I can not define for you technically how this works, I do know that the accusystem does allow for shared storage for multiple systems(4) with proprietary software that allows access to the storage, so systems can read and write media at constant speeds. This has only been possible with SAN/or other 10gb(TB to 10gbe) options before. These systems are new, and as far as I know only a few months old. I have put in place many 10 gbe over thunderbolt solutions for movies I have produced, the new products allow for more users strictly over TB at constant speeds.
Accusystem uses Xsan for the metadata control, so it is essentially a SAN product.
Imagine that you had a Fibre Channel SAN array, a Fibre Channel switch, and four MP6,1 systems.
You could put a T-Bolt to Fibre Channel dongle on each, run the four fibres to the switch, connect the FC SAN array to the switch, install Xsan, and go.
With the Accusys, you connect the four T-Bolt cables to their box, install Xsan, and go. They've just moved the four dongles and the switch (and the related complexity) inside their box.
Actually a very impressive solution for shared storage for very small workgroups - but completely irrelevant to koyoot's holy grail of HSA and future coherent fabrics that let your Apple Watch be part of the rendering farm.
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It is IP so you could build a Thunderbolt router that routes packets (which I don't think exists, but it is possible.) You could also just take a Mac Pro and basically use it as an expensive Thunderbolt router. Bridge the ports in software so that packets can get routed. IP over Thunderbolt isn't special. You could even IP over Thunderbolt onto a standard ethernet network if for some reason you didn't just use an ethernet cable.
IP over Thunderbolt hands out IP addresses just like ethernet so you can resolve anything else with an IP address. Just a matter of having a router that can route packets coming in over Thunderbolt.
Software is magical, and can make many things possible that once seemed like dreams.
I'm not stating that some things are impossible some time in the future, I'm talking about what you can do today or tomorrow. (And not some distant "tomorrow", I'm typing this late Tuesday afternoon, and I'm talking about what you can do Wednesday morning.)
You have some interesting ideas, but those devices don't exist and I can't use them tomorrow. koyoot talks about cache-coherent fabric interconnects like they were released the end of last week - but at best they are three or four years in the future and may never happen.
"Possible" doesn't bring in billable hours.
But to your specific points:
"It is IP"
It is SAN, not IP.
"IP over Thunderbolt hands out IP addresses just like Ethernet"
Ethernet does not hand out IP addresses, period. Extreme confusion here.
In any event, all current IP over T-Bolt implementations are point-to-point between two systems.
If you want to go faster than the 16 year-old GbE ports in the MP6,1, you have two choices. T-Bolt between two systems, or buy a T-Bolt to 10 GbE dongle for each system and connect to your 10 GbE switch.