hello, On 10/27/2011 09:34 PM, Bart Coninckx wrote: > Hi, > > > I found this a rather tough one. > > I have a dual primary DRBD setup for Xen live migration. > The DRBD part is taken care of by a master drbd resource (linbit). It > has a monitoring operation that puts it primary (master) if it's > secondary (salve) for some reason. > I was surprised to see that in case of a drbd node with an invalidated > resource, the resource was happily put into primary (master) state > during the sync (so while not being uptodate).
You also noticed the different promotion scores? > Obviously this poses a problem, as the cluster might decide to start a > Xen DomU on the non-uptodate drbd node. Not really as long as the resources are connected. It is completely valid to use a Primary that is SyncTarget, blocks that are not uptodate when requested are prefetched from the SyncSource. > > Is there any way I can avoid that with a constraint? Or should I go > about things differently so it is not able to set the resource into > master before the acutal sync is done? There would be different ways .... changing master-max to 1, add an anticolocation constraint for the Master role and the SyncTarget, or simply don't start Pacemaker on the SyncTarget if you expect a very long resync time ... start DRBD manually and wait for the sync to finish. Regards, Andreas -- Need help with Pacemaker/DRBD? http://www.hastexo.com/now > > > Thx !!! > > 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://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
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_______________________________________________ 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://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
