On Sun, Mar 10, 2013 at 8:35 PM, Stefan Förster <cite+pacema...@incertum.net> wrote: > Hello world, > > according to [1] using the pacemaker plugin with corosync is > deprecated and will cease to be supported at some point in the future > (on RHEL!).
A small but important distinction... The plugin has never been supported on RHEL. What it changing is that at some point it will no longer be _supplied_ either. In fact prior to 6.4, Pacemaker only had Tech Preview status - using the CMAN plugin instead of our home grown one was key to that changing. > Instead, the use of CMAN and running pacemaker as a > standalone service is recommended. > > Now, unfortunately, the former (corosync with pcmk plugin) is exactly > what we are using on two fileservice clusters, so we need a migration > path with no downtime. I'm going to do some extensive testing later > this week, but I'd be grateful for a bit of advance help. I think what > I will try is: > > 1. Put pacemaker into maintenance mode. > 2. Stop corosync, remove corosync.conf and the config snippet loading > pacemaker from within corosync. > 3. Install cman and ccs. > 4. Generate new cluster.conf, using appropriate tools. > 5. Start cman, start pacemaker. > > The two crucial questions are: > > 1. In step (2), will pacemaker stop resources when it's brought down, > despite being in maintenance mode? No. _However_, you will want to stop any cluster filesystems as they're going die anyway. Both OCFS2 and GFS2 require the dlm which requires corosync/cman. Without those running, the filesystems can't function and will panic. > 2. In step (5), will the pacemaker resource configuration be > preserved throughout this migration? Absolutely. The only thing that changes is corosync.conf All the resource related configuration stays in cib.xml and is unchanged. > > Any insights would be greatly appreciated. > > > Cheers > Stefan > > [1] > https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.4_Technical_Notes/pacemaker.html > > _______________________________________________ > 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 _______________________________________________ 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
