[OpenShift Virtualisation] Machine Config Operator (MCP) is in a degraded state

Issue

• The MCP was stuck and not rolling out due to non-migratable VirtualMachines (VMs) running on the node, preventing the node drain process.

• Below messages can be seen in the Machine-Config-Controller POD:

  error when evicting pods/"virt_POD_name" -n "namespace_name" (will retry after 5s): admission webhook "virt-launcher-eviction-interceptor.kubevirt.io" denied the request: VMI vmi_name is configured with an eviction strategy but is not live-migratable
  

• It was found that these VMs had a ReadWriteOnce volume attached, making them non-live-migratable, which led to the issue.