As I'm getting close to filling up my DNS-323, I thought for a moment that I might want to just get a dns-343, put my 2 1TB drives from my 323 in there, and add two more drives.
But can you simply take two mirrored drives from the 323 and stick them in the 343 and expect it to work?
Apologies if this has been asked before, I wasn't able to find it when searching.