You can enable deduplication and compression by editing configuration parameters on an existing vSAN cluster.

Prerequisites

Create a vSAN cluster.

Procedure

  1. Navigate to the vSAN host cluster in the vSphere Web Client.
  2. Click the Configure tab.
  3. Under vSAN, select General.
  4. In the vSAN is turned ON pane, click the Edit button.
  5. Configure deduplication and compression.
    1. Set deduplication and compression to Enabled.
    2. (Optional) : Enable reduced redundancy for your VMs.
    3. Click OK to save your configuration changes.

Results

While enabling deduplication and compression, vSAN changes disk format on each disk group of the cluster. To accomplish this change, vSAN evacuates data from the disk group, removes the disk group, and recreates it with a new format that supports deduplication and compression.

The enablement operation does not require virtual machine migration or DRS. 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.