Total volume usuage, multiple volumes

I'd like to create a report/resource that will display a list of volumes, their total capacity, space used, available, etc., and totals of the the three. This would be used for a single purpose, multi-volume NAS. I use a report now that show the utilization and I can add the up manually. It would also be nice to graph the growth of the entire volume set.

Another question, somewhat related:  Is it possible to see the SQL queries behind the reports made in the Orion designer?