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SBE12 - Infinite - Allow append

Created: 12 Aug 2012 • Updated: 13 Aug 2012 | 8 comments
This issue has been solved. See solution.

Hi!
I could use some advice.

I backup a phisical machine every week a Sunday.
This full backup is associate a media sets name: VCENTER - FULL.

One full backup is 35gb and the tape is LTO4 - 800gb.
I want to maintain this backup for 2 weeks, then i set overwrite protection period 2 weeks.

My problem is Append period (now set 6 days ), the full backup is very little and setting a appen period 6 days, there is a waste of space!
Expired six day , SBE take another tape ! but wrote very little.
This is a situation:

In this case , i can set Append Period: INFINITE - ALLOW APPEND ?
is the best thing to do? to avoid waste of tape!?

Thanks!

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Backup_Exec's picture

Hi
In this case , i can set Append Period: INFINITE - ALLOW APPEND ?

Ans:

End of last append is the time when overwrite protection is applied on tape,so if you set infinite append that means after the tspe is overwritten first time ,it will keep on appending until tape is completely filled.
So yes you can use infinite allow append to use tape to it full capacity.

Thanks

Sameer

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crocs's picture

Ok thanks!

When the tape is full , the SBE restarts from the beginning ( same tape ) ? overwriting data expired ( overwrite protection period - expired ) ?.

Backup_Exec's picture

Hi

Backup exec would have it own way of managing the tapes. Yes once tape is overwritable it will start writing the tape from first.

Thanks

Sameer

Don't forget to give a "Thumbs Up" or Mark as "Solution" if someones advice has helped you.

Kiran Bandi's picture

overwriting data expired ( overwrite protection period - expired ) ?.

A tape is expired means all the backup images on that media are expired. Data on the tape will be overwritten completely once the tape becomes overwritable. (You can think of it as erasing the tape completely and writing the new data. )

That is why OPP of the media will be recalculated everytime data gets append to it.

crocs's picture

Thanks Kiran!

humm ... then when the tape is full, certainly the sbe take another tape ( minimum two for media sets - VCENTER - FULL.).

In my case , How would you do?

Set Infinite- allow append ?

Kiran Bandi's picture

 then when the tape is full, certainly the sbe take another tape

Yes, definately. And the tape will be kept away from backup operation for 6 days from the day it became FULL (As you configured 6 days OPP). 

Set Infinite- allow append ?

Yes, you can set it to infinite append. I do not see/didn't faced any problems with that setting while using tapes.

SOLUTION
pkh's picture

Since the size of your backups are so small, have you considered using disk, instead of tape.  The advantage of using disk is that you do not need to stage the backup to disk during a GRT restore.  This makes a GRT restore from disk a lot faster than from tape.

crocs's picture
thanks for the advice, but unfortunately I have the available storage.