Hi all, I have no idea if it is ovirt related, nevertheless I give it a try. Playing around with Red Hat Clustering I created a 3 node cluster. It seems to works fine, but after changing a couple of things /var/log/messages is flooding with warnings like: Mar 13 18:13:58 node3 corosync[1560]: [TOTEM ] Retransmit List: 9b 9c 88 8a 8b 8e 8f 90 91 92 93 94 95 96 97 98 99 9a Mar 13 18:13:58 node3 corosync[1560]: [TOTEM ] Retransmit List: 9b 9c 88 8a 8b 8e 8f 90 91 92 93 94 95 96 97 98 99 9a Mar 13 18:13:58 node3 corosync[1560]: [TOTEM ] Retransmit List: 9b 9c 88 8a 8b 8e 8f 90 91 92 93 94 95 96 97 98 99 9a It seems multicast related, which all seems fine: [root@node1 ~]# netstat -g IPv6/IPv4 Group Memberships Interface RefCnt Group --------------- ------ --------------------- lo 1 all-systems.mcast.net eth0 1 239.192.7.246 eth0 1 all-systems.mcast.net eth1 1 all-systems.mcast.net Testing with omping works well. OK, I'm using home hardware, but the 3 nodes are doing virtually nothing. It's on one local network, using local storage etc. Anyone familiar with this problem? That is: after some "heavy" multicasting packages seem not to arrive. It might be an virtio network thing, ovirt...?