In this option, the three fault domains are at the same location; the vCenter Server, vSAN Witness appliance, and the VxRail nodes. An additional ESXi host is required to host vSAN Witness appliance and customer-supplied vCenter Server. vSAN Witness appliance, and customer-supplied vCenter cannot be hosted in the VxRail vSAN 2-node cluster.
Figure 10. Localized vCenter and Witness Appliance