First setup drbd like this, ignore the Pacemaker stuff first: http://jensd.be/186/linux/use-drbd-in-a-cluster-with-corosync-and-pacemaker-on-centos-7.
These warnings from pcs are normal, because of systemd, could not resolve them yet.
In the Company we experienced a little Issue when working with NFS4 and the EMC Storage Solution ISILON.
On the firmware 8.0.X.X there is a slight problem with the NFS4 Protocol implementation. Usually a NFS Server should…