Dell 3 manual Logical Drive States, Enclosure Management, Logical drive states are listed in Table

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Ta b l e 2 - 3 . S C S I D r i v e S t a t e s (continued)

State	Description
Ready	The drive is functioning normally but is not part of a
(READY)	configured logical drive and is not designated as a hot spare.
Hot Spare	The drive is powered up and ready for use as a spare in case an
(HOTSP)	online drive fails.
Fail (FAIL)	A fault has occurred in the drive, placing it out of service.
Rebuild (REB)	The drive is being rebuilt with data from a failed drive.

Logical Drive States

The logical drive states are listed in Table 2-4.

Ta b l e 2 - 4 .	Log i c a l D r i ve S t a t es
State	Description
Optimal	The drive operating condition is good. All configured drives are
	online.
Degraded	The drive operating condition is not optimal. One of the
	configured drives has failed or is offline.
Failed	The drive has failed.
Offline	The drive is not available to the RAID controller.

Enclosure Management

Enclosure management is the intelligent monitoring of the disk subsystem by software and/or hardware. The disk subsystem can be part of the host computer or separate from it. Enclosure management helps you stay informed of events in the disk subsystem, such as a drive or power supply failure. Enclosure management increases the fault tolerance of the disk subsystem.

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Introduction to RAID