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Understanding Removable Disk Drive LEDs
Light-emitting diodes (LEDs) visible behind the disk drive bay door help you determine removable
disk drive activity and status at a glance. There are two LEDs for each disk drive, for a total of
eight removable disk drive LEDs.
Removable Disk Drive LEDs
The right LED above each removable disk drive flashes to show disk activity.
The left LED functions only when a SCSI Activity Fault-Tolerant Enclosure (SAF-TE) card is
installed on the disk drive backplane, and the backplane is connected to a SAF-TE compliant SCSI
or RAID controller.
On a system with RAID disk drives, an optional SAF-TE card monitors the status of RAID disk
drives. The SAF-TE card causes the left LED above each disk drive to indicate RAID disk drive
status as follows:
Left LED Activity
Disk Drive Status
Off
No error
Steady on
Disk drive rebuild stopped or disk drive is faulty
Steady blink (approx. 1 per second)
Disk drive rebuild in progress
Fast steady blink (approx. 3 per second)
Disk drive identification in progress
4 fast blinks, pause (repeats)
Disk drive experienced a predicted fault
2 fast blinks, pause (repeats)
Disk drive is a hot spare
To administer the RAID disk drives and the SAF-TE card, use the Mylex RAID configuration
utility as described in the Mylex documentation delivered with the system.
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