[Pacemaker] STONITH without mandatory success possible?

[Vladislav Bogdanov]

20.06.2013 03:12, Sven Arnold wrote:
> Hi Doug,
> 
>> I have some 2-node active-passive clusters that occasionally lose
>> Corosync connectivity.  The connectivity is fixed with a reboot.
>> They don't have shared storage so stonith doesn't have to happen for
>> another node to take control of the resource.  Also they are VMs so I
>> can't use a standard stonith method.
> 
> If you use virtual machines connected via a local bridge you could try
> to disable multicast snooping on your bridge to improve corosync
> connectivity. Similar to:
> 
> 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.