Unlike a full ESXi host, the Witness Appliance consumes minimal resources (1 vCPU, 2 GB RAM) and runs a lightweight version of ESXi within a VM. This article provides a clear, professional guide to locating and downloading the correct version of the appliance.
Before downloading, ensure you have the following: download vsan witness appliance
The Witness Appliance must not reside on the vSAN cluster it is protecting. It should live on a separate standalone host or a different vSphere cluster. Unlike a full ESXi host, the Witness Appliance