[having a bit of a problem getting this to post...]
We are going to try a Drobo FS as our next storage step. That version connects to the network and should be visible from all connected computers. I don't know that the B3400 will have an interface to see it directly, but absent that we will do expect to be able to use one of the other computers to do copies across the network. A extra work (network and computer wise), and not integrated, but we are basically concerned with "archive" level storage. Saving programs that have been encoded after their playback runs are done, and to gradually build an encoded library from the backlog of our many years of tapes.
We have had an older Drobo with a DroboShare that fits into the picture (e.g. hung on the network) more or less the same way as the new FS, although it is end of life now, and said to be much slower than the FS.
I would REALLY like to see a good answer in this space. I know TelVue/PSG talks about an archive server solution, but it just never comes together as a solution for us (maybe they are just not trying hard enough? :-) ). As long as it is not clear where the storage size limits are going in the TelVue/PSG systems (e.g. Linux limits and what the server UIs do about it) we don't have an attractive path forward to commit to. Our staff wants to keep everything they encode, more or less, so our storage (and redundancy, and backup)needs will continue to grow indefinitely. The disk capacity should be available affordably in the time frames we will need it, but we are looking at wanting to see the path forward to several 10s of TBs. That is not apparent to us in the Linux based paroducts at this point (and I learned a very long time ago not to buy future maybes - I am still waiting for some of the features that would be coming RSN for our original B1400 - not going to happen, and no promises even on the B3400 now).
But the Drobo FS is not bad as a bandaid - That FS, with five 2TB drives, is costing us something like $1500, and it has the incremental, one at a time, do-it-yourself drive upgrade capability that others here have suggested would be attractive.