During a restore session, a Media Agent locates data on the

 

backup medium and sends it to the Disk Agent. The Disk Agent

 

then writes the data to the disk. A Media Agent also manages

 

the robotics control of a library.

media allocation

Determines in which sequence media are used for backup. The

policy

Strict allocation policy directs Data Protector to prompt for a

 

specific medium. The Loose policy directs Data Protector to

 

prompt for any suitable medium. The Formatted First policy

 

directs Data Protector to give preference to unknown media,

 

even if unprotected media are available in the library.

media condition

The quality of a medium as derived from the media condition

 

factors. Heavy usage and age result in an increased number of

 

read and write errors with tape media. Media need to be

 

replaced when they are marked as POOR.

media condition

The user-assigned age threshold and overwrite threshold used

factors

to determine the state of a medium.

medium ID

A unique identifier assigned to a medium by Data Protector.

media label

A user-defined identifier used to describe a medium.

media location

A user-defined physical location of a medium, such as "building

 

4" or "off-site storage".

media

A session performing some action on a medium, such as

management

initializing, scanning the content, verifying data on a medium,

session

or copying a medium.

media pool

A set of media of the same type (such as DDS) used and tracked

 

as a group. Media are formatted and assigned to a media pool.

media set

The result of a backup session is data backed up on a group of

 

media called media set. Depending on the media usage policy,

 

several sessions can share the same media.

media type

The physical type of media, such as DDS or DLT.

media usage

The media usage policy controls how new backups are added

policy

to the already used media. It can be Appendable,

 

Non-Appendable, or Appendable for incrementals

 

only.

Concepts guide

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