At fabchannel.com we are building a big streaming video archive of live concerts. Because we shoot shows every week we are overwhelmed with DVCAM tapes (DV25 is our source). And this is not working for us. Although it is reasonably safe to store all of the concerts on tape we cannot re-edit the shows without capturing the shows again. We are also not capable of transcoding our entire archive to the newest codecs and bitrates. That's why we are looking for a harddisk solution.
I'm thinking of a SATA RAID 5 storage system up to 15-30 TB. This would be the big DV-stream vault where our editors would download the DV-streams of their choice from to edit them on their own SATA RAID0 workstations. From this vault we would also be batch-encoding our entire archive once in a while.