i didnt catch it in the pdf but a single deployment is supposed to push 200tb/s. Id ball park the capital cost aaround 1.25M USD.
the original 4u boxes do/did ~9gb/s of prod traffic each. peak/lab util was about 15gb/s. IIRC two of these boxes could cache nearly the entire library for a region.<p>The interesting bit is the new 2u hosts used specifically for hot content. only using 3x 10gig interfaces because the bus is too narrow. im guessing these hosts are pushing 20-24gb/s at peak. theyll have to be using a zeroish copy like sendfile() to just dma everything from disks to nic. looks like the 14 ssds can push 450-500MB/s, so theres the bus limit again. read scheduling will probably suck at that rate. but id wager that most of the bits served are super hot content being dmad straight from memory pages.