SDDC upgrade precheck fails during ESXi host checks with error message VM faults in EMM dry run

Products

• VMware SDDC Manager

Issue/Introduction

• SDDC upgrade precheck fails during ESXi host checks with error message
  
  VM faults in EMM dry run


• Remediation of the error shows
  
  This operation would violate a virtual machine affinity/anti-affinity rule


• Hosts can be manually placed into maintenance mode sequentially from vCenter by selecting the "Ensure Accessibility" option.
• In the Summary tab of the affected ESXi host, the following error is seen:
  
  vSphere HA reports that an agent is in the Agent Unreachable state

Environment

VMware SDDC Manager 5.x

Cause

vSphere HA agent failures on specific hosts prevent VM migration to those hosts. When other hosts enter maintenance mode, VMs may breach host affinity rules (e.g., VMs must reside on separate hosts).

Resolution

Right-click the affected host and click Reconfigure for vSphere HA.