When you create a VMFS6 datastore, you can modify the default parameters for automatic space reclamation, granularity and priority, or disable space reclamation for your VMFS6 datastore.

Procedure

  1. In the vSphere Web Client navigator, select Global Inventory Lists > Datastores.
  2. Click the New Datastore icon.
  3. Follow the steps required to create a VMFS6 datastore.
  4. On the Partition configuration page, specify the space reclamation parameters.

    The parameters define granularity and the rate at which space reclamation operations are performed. You can also use this page to disable space reclamation for the datastore.

    Option

    Description

    Block size

    The block size on a VMFS datastore defines the maximum file size and the amount of space the file occupies. VMFS6 supports the block size of 1 MB.

    Space reclamation granularity

    Specify granularity for the unmap operation. Unmap granularity equals the block size, which is 1 MB.

    Storage sectors of the size smaller than 1 MB are not reclaimed.

    Space reclamation priority

    Select one of the following options.

    • Low (default). Process the unmap operations at a low rate.

    • None. Select this option if you want to disable the space reclamation operations for the datastore.

  5. Complete the datastore creation.

Results

After you enable space reclamation, your VMFS6 can automatically release specified blocks of unused space to the storage array.