IBM TotalStorage DS4100 Installation, User's, And Maintenance Manual page 145

Table 17. Symptom-to-FRU index (continued)
Problem
indicator Component
All green LEDs off All CRUs
Amber LED Drive CRUs
flashing
One or more Power supply
green LEDs off CRUs
All drive CRUs
Front panel
Battery
Cache active
Host loop
Possible cause Possible solutions
Subsystem Check that all storage-server
power is off power cords are plugged in and
the power switches are on. If
applicable, check that the main
circuit breakers for the rack
cabinet are turned on.
AC power failure Check the main circuit breaker
and ac outlet.
Power supply Replace the power supply.
failure
Midplane failure Have the midplane replaced
(service technician only).
Drive identify is in No corrective action is needed.
process
Power cord Make sure that the power cord is
unplugged or plugged in and the power-supply
switches turned switches are turned on.
off
Midplane failure Have the midplane replaced
(service technician only).
Power supply Make sure that the cords are
problem plugged in and power supplies
are turned on.
Hardware failure If any other LEDs are on, replace
the midplane (service technician
only).
Battery failure Replace the battery.
The cache is Use the DS4000 Storage
disabled Manager client to enable the
logical drive read and write cache
settings.
The cache Replace the RAID controller.
memory has
failed
The cache Use the DS4000 Storage
battery has failed Manager client to check and
replace the battery.
Host or switch is Check if host or switch is on.
off or has failed Replace attached devices that
have failed.
Fibre-channel Ensure that the fibre-channel
cable has failed cables are undamaged and
properly connected.
SFP has failed Ensure SFP is seated properly;
replace SFP.
RAID controller Ensure that the unit is powered
has no power or on. Replace RAID controller.
has failed
Chapter 6. Hardware maintenance
113