On Wed, Oct 03, 2012 at 04:26:35PM +0000, Dietmar Maurer wrote: > > I guess you're talking about the dlm_tool ls output? > > Yes. > > > The "fencing" there > > means it is waiting for fenced to finish fencing before it starts dlm > > recovery. > > fenced waits for quorum. > > So who actually starts fencing when cluster is not quorate? rgmanager?
fenced always starts fencing, but it waits for quorum first. In other words, if your cluster looses quorum, nothing happens, not even fencing. The intention of that is to prevent an inquorate node/partition from killing a quorate group of nodes that are running normally. e.g. if a 5 node cluster is partitioned into 2/3 or 1/4. You don't want the 2 or 1 node group to fence the 3 or 4 nodes that are fine. The difficult cases, which I think you're seeing, are partitions where no group has quorum, e.g. 2/2. In this case we do nothing, and the user has to resolve it by resetting some of the nodes. You might be able to assign different numbers of votes to reduce the likelihood of everyone loosing quorum.
