vSAN Host Partitioned after Witness and one Host upgrade

Products

• VMware vSAN

Issue/Introduction

- 2 Node vSAN stretched cluster 
- Shared Witness Node in use
- Witness Node was upgraded first
- After upgrading the data node, Host is in partitioned state

Environment

vSAN 7.x
vSAN 8.x

Cause

This issue occurs when the Shared Witness Node is upgraded before upgrading the Data Nodes

Resolution

Upgrade the Shared Witness Node after upgrading all Data Nodes.

Additional Information

Refer https://knowledge.broadcom.com/external/article/326927/vmware-vsan-upgrade-best-practices.html

"When upgrading a stretch cluster configured with a shared witness, always upgrade the witness after all the ESXi hosts in the cluster."