Update the WSFC with latest packages from rhn-engineering-bmarzins 

Run the WSFC full validation without failures
Create the WSFC cluster with the shared scsi disk.
Write files to vm-a currently holding the shared disk reservation
Pause vm-a
Access the shared disk on the second vm-b cluster member and write some files.
Unpause vm-a
Access to the shared disk is restored to vm-a and is no longer accessable to vm-b.
Write new files to the disk