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86 Cheetah 10K.7 SCSI Product Manual, Rev. D
9.11 Drive activity LED
The following table provides drive activity LED status.
Table 22: Drive activity LED status
Spindle status Command status LED status
Spinning up with DC power applied N/A On until spinup is complete
Spun down Start Unit On while processing the command
Powered down by removal of DC
power
N/A Off due to absence of power
Spun up Stop Unit On while processing the command
Spun down No command activity Off
Spun down Write/Read Buffer On while processing the command
Spun down SCSI Bus Reset On while processing the reset
Spun down Test Unit Ready On while processing the command
Spun up No command activity Off
Spun up Write/Read On while processing the command
Spun up SCSI Bus Reset On while processing the reset
Spun up Test Unit Ready On while processing the command
Spun up Format with Immediate option on On while the command is initially processed
Spun up Format without Immediate LED toggles on/off on each cylinder
boundary