ESXi Upgrade Fails with "ESXi Cluster Is Not Healthy" Error.

Products

• VMware SDDC Manager / VCF Installer
• VMware Cloud Foundation

Issue/Introduction

• When attempting an ESXi upgrade, you may encounter a failure due to "ESXi cluster is not healthy" errors, despite all prechecks passing during the planning phase.
• This issue typically occurs when there are active "vSphere HA failover" alerts in vCenter.
• Error in SDDC Manager UI:

  “The ESXi cluster is not healthy (green) due to : vSphere HA failover operation in progress in cluster [Cluster Name] in datacenter [Datacenter Name]: [VMCount] VMs being restarted, [VMCount] VMs waiting for a retry, [VMCount] VMs waiting for resources, [VMCount] inaccessible vSAN VMs

Environment

• VMware Cloud Foundation
• VMware SDDC Manager

 

Cause

These alerts often occur when a host fails, and vSphere HA attempts to restart a VM that was already powered off.

Resolution

​​To resolve this issue:

1. Re-configure vSphere HA to clear the alerts.
2. Refer to HA Alert : " vSphere HA failover operation in progress in cluster Cluster-x in datacenter " for detailed instructions on resolving vSphere HA alerts.
3. Once alerts are cleared, retry the ESXi upgrade.