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G-14
Glossary
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 can also read the data from the
medium and send it to the computer
system.
drive index
A number that identifies the mechanical
position of a drive inside a library
device. This number is used by the
robotic control to access a drive.
dynamic client
See client backup with disk discovery.
EMC Symmetrix Agent (SYMA)
(EMC Symmetrix specific term)
See Symmetrix Agent (SYMA)