hey, I am needing about 12 TB of storage with it able to be accessed by 6-8 Mac computers in the office via network. we already have Mac os X server installed on the mac pro where the storage would be kept at. We need to be able to keep this server on a local network only accessible by the co-workers in this office. We are a photography and video production office so we are needing to be to transfer data fairly quickly. What do we need to get this going?