Small fast network with Mac mini server and Promise Pegasus?

I have 7 Mac Pros and iMacs that need to be connected to the same storage. I'm doing non MPI-based numerical modeling so the transfer rates have to be fast but not infiniband fast. I'm considering a setup with a Promise Pegasus thunderbolt RAID connected to a Mac Mini running Lion server for Access controll/Roaming homer directories. The Mac Pros and iMacs would the be connected via 1Gb ethernet.
My question is where the bottlenecks in this setup would be. The server software/hardware? The network? What else am I forgetting

I assume you're looking at Mac mini because you've already run the numbers on Mac Pro and ruled it out. I wonder how many buyers are opting for Mac mini solely for those Promise Thunderbolt arrays.
I also assume that each of your users is currently using a single gigabit Ethernet port to connect to the LAN.
If these assumptions are accurate, then I think that a Mac mini will work as long as you and your users have appropriate expectations. The win from putting this server in place won't be networked storage that outperforms an internal SATA drive, although in bursts it probably can. The solution you've described is smart because it's centralized, securable and adds a layer of data protection (RAID).
You asked about bottlenecks. I can think of three, two of which you can work around now or in the near future. The first is Mac mini's slow internal hard drive(s). You'll have a solution in hand: Boot Mac mini from the array. Some consider that to be a controversial choice, but you shouldn't spend extra for the Mac mini server with dual 7200 RPM drives. The less costly Core i7 configure-to-order upgrade will give you a bigger boost.
Booting from the array also protects you from the most likely "repair" scenario for Mac mini: Swapping out your entire machine.
The second issue is Mac mini's lack of an expansion bus. If you get more users or start using apps that demand more from the LAN, you might want to fire up additional gigabit Ethernet ports. Mac mini has just one. At present, the only way to add a gigabit port is with a Thunderbolt PCIe bus expander. Early next year, there should be more options that connect directly or via an intermediate bus like ExpressCard/34 or USB 3.0.
The one limitation you're powerless to work around is RAM. Mac mini tops out at 8 GB. That meets requirements, but it will be tight if you try to use Mac mini as a client and a server. I deploy them headless so no one's tempted to use the console.
You can improve your odds that gigabit will cut it by using heavy, short Cat6 cables and a switch dedicated to the Mac LAN. Use Mac mini's built-in Wi-Fi to keep Remote Desktop and other low-priority traffic off the wire.
Whatever solution you choose, I wish you the best of luck.

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