Supermicro 4020C-T, User Manual

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Chapter 3: System Interface
3-3
Power Fail (not used): Indicates a power supply module has failed. This
should be accompanied by an audible alarm. A backup power supply module will
take the load and keep the system running but the failed module will need to be
replaced. Refer to Chapter 6 for details on replacing the power supply. This LED
should be off when the system is operating normally.
3-4 Serial ATA Drive Carrier LED
Each Serial ATA drive carrier has a green LED. When illuminated, this green LED
(on the front of the Serial ATA drive carrier) indicates drive activity. A connec-
tion to the Serial ATA backplane enables this LED to blink on and off when that
particular drive is being accessed.
Note: The second LED on the SATA carriers is not used. .