Update of Witness node shows "Unsupported CPU" when attached with Baseline image

Products

• VMware vSAN

Issue/Introduction

Symptoms:

• In a ROBO cluster running on 7.0 U3,  upgrading Witness node (ahead of data nodes) to 8.0 U3 using VUM fails.
  
  
• In VUM, attaching baseline to the Witness node shows as 'incompatible' as it reports  "Unsupported CPU".
  
  
  
  

Environment

vSphere vSAN 8.x

vSphere vSAN 9.x

Cause

This is a known issue wherein if vSAN Witness node is deployed using OVF then upgrade using VUM cannot be performed.

Resolution

1. Deploy a new Witness appliance with 8.0 U3 version using OVF.
   
   (Go to Broadcom Support portal > Login with your Broadcom ID > My Downloads > VMware vSphere ESXi > Click on vSphere 8 version > Go to 'Drivers and Tools' > Click on VMware vSAN Witness Appliance and Download the OVF)
   
   
2. Change the old witness node with newly created Witness.
   
   (Navigate to vSAN Cluster in vSphere Client > Configure > Fault Domains > Click on 'Change Witness node'.)