The primary building block for compute resources for Cloud Foundation on VxRail is the server node. VxRail leverages the Dell PowerEdge server products as the foundation for a cluster. A VxRail cluster can start with as few as three nodes and can scale to a maximum of 64 nodes. The first VxRail cluster deployed is always used to support the management workload domain, which requires a minimum of four nodes. VxRail supports a wide variety of server physical configurations, with flexibility on CPU model, CPU quantity and speed, RAM capacity, physical storage capacity, and network port quantity and speed.
For more details, refer to: VxRail 14G Series Specification Sheet
The mixing of different server configurations in a single cluster is supported because VxRail views the individual server node as a static pool of compute resources. This offers additional flexibility to start the initial configuration to meet a pre-defined baseline, and adapt and expand as necessary for changing workload requirements.