IBM H Series Installation And Service Manual page 100

The following table explains the meaning of the Power, Ready, and Check status
LEDs.
LED Status
Power On
Off
Ready On
Blinking
Flickering
Check On
Blinking
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RS/6000 Enterprise Server Model H Series Installation and Service Guide
Status LEDs
Definition
Power On
Power Off
Both SSA connections good and
drive is ready
Only one SSA connection good
Drive is executing a command
Disk drive failure
Self-test running
Drive in service mode
Disk drive selected