Verify that a host cluster meets the requirements for enabling vSAN.
All capacity devices, drivers, and firmware versions in your vSAN configuration must be certified and listed in the vSAN section of the VMware Compatibility Guide.
A vSAN cluster must contain a minimum of three hosts that contribute capacity to the cluster. For information about the considerations for a three-host cluster, see Design Considerations for a vSAN Cluster.
A host that resides in a vSAN cluster must not participate in other clusters.