"A failure occurred when starting an operation on the entity 'host-###' : Failed to write lock entities host-### due to concurrent activity as part of another operation." error when trying to convert a baseline based cluster to use Image

Products

• VMware vCenter Server

Issue/Introduction

• Converting a cluster to use Image fails at the Compliance check task with error "A failure occurred when starting an operation on the entity 'host-###' : Failed to write lock entities host-### due to concurrent activity as part of another operation.".


• Under Recent Tasks on vSphere Client, the below task is listed:
  
  Note: The task can be any Lifecycle Manager task running for unknown duration.

Environment

VMware vSphere ESXi 8.x

Cause

• For any Lifecycle Manager operations, vCenter needs to acquire a write lock on the ESXi hosts involved.
• The error is caused by lingering lock state from a stuck Lifecycle Manager task on vCenter Server, which blocks new operations from acquiring host locks.

Resolution

Restart the Update Manager Server on the vCenter Server to resolve the issue:

• SSH to the vCenter Server as root -> enter shell.
• Restart the service: service-control --restart updatemgr