Adaptec DuraStor 7220SS User Manual page 124

Glossary
E
enclosure
A physical housing for disk drives, which can be connected
externally to a computer. An enclosure usually contains one or
more power supplies, fans, and temperature sensors. See also
SAF-TE (SCSI Accessed Fault-Tolerant Enclosure).
enclosure ID
Enclosures that are controlled by a SAF-TE or SES (SCSI Enclosure
Services) processor are identified by an enclosure ID. The
enclosure ID consists of the channel (bus) number, SCSI ID (also
known as target ID), and LUN (Bus:ID:LUN). For example, 1:04:0.
See also channel; LUN; SCSI ID.
enclosure management device
See enclosure.
F
failback
When a storage system is in active-active mode, failback is the act
of returning ownership of controller resources from a surviving
controller to a previously failed (but now active) controller. The
resources include disk arrays, cache data, and host ID information.
See also storage system.
failover
The process by which the controller rebuilds data onto a spare disk
drive when a disk drive that is part of a redundant array fails.
When a storage system is in active-active mode, failover is the act
of temporarily transferring ownership of controller resources from
a failed controller to a surviving controller. The resources include
disk arrays, cache data, and host ID information.
forced reset (kill)
See kill.
free space
The space on an initialized disk drive that is not being used by an
array. Arrays are created from free space. When an array is
deleted, its space is returned to free space. See also array.
Glossary-3