Video Screencast Help

Reclaim Tape Space Feature

Created: 20 Sep 2010 • Updated: 05 Nov 2010 | 4 comments
Karthikeyan Sundaram's picture
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Status: Alternative Solution

Today i got to know TSM holding a Great Feature helps to Reclaim Tape Space, NBU Should get that feature in to lead the data protection world.

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Joe Pfeiffer's picture

Are you talking about reclamation?  NBU has a reclaim tape space feature in that it can create synthetic fulls from full backups + incrementals on disk before they go to tape.  It's called synthetics or optimized synthetic (if you're using dedupe to create it).

Sr. Product Manager, NetBackup

Symantec

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Karthikeyan Sundaram's picture

I am already aware about Synthetic backup; Its regarding, Tape Space Reclaim feature helps to claim spaces from tapes and allows that to be used for other backup purpose; and this finally helps Backups to go for Efficient and Tape Save.

Thanks, Karthikeyan Sundaram.

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Joe Pfeiffer's picture

NetBackup puts backups of the same expiration on the same tape.  TSM mixes different retention levels on the same tape which is why reclamation is needed since it eventually creates "holes" of free space on that tape.  Reclamation would not benefit or save tapes since NBU is being as efficient as possible as it pertains to expiration and freeing up tape.

Sr. Product Manager, NetBackup

Symantec

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hforman's picture

It also depends on how the user sets up the amount of time a tape can be appended to.  If you make this too large, images at the beginning of the tape may expire before the images at the back of the tape.  If you make it too short, you waste tape.  It seems to be a matter of goals and tuning. 

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