APC RAID Subsystem SCSI-SATA II - Manual (Page 11)

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2.3 Identifying Parts of the subsystem
The illustrations below identify the various features of the subsystem. Get yourself
familiar with these terms as it will help you when you read further in the following
sections.
2.3.1 Front View
1. HDD status Indicator
Parts
Function
HDD Status LEDs
Green LED indicates power is on and hard drive status is good for
this slot. If hard drive defected in this slot or the hard drive is
failure, the LED is orange.
HDD access LEDs These LED will blink blue when the hard drive is being accessed.