- IBM switch Users and Maintenance Guide

Table 17. Symptom-to-FRU index
Problem
indicator Component Possible cause Possible solutions
Amber LED on Drive CRU Drive failure Replace the drive that has failed.
Fan CRU Fan failure Replace the fan that has failed.
RAID controller
Fault LED
RAID controller
failure
If the RAID controller Fault LED
is on, replace the RAID controller.
If the RAID controller has been
placed offline by the user, use
storage management software to
place it online. If the controller
failed, replace the RAID
controller.
Attention:
In the DS4100
single-controller storage server,
the RAID controller Fault LED will
not light in the event of a RAID
controller failure or removal.
Expansion or host
port bypass LED
SFP port empty No corrective action is needed if
this is a stand-alone storage
server with no expansion units
attached, and if the system is
properly configured.
Otherwise, check to make sure
that the drive expansion unit is
powered on and the fibre channel
cables are attached properly.
Fibre-channel
cable is not
attached to the
expansion unit
Connect the fibre-channel cable
to the enclosure port; check other
connections.
No incoming
signal detected
Reattach the SFPs and
fibre-channel cables. Replace
input and output SFPs or cables
as necessary.
Front panel General system
error
Indicates that a Fault LED
somewhere on the storage server
has turned on. (Check for amber
LEDs on CRUs.) Use DS4000
Storage Manager software to
diagnose server problems.
Amber LED is off
and green LED off
Power-supply
CRU
Power switch is
turned off or ac
power failure
Turn on all power-supply power
switches.
Amber and green
LEDs on
Power-supply
CRU
Power supply
failure
Replace the failed power-supply
CRU.
112 IBM TotalStorage DS4100 Storage Server: Installation, User’s, and Maintenance Guide