We have about 20 servers with about a combined 1.6 TB of "usable" free storage space. Is there a software product out there that can combine all of the free space into one easy to manage console? Ideally I would want the users to map to say \\fileserver and they would not know which server the files actually go to. I would like to backup files from this console instead of from the actual server that is holding the information. I would also like it to be somewhat fault tolerant meaning if a physical server went down it wouldn't make those files unavailable, kind of like RAID 5 except from a file level.
I have read about some high end products but I am wanting something cheap since it is just for user files not application or production data.