How can I prevent my service from failing during recovery if it cannot unmount a filesystem resource in a RHEL 5 or 6 High Availability cluster with rgmanager?

Solution Verified - Updated 2018-03-02T02:28:50+00:00 -

Issue

How can I prevent my RHEL cluster service from failing during relocation if it cannot unmount a filesystem resource?
A service is up and running with 1 or more mounted file systems. Some user has left a session open that is cd'd into that file system structure. When I manually migrate the service it fails as the filesystem being accessed cannot unmounted.
clusvcadm -r <service> -m <node> failed.
A cluster service containing an fs resource failed while stopping or relocating:
```
node1 clurgmgrd: [8584]: <err> 'umount <mount point>' failed, error=0
```

Red Hat Enterprise Linux (RHEL) 5 or 6 with the High Availability Add On
rgmanager
One or more <fs/>, <clusterfs/>, or <netfs/> resources in a service in /etc/cluster/cluster.conf

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