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G-12
Glossary
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.
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.
DMZ
The Demilitarized Zone (DMZ) is a
network inserted as a "neutral zone"
between a company's private network
(intranet) and the outside public network
(Internet). It prevents outside users from
getting direct access to company servers
in the intranet.
DNS server
In the DNS client-server model, this is
the server containing information about
a portion of the DNS database that
makes computer names available to
client resolvers querying for name
resolution across the Internet.
domain controller
A server in a network that is responsible
for user security and verifying
passwords within a group of other
servers.
DR image
Data required for temporary disaster
recovery operating system (DR OS)
installation and configuration.
DR OS
A disaster recovery operating system is
an operating system environment in
which disaster recovery runs. It provides
Data Protector a basic runtime
environment (disk, network, tape, and
filesystem access). The OS has to be
installed and configured before the Data
Protector disaster recovery can be
performed. The DR OS can be either
temporary or active. A temporary DR
OS is used exclusively as a host
environment for some other operating