The guy that implemented our SourceOne had just been using 2 TB vmdks attached to the server and when one would run out of space would have to point SourceOne to a new location.  I'm thinking of creating an RDM and moving everything to it.  Looks like max size I can make is 16 TB and I currently have about 8 TB of space used and we've been going on SourceOne for at least 3 years so that should get me about 3 more years I hope.  Any reason I should not use this method?

Any other recommendations for storage for SourceOne?