Hmm. USB fan-out is pretty cheap (the cabling is not fussy). Schedule maybe 70% of the raw bandwidth and you should have enough to drive 6-7 servers at 1GBit fr

Hmm. USB fan-out is pretty cheap (the cabling is not fussy). Schedule maybe 70% of the raw bandwidth and you should have enough to drive 6-7 servers at 1GBit from each root hub. If you know your servers are less chatty you can get away with less guaranteed bandwidth. Can also play games with isoch. You can even add redundancy by connecting each Pi server to more than one root hub. Writing the USB-based switch for this would be fun (probably someone has done this, though).