drbd.conf:

# You can find an example in  /usr/share/doc/drbd.../drbd.conf.example

include "drbd.d/global_common.conf";
include "drbd.d/*.res";

global_common.conf:

global {
	usage-count yes;
	# minor-count dialog-refresh disable-ip-verification
}

common {
        protocol C;

	handlers {
		pri-on-incon-degr "/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notify-emergency-reboot.sh";
		pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh; /usr/lib/drbd/notify-emergency-reboot.sh";
		local-io-error "/usr/lib/drbd/notify-io-error.sh; /usr/lib/drbd/notify-emergency-shutdown.sh";
		split-brain "/usr/lib/drbd/notify-split-brain.sh root";
		fence-peer "/usr/sbin/rhcs_fence";
	}

	startup {
		become-primary-on both;
		wfc-timeout		600;
		degr-wfc-timeout	120;
	}

	disk {
		on-io-error  detach;
	}

	net {
		allow-two-primaries;
		after-sb-0pri discard-zero-changes;
		after-sb-1pri discard-secondary;
		after-sb-2pri disconnect;
		shared-secret "semo739omih36";
	}
	syncer {
		rate 300M;
		al-extents 257;
		verify-alg md5;
		}
}

OpenNMS.res

# This resource is used for the VMs of Node1

resource OpenNMS {
    device     /dev/drbd2;
    meta-disk  internal;

	on pclus1cent6-01.cl3m.sccon.de {
	    disk       /dev/sda7;
	    address    172.19.38.31:7790;
  	}

	on pclus1cent6-02.cl3m.sccon.de {
	    disk      /dev/sda7;
	    address   172.19.38.32:7790;
  	}
}