[Pacemaker] STONITH without mandatory success possible?

[Andrew Beekhof]

On 20/06/2013, at 11:50 PM, Doug Clow <doug.clow at dashbox.com> wrote:

> I'll do some experiments to see if I can get Corosync more reliable.  I'm using Corosync v1 as part of cman-corosync-pacemaker.  RRP with one port on a switch and the other port on a crossover cable between the two hosts (although technically each port is still part of a vSwitch since its a VMware VM). 
> 
> I do have fence-agents installed, but on Centos its missing the the null and ssh devices.  Andrew, if you mean I can have stonith devices without enabling stonith globally thereby making success optional I will try that out.  That would be just what I need.

No. I mean if you don't care if they succeed you can just turn fencing off.
Or, use something like fence_dummy (not shipped) in a fencing level:
   http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html/Pacemaker_Explained/_advanced_fencing_configurations.html

> 
> Thanks all,
> Doug
> 
> 
> On Jun 20, 2013, at 1:38 AM, Sven Arnold <sven.arnold at localite.de> wrote:
> 
>>>> 
>>>> echo "0" >  /sys/class/net/virbr0/bridge/multicast_snooping
>>> 
>>> That results in multicast packets are broadcasted to all bridge ports. I
>>> prefer to have igmp querier turned on on a central switch.
>>> 
>>> 
>> 
>> I had the impression that the OP used virtual machines on a local (virtual and private) network. I had such a setup with my first experiments and experienced (timing) issues with corosync messages until I turned snooping off.
>> 
>> But you are right, on my production system I have turned on both multicast_snooping and multicast_querier.
>> 
>> For reference, there was this bugreport that was helpful for me:
>> https://bugzilla.redhat.com/show_bug.cgi?id=880035
>> 
>> Regards,
>> 
>> Sven
>> 
>> 
>> 
>> 
>> _______________________________________________
>> Pacemaker mailing list: Pacemaker at 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 at 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