>From memory you can use resource (SAN) fencing - that is you can terminate other nodes connection to the SAN via the SAN switch or the SAN controller itself. This can be used as a primary fencing mechanism and will prevent data loss in the contexts you mention.
On 7 January 2011 08:38, Robert van Leeuwen <vanleeu...@stone-it.com> wrote: >> In a simple case, we want to prevent two nodes using a shared file-system >> without coordination. If they loose contact with each other and can't >> coordinate their access, one must die. (Even if you make it hard for them to >> loose contact by providing multiple communication channels, you have to >> assume >> it will happen and, so, we work with this case.) > > Not a real help but... > My preferred way is to create a 3 node cluster even if one node is only for > voting and will not run any resources. > With 3 nodes you can correctly "vote" about who's online & offline (2 vs 1 > vote). > When none of the 3 nodes see each others quorum will be lost on all nodes and > the cluster will freeze (or whatever you configure). > > Some cluster suites use a quorum disk for the creating the 3rd vote but as > far as I know Pacemaker does not support this. > > I'm afraid if a third node is not possible you will have to make absolutely > sure the network link stay's up but it won't be 100% fool proof if somebody > starts messing with the cables... > (you're best bet will be multi-path + cross cable e.g.) > > > Robert > > _______________________________________________ > Pacemaker mailing list: Pacemaker@oss.clusterlabs.org > http://oss.clusterlabs.org/mailman/listinfo/pacemaker > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: > http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker > -- Best Regards, Brett Delle Grazie _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
