Leveraging vSAN for Highly Available Management Clusters : Use Case Architecture : 4.4 Architecture Prerequisites and Constraints
   
4.4 Architecture Prerequisites and Constraints
The following table lists the basic prerequisites for the architectural example: software versions, configurations, and operations.
Table 4. Architecture Prerequisites Summary
Area
Specific requirement
VMware vSAN
Version 6.1 or later (to support 2 nodes and a witness host)
Witness Host
Network connectivity from the witness host to the vSAN network
Witness Host
Dedicated deployment, one for each vSAN cluster
Witness Host
Must run same vSphere version as the cluster data nodes
ESXi Supporting Witness Host Appliance
Must run vSphere v.5.5 or later
Witness Host Appliance
Must not reside on the same vSAN cluster resources