Guys, thanks for the comments.
https://www.maxtronic.ru/exasan.files/ExaSAN.jpg – this solution will come about $24K with hdds and metasan licenses, 4 seats. In US this brand name is Arena. I also noticed that many solutions that are under discussion on this forum are just not in local market and import makes no sense.
I would say that 60-90MB per seat would be enough for me when lets say 3 seats get that speed and network rendering goes on (15 machines of AE network rendering) . But again, we only work with frames’ sequences, where each file size is smaller comparing to footage from camera, so data tranfer rate i assume to be smaller.
Also what is the issue with multiple simultaneous access? If the product promises 600Mb/s does it mean that 6 workstations will get 100Mb/s at a moment?
Note that in case of maxtronics $12K is just the price of drive array. Is there a solution like PC server with multiple network cards each connecting a workstation and one for the global switch? That would be a cheap fix as i imagine.