HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide (EK-G80TS-SA. C01, March 2005)

Glossary
296 HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide
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 arrive 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.
SCSI bus signal converter
(1) A device used to interface between the subsystem and a peripheral device unable to be
mounted directly into the SBB shelf of the subsystem. (2) A device used to connect a
differential SCSI bus to a single-ended SCSI bus. (3) A device used to extend the length of
a differential or single-ended SCSI bus.
See also DOC, DWZZA, DWZZB, DWZZC, and I/O module. Also called adapter, see
adapter.
SCSI device
(1) A host computer adapter, a peripheral controller, or an intelligent peripheral that can be
attached to the SCSI bus. (2) Any physical unit that can communicate on a SCSI bus.