Basic question about what "synthetic full" backups *ought* to catch

Last post 07-02-2020, 2:59 PM by solr. 3 replies.
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  • Basic question about what "synthetic full" backups *ought* to catch
    Posted: 07-02-2020, 11:55 AM

    We have a large number of servers which run incrementals every weeknight and then a synthetic full at the weekend.  Our understanding was that at the time the synthetic full runs, it should stitch together the data captured in the incrementals, plus any new data or modified data which had appeared *since the last incremental* -- essentially, running another incremental and consolidating it with the previous ones to make a full.

    But we've run into a problem where it looked like the synthetic full was consolidating previously run incrmentals, but not capturing anything that was new since the last incremental was run.

    IS that normal? Do synthetic fulls not backup data new since the last incremental?

    Found the documentation confusing, and I need to check my understanding here.

  • Re: Basic question about what "synthetic full" backups *ought* to catch
    Posted: 07-02-2020, 2:15 PM

    Hi LynB,

     

    Yes that is the behaviour of Synthetic Full's. It stitches all the data in the latest cycle. Which means last Full and all the incrementals till the point Synthetic full is run. It does not backup any new data since last incremental. This has always been like this.

    We will correct/simplify the documentation if there is any confusion.

     

    Thanks,

    Ankur

  • Re: Basic question about what "synthetic full" backups *ought* to catch
    Posted: 07-02-2020, 2:28 PM

    As it happens, since I posted this, I discovered that no, it has NOT always been this way.

    Up until SP16, there was an option to include an incremental before a synthetic full, so you could set up the synthetic fulls to include all the new data!

    https://documentation.commvault.com/commvault/v11_sp6/article?p=features/backup/syn_full_getting_started.htm

    Then, as of SP16, they quietly just....took that away. Yell

  • Re: Basic question about what "synthetic full" backups *ought* to catch
    Posted: 07-02-2020, 2:59 PM

    LynB,

             The same could be achieved by making a small change in the new schedules. Documentation Link for that. For the old schedules you should still see the option.

    http://documentation.commvault.com/commvault/v11/article?p=11720.htm#o118836

    In case if this still doesnt suffice your business requirement then please get in touch with support and they should help you with directions on to have the previous option enabled.

    Regards,

    Prasad.

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