Now that we have prepared the cluster, applied licensing, configured networking, and prepared the physical disks, we are finally ready to enable VSAN on the cluster. The hard part is done—from here, the process is very simple and we will have a functional VSAN cluster in just a few more steps!
You should be logged in to the vSphere Web Client as an administrator or user, authorized to alter cluster-level settings and VSAN.
From the vSphere Web Client, navigate to: Home | Hosts and Clusters | Datacenter | Cluster | Manage | Virtual SAN | General, and click on the Edit… button:
Check the Turn ON Virtual SAN checkbox and select your disk-claiming rules by selecting the appropriate option from the Add disks to storage drop-down menu, and then click on OK.