IBM TotalStorage DS4300 Installation, User's, And Maintenance Manual page 178

Table 17. Storage subsystem troubleshooting (continued)
Problem
indicator
One or more
green LEDs off
(continued)
Intermittent or
sporadic power
loss to the storage
subsystem
150
IBM TotalStorage DS4300 Fibre Channel Storage Subsystem: Installation, User's, and Maintenance Guide
Component Possible cause
Expansion loop Drives are
improperly
installed or not
installed
RAID controller
has no power or
has failed
Impending drive
failure
Externally
attached
expansion port
Device (SFP, FC
cables or ESM)
has failed.
Some or all CRUs Defective ac
power source or
partially
plugged-in power
cord
Power supply has
failed
Operating
environment
temperature is >
40C
Midplane has
failed
Possible solutions
Ensure that the drives are
properly installed.
Ensure that the unit is powered
on. Replace the RAID controller.
A bad drive or drives can issue
LIPs that cause the drive
expansion loop to go down
momentarily. Use the RLS
function in the
storage-management software to
determine which drives are bad.
Replace the bad drives.
Replace the storage expansion
enclosure SFP, fibre-channel
cable or the storage expansion
enclosure ESM as appropriate.
Use the DS4000 storage
manager software and the
fiber-channel path diagnostic
procedure as documented in the
IBM TotalStorage DS4000
Problem Determination Guide to
troubleshoot the failing
component.
Check the ac power source;
verify that the ac circuit that the
storage subsystem connects to is
not being overloaded. Reseat all
installed power cables and power
supplies. If applicable, check the
power components. Replace
defective power cords.
Check for a Fault LED on the
power supply, and replace the
failed CRU.
Ensure that the adequate cooling
is available for the configuration.
Refer to the Heat, airflow and
cooling for rack guidelines to
ensure proper cooling.
Have the midplane replaced
(service technician only).