The unified resources of a VxRail appliance create a virtual infrastructure that is defined and managed as a vSphere cluster under a single instance of vCenter. A decision must be made to use the VxRail vCenter Server, which is deployed in the cluster, or a customer-supplied vCenter server, which is external to the cluster. During the VxRail initialization process which creates the final product, you must select whether to deploy VxRail vCenter Server on the cluster or deploy the cluster on an external customer-supplied vCenter server. Once the initialization process is complete, migrating to a new vCenter single point of management requires professional services assistance, and is difficult to change.
Multiple VxRail clusters can be configured on a single customer-supplied vCenter server, while a deployment with VxRail vCenter server is limited to a single VxRail cluster. The customer-supplied vCenter server option is more scalable, provides more configuration options, and is the recommended choice. See the Dell EMC VxRail vCenter Server Planning Guide for details.