We are about to organize our data in a centralized spatial data system. The system would provide various services (mainly supporting ftp access, geodatabase editing, and several web mapping applications).
The data we already have is sized around 15TB, is expected to constantly increase, and consisted of spatial databases, aerial imagery, lidar data, and some non-spatial data. Furthermore, I understand that only a small portion of data would be actively accessed, and the storage is a sort of central repository (traffics and transfer rates are not that big deal in that manner).
I don't have any experience in managing such a big storage tier. I am under the impression that I have to purchase some NAS. However, I am not quite sure how should I plan the architecture of the storage tier (distributed or a single device), and what hardware specifications should I look for if the aim is 20TB capacity right now?
Suggestions are appreciated.