IBM DR550, Problem Determination And Service Manual

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Table 7. Symptom-to-FRU index (continued)
Problem
indicator Component Possible cause Possible solutions
Amber LED is lit
(continued)
Front panel
(Global
Summary Fault
LED)
General machine
fault
A Fault LED is lit somewhere on
the storage subsystem (check for
Amber LEDs on CRUs).
General machine
fault (continued)
Open the DS4000 Storage
Manager for DR550 Storage
Subsystem Management window
and click on the Recovery Guru
to see problems in the DR550
Storage Controller configuration.
Some errors will cause the
Global Summary Fault LED to
be lit but will not cause any
individual CRU Fault LEDs to
be lit. (Drive PFA exceeded or
nominal temperature exceeded
errors are a few examples.)
Follow the corrective actions in
the Recovery Guru window.
Fibre channel
connection failure
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 subsystem. Replace the
failed SFP module. See the
DS4200 Installation, User’s and
Maintenance Guide for more
information.
Battery unit
fault
Battery unit failure Verify the failure using DS4000
Storage Manager Client and
replace the failing battery.
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.
Replace the failed power supply
or turn on all power supply
switches.
Amber and green
LEDs are lit.
Power supply
CRU
Power supply
failure or power
switch is turned off
or there is an AC
power failure.
Replace the failed power supply,
turn on all power supply
switches, or check the main or
the rack power unit circuit
breaker.
All amber and
green LEDs are
slowly flashing.
All drive CRUs The DR550 Storage Controllers are going through
start-of-day process (booting up). Wait up to five
minutes for the controllers to complete the booting
process. If the drive Activity LEDs are not steady lit
or momentarily flicker, and the amber LEDs are unlit
after waiting more than six minutes, contact IBM
support.
Chapter 6. DR550 Storage Controller
45