On 09/03/2015 11:44 AM, Streeter, Michelle N wrote: > I was trying to get a HA Cluster working but it was not failing over. In > past posts, someone kept asking me to get the fencing working and make it a > priority. So I finally got the fencing to work with VBox. And the fail over > finally started working for my HA cluster. When I tried to explain this to > my lead, he didn't believe me that the fencing was the issue with the fail > over. So, would someone help me understand why this happened so I can > explain it to my lead. Also, when I was trying to get Pacemaker 1.1.11 > working, it was failing over fine without the fencing but when I added more > than one drive to be serviced by the cluster via NFS. The drives were being > serviced by both nodes almost as if it was load balancing. It was suggested > back then to get the fencing working. So I take it if I went back to that > version, this would have fixed the issue. Would you also help me explain why > this is true? > > Michelle Streeter > ASC2 MCS - SDE/ACL/SDL/EDL OKC Software Engineer > The Boeing Company
Hi Michelle, Congratulations on getting fencing working. There's not enough information about your configuration to answer your questions, but fencing is more a requirement for general cluster stability rather than a solution to the specific problems you were facing. Regarding load-balancing, I'm not sure whether you mean that a single resource was started on multiple nodes, or different resources were spread out on multiple nodes. If one resource is active on multiple nodes, that means it was defined as a clone or master-slave resource in your configuration. Clones are used for active-active HA. If you want active-passive, where the resource is only active on one node, don't clone it. If instead you mean that multiple resources were spread out among nodes, that's Pacemaker's default behavior. If you want two resources to always be started together on the same node, you need to define a colocation constraint for them (as well as an ordering constraint if one has to start before the other), or put them in a resource group. _______________________________________________ Users mailing list: Users@clusterlabs.org http://clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org