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Procedure
This is an online operation and does not require virtual machine migration or DRS. The time
required for this operation depends on the number of hosts in the cluster and the amount of
data. You can monitor the progress on the Tasks and Events tab. If the system uses
deduplication and compression, the best practice is to enable it at the time the system is initially
set up.
1. Navigate to the Virtual SAN host cluster in the vSphere Web Client. Click the Configure tab.
2. Under vSAN, select General .
3. In the vSAN is turned ON pane, click the Edit button.
4. Configure deduplication and compression.
The figure below shows the vSAN setting for enabling compression.
Figure 21. Deduplication and compression enabled
5. Set deduplication and compression to Enabled .
6. Click OK to save your configuration changes.
When deduplication and compression is enabled, vSAN changes disk format on each disk
group in 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 best practice is to enable deduplication and compression immediately after
the system is initialized. If it is enabled on a production system, it is recommended that this be
done during periods of low activity to minimize potential performance impact.