On Sat, 2007-12-01 at 15:21 +0100, Ferry Harmusial wrote: > Hello All, > > When I use a quorum disk in 4u5 it does not prevent fencing after > missing too many heartbeats. That's correct. > http://sources.redhat.com/cluster/faq.html#quorum I should clarify this answer (esp because I probably reviewed it). It's not quite accurate: (A) Basically, it does kind of the contrapositive of what is mentioned in the answer with regards to advertising / checking: * We check our own fitness for participation in the cluster and advertise it to the other nodes via the quorum disk. * In the event of a failure, heuristics - instead of votes or a race-to-fence - can be used to determine the quorate partition (and therefore the partition that fences the other partition(s)). (B) Nothing which currently ships with linux-clluster allow multiple cluster partitions to continue running (like RHCS3 did) after a split. With correct heuristics, one partition will always win - and fence the other partition(s). I apologize for the confusion. (Note: RHCS3 will continue running w/o fencing, but in a degraded state; you cannot move around services or alter the configuration safely while the cluster is split...) The qdisk(5) man page (sections 1 & 2) has an explanation of how qdiskd works. -- Lon -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
