Hi Jan! Thanks for your answer.
>> I have a Proxmox cluster which uses Corosync as cluster engine. >> Corosync uses the "default" multicast configuration. Nevertheless, >> using tcpdump I see much more packets sent by corosync using unicast >> between the node members than multicast packets. >> >> Is this normal behavior? If yes, please point me to some documentation. > > It really depends. If cluster is quiet (no configuration changes) so it > basically only heartbeats then it's pretty normal that unicast trafic > (used for heartbeats) is bigger than multicast one. Now I am confused. I thought that corosync uses totem and the totem protocol has implicit keep-alive by passing the token between the ring members. So, even if there are no messages, the token is passed on in the ring giving implicit keep-alive. And all this is done using multicast. So, is my understanding wrong and corosync uses totem only for message delivery and there is an additonal "heartbeat" feature which sends unicast keep-alive to all the known members? Thanks Klaus _______________________________________________ Users mailing list: Users@clusterlabs.org https://lists.clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org