Dell VxRail Architecture Overview

The following requirements apply to the VMware vSAN witness host for a VxRail 2-node VMware vSAN cluster:

• VMware supports both a physical VMware ESXi host or the VMware vSAN witness appliance (VM).
• The witness appliance does not require additional licensing.
• The witness appliance must be hosted on a VMware vSphere environment.
• In VxRail 7.0.132 and later, the witness can be shared with up to 64 2-node VMware vSAN clusters.
• The witness appliance running on the VD-4000w sled cannot be shared with other 2-node clusters.
• The witness appliance running on the VD-4000w, the VD-4000w node, and the two compute nodes use a single management network.
• The witness appliance on the VD-4000w and the two compute nodes use a single witness traffic network. This allows direct connection between the compute nodes for VMware vSAN and VMware vSphere vMotion traffic where high-speed switches are not available.