HP A.06.11 - Manual (Page 293)

Disk Agent A component needed on a client to back it up and restore it.
The Disk Agent controls reading from and writing to a disk.
During a backup session, the Disk Agent reads data from a disk
and sends 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. During an object
verification session the Disk Agent receives data from the Media
Agent and performs the verification process, but no data is
written to disk.
Disk Agent
concurrency The number of Disk Agents that are allowed to send data to one
Media Agent concurrently.
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 .
Distributed File
System (DFS) A service that connects file shares into a single namespace. The
file shares can reside on the same or on different computers.
DFS provides client access to the resources in a
location-transparent manner.
Integration guide for Oracle and SAP 293