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

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Solving problems
Table 17. Symptom-to-FRU index
Problem
indicator Component Possible cause Possible solutions
Amber LED is lit Drive CRU Drive failure Replace failed drive.
Fan CRU Fan failure Replace failed fan.
ESM
over-
temperature
LED
Subsystem is
overheated
Check fans for faults. Replace
failed fan if necessary.
Environment is too
hot
Check the ambient temperature
around the storage expansion
enclosure. Cool as necessary.
Defective LED or
hardware failure
If you cannot detect a fan failure
or overheating problem, replace
the ESM.
ESM Fault LED ESM failure Replace the ESM. See your
controller documentation for more
information.
ESM Bypass
LED
No incoming signal
detected
Reconnect the SFP modules and
fibre channel cables. Replace
input and output SFP modules or
cables as necessary.
ESM failure If the ESM Fault LED is lit,
replace the ESM.
Front panel General machine
fault
A Fault LED is lit somewhere on
the storage expansion enclosure
(check for Amber LEDs on
CRUs).
SFP transmit fault Check that the CRUs are
properly installed. If none of the
amber LEDs are lit on any of the
CRUs, this indicates an SFP
module transmission fault in the
storage expansion enclosure.
Replace the failed SFP module.
See your storage-manager
software documentation for more
information.
Amber LED is lit
and green LED is
off
Power-supply
CRU
The power switch is
turned off or there is
an ac power failure
Turn on all power-supply
switches.
Reseat or replace power supply.
Replace the power cord.
Amber and green
LEDs are lit
Power-supply
CRU
Power-supply failure Replace the failed power-supply
CRU.
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IBM TotalStorage DS4000 EXP700 and EXP710 Storage Expansion Enclosures: Installation, User’s, and Maintenance Guide