After you enable Virtual SAN on a cluster, you must assign the cluster an appropriate Virtual SAN license.
Just like vSphere licenses, Virtual SAN licenses have per CPU capacity. When you assign a Virtual SAN license to a cluster, the amount of license capacity that is used equals the total number of CPUs in the hosts that participate in the cluster. For example, if you have a Virtual SAN cluster that contains 4 hosts with 8 CPUs each, you need to assign the cluster a Virtual SAN license with a minimum capacity of 32 CPUs.
The license usage of the Virtual SAN cluster is recalculated and updated in one of the following cases:
If you assign a new license to the Virtual SAN cluster.
If you add a new host to the Virtual SAN cluster.
If a host is removed from the cluster.
If the total number of CPUs in a cluster changes.
You must maintain the Virtual SAN clusters in compliance with the Virtual SAN licensing model. The total number of CPUs of all hosts in the cluster must not exceed the capacity of the Virtual SAN license that is assigned to the cluster.
License and Evaluation Period Expiry
When the license or the evaluation period of a Virtual SAN expires, you can continue to use the currently configured Virtual SAN resources and features. However, you cannot add SSD or HDD capacity to an existing disk group or create new disk groups.
Virtual SAN for Desktop
Virtual SAN for Desktop is intended for use in VDI environments, such as vSphere for Desktop or Horizon™ View™. The license usage for Virtual SAN for Desktop equals the total number of powered on VMs in a cluster with enabled Virtual SAN.
To remain EULA compliant, the license usage for Virtual SAN for Desktop must not exceed the license capacity. The number of powered on desktop VMs in a Virtual SAN cluster must be less than or equal to the license capacity of Virtual SAN for Desktop.