Maximum number of partially full media property on Windows

Article:HOWTO67540  |  Created: 2012-02-06  |  Updated: 2013-05-02  |  Article URL http://www.symantec.com/docs/HOWTO67540
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Maximum number of partially full media property on Windows

The following option does not apply to the None pool, catalog backup pools, or scratch volume pools.

Specifies the number of partially full media to allow in the volume pool for each of the unique combinations of the following in that pool:

  • Robot

  • Drive type

  • Retention level

The default value is zero, which does not limit the number of full media that are allowed in the pool.

NetBackup writes data only to the number of partially full media with a given combination of attributes in the volume pool. When the number of partially full media is reached for a given combination of attributes, NetBackup queues backup jobs until media becomes available. If a volume becomes full, NetBackup assigns another volume for use if one is available in the pool or in a scratch pool.

When the number of partially full media is reached, NetBackup queues backup jobs until media becomes available. If a media becomes full, NetBackup assigns another media for use if one is available in the pool or in a scratch pool.

The total number of partially full media in the pool may be more than the value you specify. For example, if the value is 10, each of the following can have 10 partially full volumes in the same volume pool:

  • Robot TLD(0), 1/2" cartridge (HCART) drive type, 1/2" cartridge tape media type, and two-week retention level.

  • Robot TLD(0), 1/2" cartridge (HCART) drive type, 1/2" cartridge tape media type, and four-week retention level.

  • Robot TLD(0), 1/2" cartridge (HCART2) drive type, 1/2" cartridge tape 2 media type, and two-week retention level.

  • Robot TLD(1), 1/2" cartridge (HCART) drive type, 1/2" cartridge tape media type, and two-week retention level.

  • And so on.

A partially full volume that has multiple retention levels can count toward more than one combination of attributes. (That is, if all of the other attributes are the same.) For example, a volume that has both two week and four week retention levels counts toward the first two examples in the previous list. (Again, if all of the other attributes are the same.)

Frozen, suspended, and imported media do not count against Maximum number of partially full media. Therefore, if you unfreeze or unsuspend the media that are partially full, media may exceed the Maximum number of partially full media value. Also, if you lower the Maximum number of partially full media value, media may exceed the limit. If media exceed the Maximum number of partially full media value, NetBackup uses all of the partially full media until the limit is reached.

This option lets you maximize the media usage. NetBackup writes data to the media until they are full, and assigns other media to which it writes data until they are full.

See About server groups on Windows


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