I would seriously consider the Terrablock by Facilis Techonology. Because it doesn’t need a separate metadata network, it is very simple to setup and administer. It can have either 4Gb or 2Gb Fibre Channel clients, with three server versions from 2Tb to 9.6Tb. With the new software version it can access two Terrabock units at once, accessing 19Tb. Also, there are NO client licenses – just add another FC card and you’re online.
https://facilis.net/products.htm
All this speed is not for free – clients can read the same volume simultaneously but can not write to the same volume simultaneously. However, we have used one for about a year and have had few situations that needed that and very few problems. In fact, we are about to add another Terrablock 12D server and will be able to access all storage from all clients.
We find that it administers itself, needs no optimization, and can share media between up to (I think) 20 offline clients (15s:1) or 14 online (1:1) clients in SD, or two editors in HD depending on your server model. The specs are on their website. It supports both OSX and Windows – Avid, FCP, and other clients.
It is very fast and simple to administer. It’s probably not for a facility with 100 siutes but if it fits your workflow requirements, I feel there is no better solution.
John McClary