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Table 17. DS4500 Storage Subsystem LEDs (continued)
LED Color Normal status Problem status
Possible conditions indicated by the
problem status
1
Power supply
fault
Amber Off On
v One of the redundant power supplies has
failed or the power supply is turned off, has
power cable problems, or is not fully seated
in the DS4500.
v The temperature of the DS4500 is too high.
v If both power supplies have failed, are
turned off, or are disconnected, all of the
LEDs will not be off.
Storage
subsystem fan
fault
Amber Off On
v The storage subsystem fan has failed.
v The fan and communications module is
missing, unplugged, or has failed.
v The storage subsystem fan circuitry has
failed.
v The temperature of the DS4500 is too high.
Controller fault Amber Off On
v The RAID controller is restarting.
v The RAID controller has failed.
v One or more controller memory modules
have failed.
v One or more controller is idle. There are not
any I/Os.
Cache active
(Fast write
cache)
Green Steady or
blinking
2
Software
dependent
1
During normal operation, the indicator light is
not lit in the following conditions:
v The RAID controller cache is not enabled.
v The battery is not ready.
1
Always use the storage-management software to identify the failure.
2
The Cache active LED is on when there is data in the cache and blinks during a write operation.
Controller LEDs
Each RAID controller has ten LEDs: one power, one fault, and eight status, as
shown in Figure 89 on page 129.
Note: To view the controller LEDs, remove the DS4500 bezel (see “Removing the
front bezel” on page 32).
128 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide