Hi Steve,
As far as I know this scenario is not supported scenario, In Windows Server 2008 R2, the Cluster Shared Volumes feature included in failover clustering is only supported for
use with the Hyper-V server role.
The creation, reproduction, and storage of files on Cluster Shared Volumes that were not created for the Hyper-V role, including any user or application data stored under the
ClusterStorage folder of the system drive on every node, are not supported and may result in unpredictable behavior, including data corruption or data loss on these shared volumes. Only files that are created for the Hyper-V role can be stored on Cluster Shared
Volumes. An example of a file type that is created for the Hyper-V role is a Virtual Hard Disk (VHD) file.
More information:
Deploying Cluster Shared Volumes (CSV) in Windows Server 2008 R2 Failover Clustering
http://blogs.msdn.com/b/clustering/archive/2009/02/19/9433146.aspx
Backing Up Cluster Shared Volumes in a Failover Cluster in Windows Server 2008 R2
http://technet.microsoft.com/en-us/library/ff182356(WS.10).aspx
Im glad to be of help to you!