Solution 2 : Power Management test Failed \ Hypervisors becoming non-operational or in Error state

Following is method to specify host heartbeat check (by default it's 10) in RHEV Manager config:

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Check is vdsHeartbeatInSeconds.type has been specified already.

 cat /etc/ovirt-engine/engine-config/engine-config.properties |grep vdsHeartbeatInSeconds.type

Add if  it doesn't exists (take a backup of engine-config.properties first):

 echo vdsHeartbeatInSeconds.type=Integer >> /etc/ovirt-engine/engine-config/engine-config.properties

If all looks good, run below command.

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engine-config -s vdsHeartbeatInSeconds=20

Check this definition via command:

engine-config -l