A VxRail stretched cluster spans remote sites to enable protection from a single site failure and requires a witness as a cluster quorum.
Both a VxRail-supplied vCenter and a customer-supplied vCenter are supported. On VxRail cluster running versions earlier than 4.5.200, a customer-supplied vCenter Server solution is required. If possible, a customer-supplied vCenter is preferred:
Figure 10. VxRail stretched cluster overview