When Pacemaker is used with cman, Pacemaker provides the fencing capabilities.
So at the point Pacemaker is stopped, fencing is impossible.
This makes it unsafe for cman (which initiates fencing for its own reasons) to
continue running.
Also, CMAN's fenced is not very good at shutting down cleanl
# service pacemaker stop
Waiting for shutdown of managed resources. [ OK ]
Signaling Pacemaker Cluster Manager to terminate: [ OK ]
Waiting for cluster services to unload:.. [ OK ]
Stopping cluster:
Leaving fence domain...
