>>> Chris Walker <[email protected]> schrieb am 15.12.2016 um 21:00 >>> in Nachricht <cafd1iuqfxllchwiac8ihk9t+c9rv44k-8juk8by+c6aw6nr...@mail.gmail.com>: > Hello, > > I have a quick question about dc-deadtime. I believe that Digimer and > others on this list might have already addressed this, but I want to make > sure I'm not missing something. > > If my understanding is correct, dc-deadtime sets the amount of time that > must elapse before a cluster is formed (DC is elected, etc), regardless of > which nodes have joined the cluster. In other words, even if all nodes > that are explicitly enumerated in the nodelist section have started > Pacemaker, they will still wait dc-deadtime before forming a cluster. > > In my case, I have a two-node cluster on which I'd like to allow a pretty > long time (~5 minutes) for both nodes to join before giving up on them. > However, if they both join quickly, I'd like to proceed to form a cluster > immediately; I don't want to wait for the full five minutes to elapse > before forming a cluster. Further, if a node doesn't respond within five > minutes, I want to fence it and start resources on the node that is up.
I don't know the details of pacemaker, but in HP-UX ServiceGuard there was a "cluster formation timeout". As far as I understood that it was used when all cluster nodes reboot, avoiding the situation that a cluster will be built wit some nodes, then others joining withing a few seconds. So the cluster would wait for nodes until "forming the cluster" (one could also want a cluster to form once some minimum number of nodes is ready to join). However once a cluster is fomed, any new node would immediately join the existing cluster. Is that what you want? > > With Pacemaker/Heartbeat, the initdead parameter did exactly what I want, > but I don't see any way to do this with Pacemaker/Corosync. From reading > other posts, it looks like people use an external agent to start HA daemons > once nodes are up ... is this a correct understanding? > > Thanks very much, > Chris _______________________________________________ Users mailing list: [email protected] http://lists.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
