HP StorageWorks HSG80 ACS Solution Software V8.8 for Tru64 UNIX Installation and Configuration Guide (AA-RV1VA-TE, March 2005)

Glossary
288 HSG80 ACS Solution Software V8.8 for Tru64 UNIX Installation and Configuration Guide
tape inline
exerciser
(TILX) The controller diagnostic software to test the data transfer
capabilities of tape drives in a way that simulates a high level of user
activity.
topology An interconnection scheme that allows multiple Fibre Channel ports to
communicate with each other. For example, point-to-point, Arbitrated
Loop, and switched fabric are all Fibre Channel topologies.
transfer data
rate
The speed at which data may be exchanged with the central processor,
expressed in thousands of bytes per second (kbytes).
transparent
failover
Keeps the storage array available to the hosts by allowing the surviving
controller of a dual redundant pair to take over total control of the
subsystem and is transparent (invisible) to the hosts.
ULP
ULP process
Upper Layer Protocol.
A function executing within a Fibre Channel node which conforms to
the Upper Layer Protocol (ULP) requirements when interacting with
other ULP processes.
Ultra SCSI A Fast-20 SCSI bus. See also Wide Ultra SCSI.
unit A container made accessible to a host. A unit may be created from a
single disk drive or tape drive. A unit may also be created from a more
complex container such as a RAIDset. The controller supports a
maximum of eight units on each target. See also target and target ID
number.
unwritten
cached
data
Sometimes called unflushed data. See dirty data.
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. Required for
Ultra-SCSI connections.
virtual terminal A software path from an operator terminal on the host to the
controller's CLI interface, sometimes called a host console. The path
can be established via the host port on the controller or via the
maintenance port through an intermediary host.
VTDPY An abbreviation for Virtual Terminal Display Utility.