Brian from Backblaze here. > what colo facilities have max bandwidth to you Our primary colo is SunGard in Rancho Cordova, California. I believe we are curre

Brian from Backblaze here. > what colo facilities have max bandwidth to you Our primary colo is SunGard in Rancho Cordova, California. I believe we are currently provisioned for about 220 Gbits/sec (in this one facility alone). I'm not completely sure what this would top out at if we asked for more, but it is a colocation facility with a bunch of network providers such as Cogent, GTT, Century Link, etc. I kind of expect they can provide anything we ask for? > what is my likely MB/s at the top-performing location I have three answers, you can choose one. :-) 1) If you want to download a file once after a very long time of not accessing it (meaning it is not in the "B2 cache"), and with one thread, it must be fetched from the vaults to the "caching layer". Spooling a single file off of the vaults with one thread is relatively slow at about 15 Mbits/sec. 2) If the file is already in the caching layer, then it is fetched from local SSDs already inside the caching servers. Each individual caching server has a 10 Gbit/sec network card so if you only have one thread then you are absolutely limited to 10 Gbit/sec (and realistically the caching servers are not completely idle so a realistic number might be only 3 or 4 Gbit/sec). 3) If you want to fetch many files with many threads, fetch one file at a time with each thread. I'm not sure how many HTTPS threads an EC2 node can handle, maybe 200 safely? If it isn't in the cache then you get 200 * 15 Mbits/sec = 3,000 Mbits/sec = 375 MBytes/sec. If it is coming out the cache even faster? Hope that helps!