I think this tip will help you to understand the difference between these statuses..
* Non-operational:
It means there is something wrong with the configuration of the hypervisor. The ovirt-engine can still communicate with the hypervisor though.
It can be a failure in the connectivity of hypervisor to any of the cluster’s ( ex: logical network, storage domain..etc ) components. So check hypervisor is capable of working with all the components defined for a cluster.
* Non-responsive:
means that the Ovirt Engine cannot communicate with the hypervisor via vdsm.
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