[Users] Cluster, hosts, everything down and totally stuck

My cluster is totally down and I'm completely stuck. I cannot set a host in maintenance, stop a VM because it has a unknown state, so also the host where this one is on. A new added node cannot find the storage because all are down but the NFS is up. On the node that is "unknown" all interfaces are up, on the new added host all are down following ovirt, but are actually up. Because of this I'm stuck between 2 or 4 walls and I'm not able to fix this in some way. What are my options ? I'm thinking of setting the VM that is stuck on my existing host to off by editing the DB of ovirt. I hope we can sort this out. Cheers, Matt