On Fri, Sep 11, 2009 at 09:50:56AM +0200, Michael Schwartzkopff wrote: > Am Donnerstag, 10. September 2009 19:25:53 schrieb Lars Ellenberg: > > On Thu, Sep 10, 2009 at 05:10:39PM +0200, Michael Schwartzkopff wrote: > > > Hi, > > > > > > I configured a dual master DRBD-8.3.2. When the nodes stat there is no > > > problem. Both DRBD become master. But when I set on node to standby and > > > wake it up again, the DRBD on that node stays secondary and does not > > > become master. > > > > > > My config: > > > primitive resDRBD ocf:linbit:drbd params drbd_resource="r0" > > > ms msDRBD resDRBD meta notify="true" master-max="2" > > > > > > No further constraints. > > > > > > When the second node is online again ptest -sL shows: > > > (...) > > > resDRBD:0 promotion score on suse2: 50 > > > resDRBD:1 promotion scpre on suse1: -1 > > > > > > Since the "-1" prevents the resource from beein promoted, I understand > > > the behaviour of the cluster, but why isn't the resource beeing allowed > > > th become master on that node? > > > > > > Thanks for any enlightenting answers. > > > > Most likely it prevents you from shoting yourself in the foot ;) > > > > look at /proc/drbd and the kernel logs (appart from the ha.log, of > > course) on the drbd nodes to find out more. > > I bet you manoevered yourself into diverging data sets (aka DRBD "split > > brain"). > > > > If it turns out to be a drbd.ocf bug, > > let me know. > > Hi, > > another confusing fact: > > The primitive DRBD was created without a monitor operation. When I add a > monitor operation, better two (Master,Slave) the described problem goes away. > But in my understanding the complete setup should work as expected WITHOUT > the > monitoring operation.
Well, your understanding is wrong. If you want the details, there is a lot of magic going on associated with the master scores, see the drbd.ocf script, drbd_update_master_score. You should definitely configure notify. You may get away without notify, if you configure monitor, and wait for a few monitor actions to happen. -- : Lars Ellenberg : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com DRBD® and LINBIT® are registered trademarks of LINBIT, Austria. _______________________________________________ Pacemaker mailing list Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker
