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DuraStor 412R/6320SS/7320SS Installation and User's Guide
controller
A hardware device that performs I/O functions. Controllers also
perform other functions such as read and write caching and RAID
management. Also known as an adapter, embedded storage
controller, or subsystem.
D
disk array
See array.
disk drive
A physical disk drive on a SCSI bus. Drives are addressed by their
disk ID, which includes the channel (bus) number, SCSI ID, and
LUN. See also channel;
LUN (logical unit
number).
E
enclosure
A physical housing for drives, which can be connected internally or
externally to a computer. An enclosure usually contains one or
more power supplies, fans, and temperature sensors. The term
enclosure also applies to a SAF-TE-compliant backplane.See also
SAF-TE (SCSI Accessed Fault-Tolerant
Enclosure).
F
failback
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.
failover
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.
Glossary-2
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