On Tue, Jan 25, 2011 at 8:15 AM, Alain.Moulle <alain.mou...@bull.net> wrote: > Hi > > A bunch of thoughts/questions about heartbeat network(s) : > > In the following, when I talk about "two heartbeat networks" , I'm > talking about two physically different networks set in the corosync.conf > as two different ring-number (with rrp_mode set to "active"). > > 1/ with a 2-nodes HA cluster, it is recommended to have two heartbeat > networks > to avoid the race for fencing, or even the dual-fencing in case of > problem on > this heartbeat network. > > But with a more-than-2-nodes HA cluster, is it always worthwhile to > have two > heartbeat networks ? My understanding is that if one node can't have > contact > from other nodes in the cluster due to a heartbeat network problem, > as it is > "isolated", it does not have quorum and so is not authorized to > fence any other node, > whereas other nodes have quorum and so will decide to fence the node > with problem. > Right ?
Right, but wouldn't it be better to have no need to shoot anyone? > > So is there any other advantage to have more than 2 heartbeats networks > in a more-than-2-nodes HA cluster ? > > 2/ if the future of the HA stack for Pacemaker is option 4 (corosync + > cpg + cman + mcp), Option 4 does not involve cman > meaning > that cluster manager configuration parameters will all be in > cluster.conf and nothing more in > corosync.conf (again that's my understanding...) , Other way around, cluster.conf is going away (like cman) not corosync.conf > from memory there > is any possibility > to set two heartbeat networks in cluster.conf (Cluster Suite from RH > was working only > on 1 heartbeat network and if one wanted to work on 2 hearbeat > netwoks he has to configure > a bonding solution). > > Am I right when I write "no possibility of 2 hb networks with stack > option 4" ? No > > Thanks a lot for your responses, and tell me if some of my understanding > is not right ... > > Alain > > > _______________________________________________ > Linux-HA mailing list > Linux-HA@lists.linux-ha.org > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems > _______________________________________________ Linux-HA mailing list Linux-HA@lists.linux-ha.org http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
