IBM DS3950, Installation, User'S, And Maintenance Manual, Page: 186 / 252

Table 22. Symptom-to-FRU index (continued)
Problem indicator Component Possible cause Possible solutions
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
(Fault and
Power LEDs lit;
SAA lit; Direct
Current Enable
LED is not lit)
Power supply
failure Replace the failed power supply.
Operating
environment is too
hot Cool down the environment.
Fan failure Replace the power supply and
fan unit CRU
All amber and
green LEDs are
slowly flashing All drive CRUs The DS3950 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.
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.
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IBM System Storage DS3950 Storage Subsystem: Installation, User’s, and Maintenance Guide