HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Maintenance and Service Guide (EK-G80MS-SA. C01, March 2005)

Glossary
275HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Maintenance and Service Guide
target ID number
The address a bus initiator uses to connect with a bus target. Each bus target is assigned a
unique target address.
“this controller”
The array controller that is serving your current CLI session through a local or remote terminal.
See also “other controller.”
transfer data rate
The speed at which data may be exchanged with the central processor, expressed in thousands
of bytes per second.
Ultra SCSI bus
A Fast-20 SCSI bus.
uninterruptible power supply
See UPS.
unit
A container made accessible to a host. A unit may be created from a single disk drive. A unit
may also be created from a more complex container such as a RAIDset. The array controller
supports a maximum of eight units on each target. See also target and target ID number.
UPS
Uninterruptible power supply. A battery-powered power supply guaranteed to provide power to
an electrical device in the event of an unexpected interruption to the primary power supply.
Uninterruptible power supplies are usually rated by the amount of voltage supplied and the
length of time the voltage is supplied.
VHDCI
Very High-Density-Cable Interface. A 68-pin interface that is required for Ultra SCSI connections.
virtual terminal
A software path from an operator terminal on the host to the array controller CLI, sometimes
called a host console. The path can be established through the host port on the array controller
or through the maintenance port through an intermediary host. See also maintenance terminal.
warm swap
A device remove and replace procedure using hot-pluggable method.
write-back cache
See cache module.
write-back caching
A cache management method used to decrease the subsystem’s response time to write requests
by allowing the array controller to declare the write operation complete as soon as the data
reaches its cache memory. The array controller performs the slower operation of writing the
data to the disk drives at a later time.