HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Command Line Interface Reference Guide (EK-G80CL-RA. C01, March 2005)

Glossary
332 HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Command Line Interface Reference Guide
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.
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.
Also called adapter. See also DWZZA, DWZZB, DWZZC, and I/O module.
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.