Understanding Retention Cycles

Last post 03-09-2020, 10:54 AM by Eomall. 2 replies.
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  • Understanding Retention Cycles
    Posted: 02-25-2020, 5:38 AM

    Hi,

    Im trying to understand how the retention days and cycles work.  Been reading a bit online but cant seem to get my head around it.

    Currently we have it set to 45 days and 2 cycles.  Our last full backup of the month goes to tape.

    As we are getting it tight for space on the MA i am looking to reduce the retention if possible.  We should be fine as long as we have a month on disk and last full backup to tape.

    Suppose my question is how does the cycles work and why would it be set to 2 cycles?

    Thanks

  • Re: Understanding Retention Cycles
    Posted: 02-25-2020, 6:55 AM

    Days and cycles are independent. Data will be retained after both days and cycles expired. One cycle = full + incrementals until next full. 

     

    Have a look on this spreadsheet https://documentation.commvault.com/commvault/v11/article?p=11918.htm#o11921 . You can simulate retention there. 

  • Re: Understanding Retention Cycles
    Posted: 03-09-2020, 10:54 AM

    The cycle is going to be the full and the following incrementals, the cycle closes once the next full runs.

    We have done things like make sure the aux copies on secondary storage are caught up , then reduce retention and cycles on the expensive primary storage until more can be bought.  At least we have that second copy of the data.

    There is a spread sheet from Commvault that you can use to visually see the affects of retention and cycles.

    http://documentation.commvault.com/commvault/v11/article?p=11918.htm#o11921

     

    http://documentation.commvault.com/commvault/v11/others/features/data_aging/retention_days_cycles.xls

     

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