Table 39. DS4800 Symptom-to-FRU index
Problem
indicator Component Possible cause Possible solutions
Amber Needs
Attention LED on
RAID controller
Needs Attention
LED
RAID controller offline If you have placed the controller offline, use the
DS4000 Storage Manager client software to place
it online.
If one controller has been placed offline by the
other controller, contact IBM support. (This is the
case if you use the DS4000 Storage Manager
client software to make repeated attempts to bring
an offline controller online, but the controller keeps
reverting back to an offline state.)
RAID controller failure If the RAID controller Needs Attention LED is on
and the Service Action Allowed LED for that RAID
controller is lit, replace the RAID controller.
If the Service Action Allowed LED for the RAID
controller is not lit, perform additional diagnostics
to identify other component failures. Replace the
other failed components before replacing the
RAID controller.
Drive bypass
LED
Fibre-channel cable is not
attached to the storage
expansion enclosure.
Connect the fibre-channel cable to the enclosure
port; check other connections.
No incoming signal
detected.
Reattach the SFPs and fibre-channel cables.
Verify that the fibre channel cables are in good
condition and that there are no cable management
issues (such as using plastic ties to wrap the
cables or bending the cable loops to less than 1.5
inches).
Verify the SFPs are working properly. Use the
wrap-plug coupler kit that ships with the DS4800
and the wrap-plug instructions in the DS4000
Problem Determination Guide.
Replace input and output SFPs or cables as
necessary.
Amber Needs
Attention LED on
(continued)
Overall DS4800
Configuration
Needs Attention
LED (located on
interconnect-
battery unit)
General system error Indicates that a Needs Attention LED somewhere
in the DS4800 storage subsystem configuration,
including all attached storage expansion
enclosures, has turned on. (Check for amber
LEDs on DS4800 components as well as all
attached storage expansion enclosures.) Use the
DS4000 Storage Manager software to diagnose
server problems.
Various DS4800
components
Multiple component failures Do not randomly replace components in the
DS4800. This might result in a subsystem
shutdown, causing a loss of data availability. Use
the DS4000 Storage Manager client program to
identify the failed components. Identify and
replace the failed power supply and fan unit
components first before fixing any other failed
components.
168 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide
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