Wow, 255 Snapshots!
To see how this can be solved I need more details about your environment. The easiest way would be to run RVTools (http://www.robware.net/), export the results into an Excel file and attach this file to a reply post. You may remove some of the tabs in the Excel file if you don't want to post them, but make sure the datastore and disk related tabs remain in the file.
André