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G-13
Glossary
it to the Media Agent, which then moves
it to the device. During a restore session
the Disk Agent receives data from the
Media Agent and writes it to the disk.
Disk Agent concurrency
The number of Disk Agents that are
allowed to send data to one Media
Agent concurrently.
disk discovery
The detection of disks during client
backup with disk discovery. During this
backup, Data Protector discovers
(detects) the disks that are present on the
client — even though they might not
have been present on the system when
the backup was configured — and backs
them up. This is particularly useful in
dynamic environments, where
configurations change rapidly. After the
disks are expanded, each inherits all
options from its master client object.
Even if pre- and post-exec commands
are specified once, they are started many
times, once per each object.
disk group (Veritas Volume Manager
specific term)
The basic unit of data storage in VxVM
system. A disk group can consist of one
or more physical volumes. There can be
more than one disk group on the system.
disk image (rawdisk) backup
A high-speed backup where Data
Protector backs up files as bitmap
images. A disk image (rawdisk) backup
does not track the files and directory
structure stored on the disk, but stores a
disk image structure on byte level. You
can perform a disk image backup of
either specific disk sections or a
complete disk.
disk quota
A concept to manage disk space
consumption for all or a subset of users
on a computer system. This concept is
used by several operating system
platforms.
disk staging
The process of backing up data in
several phases to improve the
performance of backups and restores,
reduce costs of storing the backed up
data, and increase the data availability
and accessibility for restore. The backup
stages consist of backing up data to one
media type first (for example disk) and
later copying it to a different media type
(for example tape).
distributed file media format
A media format, available with the file
library, which supports a space efficient
type of synthetic backup called virtual
full backup. Using this format is a
prerequisite for virtual full backup.
See also virtual full backup.