On Tue, 2009-08-11 at 14:30 -0500, Paras pradhan wrote: > I have a 3 nodes xen cluser under centos5.3 that host linux virtual > machines. Node1 and Node2 got virtual machines but not on Node3. Node > 3 is basically used when Node1 or Node2 goes down. This is working OK. > Now when I turn off both Node1 and Node2. Then quorum is dissolved > and my cluser fails. I do not see any virtual machines in Node3 if the > other 2 nodes die. > > So, how to handle this situation? I need node 3 to be alive a working > to host virtual machines when Node 1 and Node 2 is shut down. 1/3 is not enough to constitute a quorum; you will have to use a quorum disk or some other method in order to allow a quorum of 1 (out of a possible 3). You could make that node a high weight (like 3 votes), but then when it fails, the other 2 nodes will not be quorate. The reason for this sort of operation is to prevent a split-brain: If the 1 node is alive and running virtual machines, and the other 2 nodes come online but *cannot* talk to the already running node, they can start up the virtual machines, causing data corruption. -- Lon -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
