Disk backup and tape overlap.

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Disk backup and tape overlap.

Veeam Logoby Burgess » Tue Sep 05, 2017 7:42 am

Hi all,

As I understand it when doing a virtual full tape backup if a forever incremental backup runs it will cause the virtual full tape backup to error and stop running.

Would this be the same for an active full backup that I am then writing to tape?

For instance, I run the active full, it creates a vbk file. This then kicks off a tape backup that starts writing the vbk to tape. Whilst this is happening an incremental disk backup happens and creates a vib based on the vbk. Will this affect the tape job that is running? I can't find any evidence to suggest that it would interfere but I thought I’d ask the question.

Cheers,

Steve.
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Re: Disk backup and tape overlap.

Veeam Logoby PTide » Tue Sep 05, 2017 9:42 am

Hi,

A primary backup job priority is always higher than backup to tape job priority thus causing the former to interrupt the latter.

For instance, I run the active full, it creates a vbk file. This then kicks off a tape backup that starts writing the vbk to tape. Whilst this is happening an incremental disk backup happens and creates a vib based on the vbk. Will this affect the tape job that is running? I can't find any evidence to suggest that it would interfere but I thought I’d ask the question.
It won't interfere if the primary backup job is not doing any transform operations (i.e. merge). Otherwise the backup to tape job will be interrupted.

Thank you
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Re: Disk backup and tape overlap.

Veeam Logoby Burgess » Tue Sep 05, 2017 9:47 am

Brilliant, thanks for the reply!

Cheers,

Steve.
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Re: Disk backup and tape overlap.

Veeam Logoby lyapkost » Tue Sep 05, 2017 9:50 am 1 person likes this post

Hi Steve.

if a forever incremental backup runs it will cause the virtual full tape backup to error and stop running
Only when old full backup is merged with the following increment at the end of source job.

In general, tape job won't be stopped unless source job modifies (transform, deleting according retention policy etc) backup files which are currently written or planned to be written to tape by already started tape job. Even in this case if 'Prevent this job from being interrupted...' checkbox is checked the tape job won't be stopped, source transform operations will wait.

So in your case incremental disk backup doesn't affect tape job at all because it doesn't modify the pre-created active full backup.
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Re: Disk backup and tape overlap.

Veeam Logoby Burgess » Tue Sep 05, 2017 10:19 am

Hi Lyapkost,

Ahh, OK. I'd read this page about virtual full backups (https://bp.veeam.expert/resource_planni ... rt-VF.html) that seems to specify at the bottom that once the primary job starts it will stop the tape job. It sounds like this is only the case when an increment is merged, however.

Another quick question then. If I have a virtual full backup running but want to run another forever incremental, can I increase the retention points for the forever incremental so that it does not merge anything back into the full backup and therefore doesn't stop the job from running?

Cheers,

Steve.
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Re: Disk backup and tape overlap.

Veeam Logoby lyapkost » Tue Sep 05, 2017 11:22 am

can I increase the retention points for the forever incremental so that it does not merge anything back into the full backup and therefore doesn't stop the job from running?
Yes, that will work but you cannot increase it infinitely though. Some customers used in the tape job a pre-job script which increased retention and a post-job script which decreased retention back to achieve this. But since 'Prevent from being interrupted...' checkbox is available it's recommended to use it instead of such tricks.
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Re: Disk backup and tape overlap.

Veeam Logoby Burgess » Tue Sep 05, 2017 11:56 am

OK, fantastic, thanks for all the help!

Cheers,

Steve.
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