Do not Deduplicate against objects older than...

Last post 07-11-2018, 6:40 PM by Wwong. 1 replies.
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  • Do not Deduplicate against objects older than...
    Posted: 07-11-2018, 11:13 AM

    Hello,

     

    I have a question about the Deduplicate against objects older than n day(s) setting under the deduplication policy settings.

     

    http://documentation.commvault.com/commvault/v11/article?p=93891.htm#o59058

     

    When this value is set for 90 days, my assumption is every 90 days that block of data will be rewritten to the backend storage and new deduplication signature is written in the DDB.  What happens to the old block of data and the old DDB signature?

     

    Thanks,

    John

  • Re: Do not Deduplicate against objects older than...
    Posted: 07-11-2018, 6:40 PM

    Hi John 

    In relation to the setting "Deduplicate against objects older than n day(s)", the purpose is that new data will be re-baseline and new signature will be written to the backend storage, rather then using the existing signature. 

    Old Signature will follow the retention rules that is set, and will age out naturally once the associated Backup Job(s) has met aging retention.

    So in short old DDB signature in the DDB and Disk Library will age out on an on-going basis (assuming infinite retention is not set).

    Also when using this feature, it is acknowledged that additional Storage Capacity will be consumed, as new signature will consume space, while the old signature will need to meet retention before aging out. 

    Hopefully that helps

    Thank you 

    Winston

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