You can disable deduplication and compression on your Virtual SAN cluster. 

When deduplication and compression are disabled on the Virtual SAN cluster, the size of the used capacity in the cluster can expand (based on the deduplication ratio). Before you disable deduplication and compression, verify that the cluster has enough capacity to handle the size of the expanded data.

  1. Navigate to the Virtual SAN host cluster in the vSphere Web Client.
  2. Click the Configure tab.
  3. Under Virtual SAN, select General.
  4. In the Virtual SAN is turned ON pane, click the Edit button.
  5. Disable deduplication and compression.
    1. Set the disk claiming mode to Manual.
    2. Set deduplication and compression to Disabled.
    3. Click OK to save your configuration changes.

While disabling deduplication and compression, Virtual SAN changes disk format on each disk group of the cluster. To accomplish this change, Virtual SAN evacuates data from the disk group, removes the disk group, and recreates it with a format that does not supports deduplication and compression.

The time required for this operation depends on the number of hosts in the cluster and amount of data. You can monitor the progress on the Tasks and Events tab.

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