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Volume Migration - Volume Size

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  • 1.  Volume Migration - Volume Size

    Posted 03-12-2023 11:34


    last, I used "Volume Migration" in OpsCenter to migrate an ESX - Boot Volume from an older VSP to this newer one.
    It works - but I saw the used capacity before and after. 

    In this exmaple, I migrated a volume with size of 10 GB and 60% used capacity. 

    After the OpsCenter "Volume Migration" was finished, the volume size was also 10 GB but, 100% used capacity. 

    Is this a normal expected behavior ? 

    Is there a way to use zero page reclaim ? 


    Sven Kirsten
    Systems Engineer
    SVA System Vertrieb Alexander GmbH

  • 2.  RE: Volume Migration - Volume Size

    Posted 03-12-2023 14:39

    Hello Sven

    Yes it's expected. The Migration copies the 0 blocks as well. A ZPR will clean up the consecutive 0 pages. Might be good to check that HMO 114 is set to enable Asyncronous Page Reclamation with ESXi hosts using Vmware 6.5 and higher. 

    I find triggering ZPR from CMRest is the easiest:

    Just be sure to delete the migration job after it's done, before you kick it off the ZPR else you might get an error as explained on the KB. 

    William Jansen van Nieuwenhuizen
    Hitachi Vantara