Cannot change cluster compatibility mode from 3.6 to 4.0

Solution Verified - Updated -

Issue

  • After upgrading RHEV 3.6 to RHV 4.0, compat mode for cluster cannot be changed to 4.0
  • Error in engine.log shows
WARN  [org.ovirt.engine.core.bll.UpdateVmCommand] (default task-7) [198715a5] Validation of action 'UpdateVm' failed for user admin@internal. Reasons: VAR__ACTION__UPDATE,VAR__TYPE__VM,ACTION_TYPE_FAILED_DEDICATED_VDS_DOES_NOT_EXIST

Environment

  • Red Hat Virtualization 4.0
  • Upgrade from 3.6

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