| 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 | A media format, available with the file library, which supports |
media format | 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 | A service that connects file shares into a single namespace. The |
System (DFS) | file shares can reside on the same or on different computers. |
| DFS provides client access to the resources in a |
| |
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 |
| 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 |
360Glossary