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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.
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.
DR OS not only hosts the Data Protector disaster recovery
process but is also a part of the restored system because it
replaces its own configuration data with the original
configuration data.
drive A physical unit that receives data from a computer system and
can write it onto a magnetic medium (typically a tape drive). It
Glossary360