Logical Drive States; Enclosure Management; Table 2-4. Logical Drive States - Dell PowerEdge Expandable RAID Controller 3 User Manual

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In t ro duc ti o n to RAI D
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
configured logical drive and is not designated as a hot spare.
(READY)
Hot Spare The drive is powered up and ready for use as a spare in case an
online drive fails.
(HOTSP)
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 . L o g i c a l D r i v e S t a t e s
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.