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Glossary–22
HSG80 Array Controller V8.7 Command Line Interface Reference Guide
Glossary
regeneration
(1) The process of calculating missing data from redundant data. (2) The process of recreating
a portion of the data from a failing or failed drive using the data and parity information from
the other members within the storageset.
The regeneration of an entire RAIDset member is called reconstruction. See also
reconstruction.
remote copy
A feature intended for disaster tolerance and replication of data from one storage subsystem or
physical site to another subsystem or site. Remote copy also provides methods of performing a
backup at either the local or remote site. With remote copy, user applications continue to run
while data movement goes on in the background. Data warehousing, continuous computing,
and enterprise applications all require remote copy capabilities.
remote copy set
A bound set of two units, one located locally and one located remotely for long distance
mirroring. The units can be a single disk, or a storageset, mirrorset, or RAIDset. A unit on the
local controller is designated as the “initiator” and a corresponding unit on the remote
controller is designated as the “target.” See also association set.
replacement policy
The policy specified by a switch with the SET FAILEDSET command indicating whether a
failed disk from a mirrorset or RAIDset is to be automatically replaced with a disk from the
spareset. The two switch choices are AUTOSPARE and NOAUTOSPARE.
request rate
The rate at which requests are arriving at a servicing entity.
RFI
Radio Frequency Interference. The disturbance of a signal by an unwanted radio signal or
frequency.
SCSI
Small Computer System Interface. (1) An American National Standards Institute (ANSI)
interface standard defining the physical and electrical parameters of a parallel I/O bus used to
connect initiators to devices. (2) A processor-independent standard protocol for system-level
interfacing between a computer and intelligent devices including hard drives, floppy disks,
CD-ROMs, printers, scanners, and others.