You can configure the disk space reclamation feature for linked-clone desktop pools, instant-clone desktop pools, and automated farms that use vSAN datastores.

Procedure

  1. Check that the UNMAP feature is enabled in the ESXi host.
    Run the following commands from the command line: 
    esxcfg-advcfg -g /VSAN/GuestUnmap

    The value of the "GuestUnmap" option is 0. 

    esxcfg-advcfg -g /VSAN/Unmap

    The value of the "Unmap" option is 1.

  2. Enable guest UNMAP in all ESXi hosts.
    Run the following command: 
    esxcfg-advcfg -s 1 /VSAN/GuestUnmap

    Then, check the UNMAP feature for the guest operating system. Run the following command: 

    esxcfg-advcfg -g /VSAN/GuestUnmap
    The value of the GuestUnmap option is 1.
  3. Enable the UNMAP feature in vCenter Server.
    Run the following RVC command: 
    vsan.unmap_support <cluster> -e