.
Drive CRUs are not
Verify that the drives are seated
fully inserted in the
correctly in the drive slots.
drive slots.
Remove and reinsert the drive
CRUs if required.
Midplane failure
Replace the midplane. Contact
an IBM technical support
representative.
Chapter 6. Hardware maintenance
129
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