I'm not sure if this is an issue, or configuration problem, or just the way it is but I am doing a large transfer of files between data centres, Washington DC -> Salt Lake City, around 14TB total, average file size is about 80mb.
Each file seems to average at around 600 KB/s, but i can transfer 10 at a time multi threaded and each will do around the same speed.
But if i open another instance of my FTP client (Filezilla) and do the same with that, I can transfer another 10 at the same speed, I have done this with 4 clients all transferring different files giving me a total speed of around 22+ MB/s.
Why can't individual files transfer any faster than 600 KB/s, i clearly have the bandwidth and speed to do this.
I am using Filezilla server at the receiving end, there are no speed limits set on the client or server.