Glossary
This glossary defines terms used in this guide or related to this product and is not a comprehensive
glossary of computer terms.
appliance An intelligent device programmed to perform a single well-defined function.
Appliances differ from general-purpose computers in that their software is
normally customized for the function they perform, pre-loaded by a vendor,
and not alterable by the user.
automigration Data intended for tape storage is written to virtual tape and after the backups are
complete written to physical tape in the background. One virtual tape emulates
onephysicaltapetothehostsystem. Dataisheldonthevirtualtape,which
greatly improves restore times over the slow loading process of a robotic library.
The VLS will be able to perform automigration in the future.
bandwidth Also known as data transfer rate. The amount of data that can be carried from
one point to another in a given tim e period.
A real communications path usually consists of a succession of links, each with
its own bandwidth. If one of these is much slower than the rest, it is said to
be a bandwidth bottleneck.
cartridge 1) A removable storage module that contains magnetic or optical disks,
magnetic tape or memory chips.
(2) Software emulation of the behavior and contents of a physical tape cartridge
on alternate media, such as disk, is called a virtual tape or virtual media.
See also virtual tape.
chassis A metal box that houses computer hardware.
command line
interfac e (CLI)
A user interface to an application that accepts typed-in comma nds one line at a
time typically through a console screen.
data backup The activity of copying files or databases so that they will be preserved in case
of equipment failure or other catastrophe. The retrieval of filesyoubackedupis
called restoring files.
See also data restore.
data c om pression A software or hardware process that shrinks data files so that they o ccupy less
storage space, and can be transmitted faster and easier. Data is encoded so it
takes up less storage space and less bandw idth f or transmission.
See also bandwidth.
data migration The process of moving data from one storage device to another, such as
migrating data from virtual media to physical media.
data restore To recover data files stored on virtual or physical media.
data retention pe-
riod
The length of time data is retained (stored) on virtual or physical m e dia.
disk array Two or more hard drives combined as a single logical unit for increased
capacity, speed, and /or fault-tolerant operation. Disk arrays are logically
grouped into a storage pool.
See also storage pool.
HP StorageWorks
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