On Wed, Jan 12, 2011 at 09:30:41AM +0100, Robert van Leeuwen wrote: > -----Original message----- > To: pacemaker@oss.clusterlabs.org; > From: Patrick H. <pacema...@feystorm.net> > Sent: Wed 12-01-2011 00:06 > Subject: [Pacemaker] Speed up resource failover? > Attachment: inline.txt > > As it is right now, pacemaker seems to take a long time (in computer terms) > > to > > fail over resources from one node to the other. Right now, I have 477 > > IPaddr2 > > resources evenly distributed among 2 nodes. When I put one node in standby, > > it > > takes approximately 5 minutes to move the half of those from one node to > > the > > other. And before you ask, theyre because of SSL http virtual hosting. I > > have > > no order rules, colocations or anything on those resources, so it should be > > able migrate the entire list simultaneously, but it seems to do them > > sequentially. Is there any way to make it migrate the resources in > > parallel? Or > > at the very least speed it up? > > Patrick, > > It's probably not so much the cluster suite but is has to do with the > specific resource script. > For a proper takeover of a IP you have to do an arp "deregister/register". > This will take a few seconds. > As long as a resource script is busy the cluster suite will not start the > next action. > Parallel execution is not possible in the cluster suite as far as I know. > (without being a programmer myself I would expect it is pretty tricky to > implement parallelization "code-wise" and making 100% sure the cluster does > not break) > > You could consider to edit the IPaddr2 resource script so it does not wait > for the arp commands. > At you're own risk of course ;-)
There is the cluster option "batch-limit" (in the cib), see "configuration explained". and there is lrmd "max-children" (can be set in some /etc/defaults/ or /etc/sysconfig file, should be set by the init script). you can set it manually with lrmadmin -p max-children $some_number That should help you a bit. But don't overdo. Raise them slowly ;-) -- : 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 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
