IBM TotalStorage FAStT EXP700, Installation, User'S, And Maintenance Manual

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Table 17. Symptom-to-FRU index (continued)
Problem
indicator Component Possible cause Possible solutions
Intermittent or
sporadic power
loss to the storage
expansion
enclosure
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 UPS). 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.
Unable to access
drives
Drives and fibre
channel loop
Incorrect storage
expansion
enclosure ID
settings
Ensure that the fibre channel
optical cables are undamaged
and properly connected. Check
the storage expansion enclosure
ID settings.
Note: Change switch position
only when your storage
expansion enclosure is powered
off.
ESM failure Have one or both ESMs
replaced.
Random errors Subsystem Midplane feature Have the midplane replaced.
SFP Replace the SFP
Optical board Have the optical board replaced.
Switch harness Have the switch harness
replaced.
Hard disk drive is
not visible in RAID
management
software
Subsystem Check the HDD, FC cable, SFP,
and ESM. Have the midplane
replaced.
Amber
temperature LED
is enabled in the
RAID
management
software.
ESM board Check for the fan Fault LED.
The unit overheating; check the
temperature.
Replace the ESM board.
Amber conflict
LED is lit.
Note: It is normal
for the LED to be
lit when no SFP or
FC cable is
installed.
ESM board The enclosure IDs
of two or more
storage expansion
enclosures on the
same drive loop are
set to identical
values.
Using the x1 digit only, set the
enclosure ID for each storage
expansion enclosure in a drive
loop to a unique number 00 to
07.
Parts listing
Figure 59 on page 81 and the following tables provide parts listings for the DS4000
EXP700 and DS4000 EXP710.
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IBM TotalStorage DS4000 EXP700 and EXP710 Storage Expansion Enclosures: Installation, User’s, and Maintenance Guide