Table 56. Symptom-to-FRU index (continued)
Problem
indicator
Component
Possible cause
Possible solutions
One or more
Green LEDs off
Controller Cache
LED off
Caching is not enabled or
was disabled because:
v
The cache memory in
controllers A and B is
mismatched.
v
The battery is charging or
performing a diagnostic
test.
v
One of the cache backup
battery packs has failed.
Or, there are no I/Os being
sent to the storage
subsystem.
Enable write-caching using the DS Storage
Manager client program.
Or:
v
Use the DS Storage Manager client program to
verify the cache memory for both controllers.
v
The performs battery diagnostic tests and
recharges every 25 hours. The test duration
time varies depending on the recharging
requirement, but the duration should be less
than 15 minutes.
v
Replace the failing battery.
If there are no I/Os being sent to the storage
subsystem, generate I/Os to send to the storage
subsystem.
Battery LED off
and power
supply and fan
unit Power LED
off
The battery is missing.
Verify that the battery is missing. The DS5100 and
DS5300 ships with both cache battery packs
installed. Call IBM support if a cache battery pack
is missing and you did not remove any of the
cache battery packs from the storage subsystem.
L1 and L2 (Link
Speed) LEDs for
a host port
Fibre channel cable is not
attached to the host port or
the FC device that should
be connected to this host
port.
Connect the fibre channel cable to the enclosure
port; check other connections.
No FC 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. For specific handling guidelines, see
“Handling fibre-optic cables” on page 48.
Verify the SFPs are working properly. Use the
wrap-plug coupler kit that ships with the storage
subsystem and the wrap-plug instructions in the
Problem Determination Guide
.
Replace input and output SFPs or cables as
necessary.
L1 and L2 (Link
Speed) LEDs of
drive port
SFP module failure or SFP
module not seated properly.
Reseat the SFP.
Verify the SFPs are working properly. Use the
wrap-plug coupler kit that ships with the storage
subsystem and the wrap-plug instructions in the
Problem Determination Guide
.
Replace SFPs as necessary.
Only one Blue
Service Action
Allowed LED is
lit with no other
amber Needs
Attention LEDs lit
Interconnect-
battery unit
A command from the
Subsystem Management
window placed the
interconnect-battery unit in
Identify/Locate mode.
Stop the Identify/Locate action in the Subsystem
Management window.
206
IBM System Storage DS5100 and DS5300 Storage Subsystem: Installation, User’s, and Maintenance Guide
