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GL–14 Glossary
RFI Radio Frequency Interference. The disturbance of a signal by an unwanted
radio signal or frequency.
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.
SBB Storage Building Block. (1) A modular carrier plus the interface required to
mount the carrier into a standard StorageWorks shelf. (2) any device
conforming to shelf mechanical and electrical standards installed in a 3.5-
inch or 5.25-inch carrier, whether it is a storage device or power supply.
SCSI Small computer system interface. (1) An 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-A cable A 50-conductor (25 twisted-pair) cable generally used for single-ended,
SCSI-bus connections.
SCSI bus signal
converter
Sometimes referred to as an adapter. (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 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.