IBM System Storage Subsystem DS5020 - Manual (Page 186)

Table 20. Symptom-to-FRU index (continued)
Problem
indicator
Component Possible cause Possible solutions
All green LEDs
are off All CRUs Subsystem power is
off Check that all storage subsystem
power cables are plugged in and
the power switches are on. If
applicable, check that the main
circuit breakers for the rack are
powered on.
AC power failure Check the main circuit breaker
and ac outlet.
Power supply failure Replace the power supply.
Operating
environment is too
hot Cool down the environment.
Amber LED is
flashing Drive CRUs
(Fault LED lit) Drive identity is in
process No corrective action needed.
RAID controller
port bypass A Fibre Channel
loop initialization
process (LIP) is
being generated in
the drive loop due
to a faulty
component. Use the Read Link Status
window in the Storage Manager
Client Subsystem Management
window and the storage
subsystem event logs to isolate
the faulty component.
Controller drive
port bypass
LED The enclosure
speed was set to 4
Gbps but the SFP
inserted in the
controller drive SFP
port does not
operate at 4 Gbps. Use the Recovery Guru menu
function in the Storage Manager
Client Subsystem Management
window to verify the problem and
replace the SFP with a 4 Gbps
SFP.
General Fault
LED (located
on the front of
the storage
subsystem) An intermittent
failure in the
DS5020 storage
subsystem
configuration. The
problem could be
directly related to
the hardware in the
configuration (hard
drive or bad cable)
or indirectly related
to the DS5020
storage subsystem
configuration (such
as a Fibre Channel
host bus adapter
failure in the host
server or the Fibre
Channel switch in
the SAN causing
LUNs to be on a
non-preferred path.) Use the Recovery Guru menu
function in the Storage Manager
Client Subsystem Management
window to diagnose the problem.
156 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide