On 28 October 2010 10:21, Dejan Muhamedagic <deja...@fastmail.fm> wrote:
> Hi, > > On Wed, Oct 27, 2010 at 08:15:09PM +0200, Pavlos Parissis wrote: > > On 27 October 2010 19:46, Pavlos Parissis <pavlos.paris...@gmail.com> > wrote: > > > > > I did more testing using the clone type of fencing and worked as I > > > expected. > > > > > > test1 hack init script to return 1 on stop and run a crm resource move > on > > > that resource > > > result node it was fenced and resource was started on the other node > > > > > > test2 using firewall to break the heartbeat links on node with resource > > > result node it was fenced and resource was started on the other node > > > > > > As Dejan suggested I am going to run the same type of tests when 1 > fence > > > resource is used. > > > In this test I will try to cause a fencing on the node which has > fencing > > > resource running on it and see if pacemaker moves the resource before > it > > > fences the node. > > > > > > > > > > > > > > I did the same tests without cloning and pacemaker moves fencing resource > > before triggers a reboot on the node where fencing resource was running. > > So, cloning fencing resource and having just one fence resource have the > > same behaviour! at least for these 2 tests. > > now I don't know which configuration solution I should choose! > > Whichever you feel more comfortable with, providing that the > device really can support multiple connections simultaneously. > I'd opt for non-cloned version. It's simpler, it avoids possible > device contention. > > Thanks, > > Under which conditions does pacemaker initiate multiple connections to a fencing device? Given the fact that rackpdu agent uses SNMP, so connections limits <shouldn't> apply, I don't quite understand how cloned version will give me issues. I make a big assumption here that connections limits are not applicable when fencing device is contacted over SNMP . Furthermore, using cloned version a fence event triggers faster than non-cloned version, because in non-cloned version situation the resource must move to another node, if the node to be fenced holds the fencing resources. Because of the above, I selected for now the cloned version. But your mail worries a bit. what test can I do in order to make sure that the cloned version will not give me issues? Cheers, Pavlos
_______________________________________________ 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
