Virtual Synthetic Fulls by Dell EMC Data Domain Commvault support

Last post 06-09-2019, 8:44 PM by Wwong. 4 replies.
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  • Virtual Synthetic Fulls by Dell EMC Data Domain Commvault support
    Posted: 05-28-2019, 10:52 PM
    • Egg is not online. Last active: 10-19-2019, 11:01 AM Egg
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    Hi, Does anyone knows if Commvault Version 11 SP13+ supports Virtual Synthetic Fulls by Dell EMC Data Domain?

    My DD Boost is ddboostfs-1.2.0.1-595646.

    DD OS: 6.1.1 and DD model is DD6800.



    Braga, Eduardo
    Backup Administrator
  • Re: Virtual Synthetic Fulls by Dell EMC Data Domain Commvault support
    Posted: 06-03-2019, 9:57 AM
    • Aplynx is not online. Last active: 10-22-2019, 5:20 PM Liam
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    Can you expand on the scenario? I'm not sure what you are asking. 

  • Re: Virtual Synthetic Fulls by Dell EMC Data Domain Commvault support
    Posted: 06-03-2019, 12:56 PM
    • Egg is not online. Last active: 10-19-2019, 11:01 AM Egg
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    Aplynx,

    Sorry. My question was incomplete, because I didn't want to mention documentation from other vendor's tools. Now, I think that It would be appropriate. 

    "The difference is simple, but profound. In a traditional synthetic full, the NetWorker server (or storage node) is doing all the grunt work. It’s reading all the data up into itself, combining it appropriately and writing it back down. If you’ve got a 1TB full backup and 6 incremental backups, it’s having do read all that data – 1TB or more, up from disk storage, process it, and write another ~1TB backup back down to disk. With a virtual synthetic full, the Data Domain is doing all the heavy lifting. It’s being told what it needs to do, but it’s doing the reading and processing, and doing it more efficiently than a traditional data read."

    Basics – What’s a virtual synthetic full?
    https://nsrd.info/blog/2018/01/26/basics-whats-a-virtual-synthetic-full/

     

    "That’s where NetWorker 8.1 and virtual synthetic fulls come into play. In this scenario, NetWorker instructs the Data Domain to create a new full backup via Boost. For the Data Domain, this consists of giving NetWorker back the appropriate reference data for the saveset after (mostly) jiggling pointers and updating its own back-end file data. The net result is speed. Virtual synthetic fulls are fast on Data Domain because there’s very little data being rehydrated – deduplicated data is just being adjusted."

     

    Virtual synthetic fulls: A match made in heaven

     

    http://nsrd.info/blog/2013/10/30/virtual-synthetic-fulls-a-match-made-in-heaven/

     

     

    "Virtual synthetic Backups reduce the processing overhead associated with traditional synthethic full backups."

    https://www.emc.com/collateral/white-papers/h11755-business-value-dd-boost-wp.pdf

     

     

     



    Braga, Eduardo
    Backup Administrator
  • Re: Virtual Synthetic Fulls by Dell EMC Data Domain Commvault support
    Posted: 06-04-2019, 4:02 AM

    I believe that Commvault won't support offloading the Synthetic Full workload onto the Data Domain because of how Commvault stores indexing metadata with each job.  For this reason (and poor Data Domain rehydration performance) are not as popular with Commvault as other backup vendors.

  • Re: Virtual Synthetic Fulls by Dell EMC Data Domain Commvault support
    Posted: 06-09-2019, 8:44 PM

    Hi Eduardo

    The use of "Virtual Synthetic Fulls by Dell EMC Data Domain", really depends on how the Commvault infrastructure is setup.

    Scenario:

    • If you using are using Commvault Deduplication - http://documentation.commvault.com/commvault/v11/article?p=25923.htm
      • A synthetic full backup is a synthesized backup, created from the most recent full backup and subsequent incremental and/or differential backups. The resulting synthetic full backup is identical to a full backup for the subclient.

      • Unlike full, incremental, and differential backups, a synthetic full backup does not actually transfer data from a client computer to the backup media. Therefore, they do not use any resources on the client computer.

    • If you are using Data Domain (Deduped) - you can refer to the following documentation to enable DD Boost http://documentation.commvault.com/commvault/v11/article?p=9404.htm#o105731
     
    By design, CommVault Synthetic Full works on the same manner, where it will read backup data from one media and simultaneously write (restore) the result to the new active media within the same media group. 
     
    Hopefully that helps 
     
    Regards
     
    Winston 
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