HP StorageWorks HSG80 Array Controller V8.7 Maintenance And Service Manual page 177

Glossary
The regeneration of an entire RAIDset member is called reconstruction. See also
reconstruction.
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.
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 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.
SCSI device ID number
A bit-significant representation of the SCSI address referring to one of the signal lines,
numbered 0 through 7 for an 8-bit bus, or 0 through 15 for a 16-bit bus. See also target ID
number.
SCSI ID number
The representation of the SCSI address that refers to one of the signal lines numbered 0
through 15.
SCSI port
(1) Software: The channel controlling communications to and from a specific SCSI bus in the
system. (2) Hardware: The name of the logical socket at the back of the system unit to which a
SCSI device is connected.
single ended I/O module
A 16-bit I/O module. See also I/O module.
single-ended SCSI bus
An electrical connection where one wire carries the signal and another wire or shield is
connected to electrical ground. Each signal logic level is determined by the voltage of a single
wire in relation to ground. This is in contrast to a differential connection where the second
wire carries an inverted signal.
spareset
A collection of disk drives used by the controller to replace failed members of a storageset.
storage array
An integrated set of storage devices.
HSG80 Array Controller V8.7 Maintenance and Service Guide Glossary–11