Why is changing the RHEV Cluster compatibility version from 3.x to 3.y version failing?

Solution Verified - Updated -

Issue

  • Why is changing the RHEV Cluster compatibility version from 3.x to 3.y version failing?
  • The attempt if failing with the following error:
Error while excuting action: Cannot change Cluster Compatibility Version to higher version when there are active Hosts with lower version.
-Please move Hosts with lower version to maintenance first

Environment

  • Red Hat Enterprise Virtualization 3.1, 3.2, 3.3, 3.4, 3.5, 3.6
  • Red Hat Enterprise Virtualization Hypervisor 6.x
  • Red Hat Enterprise Virtualization Hypervisor 7.x

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