IBM Midrange System DS4000 Series Hardware Manual page 71

Controller support module LEDs
The controller support modules are located on the left side and right side in the front section
of the DS5000 storage subsystem, behind the front bezel panel. The two modules each
contain the power supplies and fans that are needed to operate the DS5000 storage
subsystem. The LED positions on the right and left power supply and fan units are in mirrored
positions. The LED indicator lights are shown in Figure 3-26.
Service Action Allowed
Needs attention
Power LED
Figure 3-26 Controller support module (power supply/fan) LEDs
Note: The right power supply and fan unit is linked with RAID controller A. The left power
supply and fan unit is linked with RAID controller B in the DS5000 storage subsystem.
The LEDs are:
Power LED (green):
– On: Power supply and fan unit is providing power.
– Off: Power supply and fan unit is not providing power.
Needs attention (amber):
– Off: Normal status.
– On: Power supply and fan unit needs attention.
Service action allowed (blue):
– Off: Normal status.
– On: Safe to remove.
Chapter 3. IBM System Storage DS4000 and DS5000 hardware
Power LED
Needs attention
Service Action Allowed
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