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Volume Migration - Volume Size

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  • 1.  Volume Migration - Volume Size

    Posted 03-12-2023 11:34

    Hello, 

    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 ? 

    regards
    Sven



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    Sven Kirsten
    Systems Engineer
    SVA System Vertrieb Alexander GmbH
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  • 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: 

    https://knowledge.hitachivantara.com/Documents/Management_Software/Ops_Center/API_Configuration_Manager/10.2.x/REST_API_Reference_Guide/Volume_allocation/12_Reclaiming_zero_pages_of_a_DP_volume

    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. 



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    William Jansen van Nieuwenhuizen
    Hitachi Vantara
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