On Wednesday 23 December 2009, Dejan Muhamedagic wrote: > Hi, > > On Tue, Dec 22, 2009 at 06:52:34PM +0100, Michael Schwartzkopff wrote: > > Hi, > > > > The Lustre Filesystem uses a feature called Multiple Mount Protection to > > make sure that one device is really only mounted by one node. > > > > My question now: Is this feature really needed in a pacemaker cluster? > > > > In a pacemaker cluster with correctly enables STONITH the cluster manager > > takes care that the resource is only mounted on one node, isn't it? At > > least in my understanding it should. Only after getting the positive > > feedback that the resource was stopped on the other node or the other > > node was fenced pacemaker starts the resource on the second node, or? > > Right. But I guess you knew that.
The problem are those annoying bugs that tell you the device is umounted although it is not. My lustre server agent, which I will submit here once I find some time to review it again, will protect you from this. I least I hope I did catch all Lustre bugs... And then pacemaker does not protect you to mount a filesystem, for which presently e2fsck is running. Cheers, Bernd -- Bernd Schubert DataDirect Networks _______________________________________________ Pacemaker mailing list Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker
