Introduction
In a VMware vSAN Stretched Cluster, data is mirrored between two main sites (Preferred and Secondary). To prevent a "split-brain" scenario during network partitions, vSAN requires a third site: the Witness. The vSAN Witness Appliance is a pre-configured virtual machine (VM) that acts as the tie-breaker, deciding which site retains ownership of the shared storage.
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. download vsan witness appliance
If you have vSphere 7.0 Update 1 or newer, you can download the Witness Appliance directly without visiting the Customer Connect portal:
| Problem | Solution | |---------|----------| | "Access Denied" on Customer Connect | Your account lacks a valid vSAN Stretched Cluster license. Contact your VMware reseller or account manager. | | Wrong version downloaded | Always expand the exact vSAN version you are running. Do not assume the latest version is backward compatible. | | Download slow or failing | Use a download manager. Alternatively, use the "Download via Backup URL" option provided on the product page. | Introduction In a VMware vSAN Stretched Cluster, data
On the same page, download the checksum file (.mf or .sha256).
Use sha256sum (Linux/Mac) or Get-FileHash (PowerShell) to validate the OVA.
Installing a vSAN 7.0 Witness on a vSAN 8.0 cluster will cause the cluster configuration to fail. The Witness will show as “incompatible” in the vSphere Client. If you have vSphere 7
Now that the Witness is a standalone host in your vCenter inventory, you must assign it to your vSAN cluster.
vCenter will now configure the cluster logic. The Witness host will move from being a generic host in your inventory to being "owned" by the Stretched Cluster configuration.