Hi, On Wed, Jan 23, 2013 at 11:28 PM, Brian J. Murrell <br...@interlinx.bc.ca> wrote: > On 13-01-23 03:32 AM, Dan Frincu wrote: >> Hi, > > Hi, > >> I usually put the node in standby, which means it can no longer run >> any resources on it. Both Pacemaker and Corosync continue to run, node >> provides quorum. > > But a node in standby will still be STONITHed if it goes AWOL. I put a > node in standby and then yanked it's power and it's peer started STONITH > operations on it. That's the part I want to avoid.
You have to explain what AWOL means in this context, even in a 2-node cluster, putting one node in standby without changing no-quorum-policy to ignore or setting stonith-enabled=false will just move off the resources from the node. Failure to stop a resource running on a node which is in the shutdown procedure (which means resources will be stopped - shutting down Pacemaker or by putting the node in standby would have the same effect on the resources, telling them to stop) will lead to STONITH. So just to emphasize this again, if there is a stop failure, regardless of how you turn off the resource (Pacemaker shutdown, putting the node in standby, telling the resource to move to another node, etc.), that will STONITH the node. Now, going back to no-quorum-policy, default action is stop, so in a 2-node cluster, if you shutdown Pacemaker without setting no-quorum-policy to ignore, when quorum is lost, resources on the remaining node stop. By putting the node in standby, quorum is still met, this does not take place. Once a node is in standby, if you want to stop pacemaker and corosync, that won't lead into the "node running AWOL" situation you've mentioned earlier. Having more than 2 nodes in a cluster means shutdown of pacemaker and corosync/putting the node in standby won't affect quorum as the other nodes still work. Either way, choose whatever fits your requirement best, I just added some comments related to how this would work and what would be the possible problems in a 2-node cluster. HTH, Dan > > b. > > > > _______________________________________________ > 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://bugs.clusterlabs.org > -- Dan Frincu CCNA, RHCE _______________________________________________ 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://bugs.clusterlabs.org
