Changing cluster compatibility to 3.6 fails with error "Some of the hosts still use legacy protocol which is not supported by cluster 3.6 or higher"

Solution Verified - Updated -

Issue

  • Changing cluster compatibility from 3.5 to 3.6 fails with below error Some of the hosts still use legacy protocol which is not supported by cluster 3.6 or higher
  • Engine log shows below messages
'UpdateVdsGroup' failed for user admin@internal. Reasons: VAR__TYPE__CLUSTER,VAR__ACTION__UPDATE,ACTION_TYPE_FAILED_WRONG_PROTOCOL_FOR_CLUSTER_VERSION"
  • Hypervisors are already upgraded to latest version

Environment

  • Red Hat Enterprise Virtualization 3.6

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