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Glossary
physical bus
Two SCSI terminators separated by cables, connectors, and backplane
circuitry.
port
(1) A logical route for data in and out of an array controller. A port
can contain one or more channels, all of which contain the same type
data. (2) The hardware and software that connects a host controller to
a Computer Interconnect (CI™), SCSI, or DIGITAL® standard
system interconnect (DSSI™) bus.
power verification and addressing assembly
See PVA.
PVA
Power verification and addressing assembly. The module whose
primary functions are (1) to allow the user to select the enclosure
UltraSCSI bus ID, (2) to enable the user to place the subsystem in a
standby power mode and return it to an operational status, (3) in
conjunction with the associated EMU, ensures that critical power
functions are monitored.
quiesce
To make a bus inactive or dormant. For example, the user must
quiesce SCSI bus operations when warm swapping a disk drive SBB.
radio frequency interference
See RFI.
RAID
Redundant array of independent disks. A set of storage techniques
devised to increase the performance and availability of a storage
subsystem.
UltraSCSI RAID Enclosure Glossary–11
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