IBM F50 RS/6000 7025 - Manual (Page 45)

SSA Disk Drives: The following table explains the meaning of the Power, Ready
and Check status LEDs.
Status LEDs
LED Status Definition
Power On Power On
Off Power Off
Ready On Both SSA connections good and
drive is ready
Blinking Only one SSA connection good
Flickering Drive is executing a command
Check On Disk drive failure
Self-test running
Drive in service mode
Blinking Disk drive selected
Chapter 2. Using the System Unit 2-19