Hi list! After upgrade my cluster from 4.1.9 to 4.2.2, agent and broker can't start on host... cat /var/log/ovirt-hosted-engine-ha/agent.log MainThread::ERROR::2018-06-21 03:25:34,603::hosted_engine::538::ovirt_hosted_engine_ha.agent.hosted_engine.HostedEngine::(_initialize_broker) Failed to start necessary monitors MainThread::ERROR::2018-06-21 03:25:34,604::agent::144::ovirt_hosted_engine_ha.agent.agent.Agent::(_run_agent) Traceback (most recent call last) cat /var/log/ovirt-hosted-engine-ha/broker.log MainThread::INFO::2018-06-21 03:25:40,406::monitor::50::ovirt_hosted_engine_ha.broker.monitor.Monitor::(_discover_submonitors) Finished loading submonitors MainThread::WARNING::2018-06-21 03:25:40,406::storage_broker::97::ovirt_hosted_engine_ha.broker.storage_broker.StorageBroker::(__init__) Can't connect vdsm storage: 'metadata_image_UUID can't be '' cat /etc/ovirt-hosted-engine/hosted-engine.conf | grep metadata_image metadata_image_UUID= Also is: cat /etc/ovirt-hosted-engine/hosted-engine.conf | grep lock lockspace_image_UUID= lockspace_volume_UUID= This bug is very much like this https://bugzilla.redhat.com/show_bug.cgi?id=1521011 My cluster started with version 3.3... But i can't resolution this bug correctly. Guru please help me!!! Thanx, Alex!