[ClusterLabs] DRBD split brain after Cluster node recovery

[ArekW]

I have active-active NSF on gfs2 on dual-primary DRBD. As for stonith
I have no reason to think that it is not working because when I
poweroff one node, the second node can bring it up automatically. Also
I have situation where fence shut down or reboot another node. It
seems than it is working well. I've added also drbd-fence. Now I'm
testing it again.