I was formerly a smoke artist at a post facility, back when it was only available on SGI workstations. Shared storage was not common back then. We now use Gigabit Ethernet shared storage which only has enough bandwidth for about 90 megabytes per second per client, which is enough for uncompressed SD or compressed HD, but not nearly fast enough for the 500 Mb/second recommended for smoke on Mac. The RAID does do 750 Mb/second at the server but of course GigE bandwidth can't match that.
Shared storage is a big part of our efficient workflow with Final Cut Pro, but if we need uncompressed HD we do it in a room with dedicated storage for finishing. Just wondering what we'd need to get to keep the projects on a SAN and still be able to take advantage of the XML transfers from FCP to smoke, without moving projects from the SAN to local storage.
So it sounds like if you need to finish in uncompressed HD, you need to work in the room with dedicated storage. If your SAN isn't capable of capturing uncompressed HD, then you will have to capture it in the room that can.
500MB/s is a guideline for 2 streams uncompressed HD on the Smoke. You might be able to get away with a lower speed, but if anything goes wrong, Autodesk support will point at your storage as the problem.
So, to be able to work in uncompressed HD from your SAN you will need a faster SAN.