Turn on compression for auxiliary copy

Last post 05-01-2017, 5:34 AM by ksrajiv. 1 replies.
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  • Turn on compression for auxiliary copy
    Posted: 05-01-2017, 5:24 AM

    Hi,

     

    Probably not, but who knows.

     

    We have a customer who used a DataDomain in the past for his Primary copy.

    To have full advantage of the DD they disabled compression and did not make use of deduplication.

    Now they want to phase out these DataDomain and created auxiliary copies to move their data to a “simple” library

    One of these copies is a Selective year copy without deduplication. Our customer noticed that the data written is the same size as the application data and concludes there is no compression.

    I believe this is normal standard behavior. If you do not use compression in your primary copy you cannot enable it in an auxiliary copy.

    The only way I can think to make more efficient use of the storage is to use deduplication. As it is just for a year copy I cannot predict how efficient this will be. I think the only way to know is configure it.

     

    Has anyone another idea? Maybe an additional setting? And why should not able it in another copy. What is the reason behind this.

     

    Regards,

    Danny

  • Re: Turn on compression for auxiliary copy
    Posted: 05-01-2017, 5:34 AM

    Compression only happens on primary copy. You cannot turn on compression only for secondary copy. Commvault backup index which maintains the pointers to location of data on media is copy and media independent. i.e. a single index can find data on any copy. Hence all copies have to be of same size and cannot vary in size due to compression. During auxiliary copy we do not compress or uncompress data to maintain the size of data as known to commvault.

     

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