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Slow server-to-server FTP'ing on Windows




Posted by rscott, 07-28-2008, 07:44 AM
Hi all, I have a number of dedicated servers at different hosting companies, all with 100mbps burstable ports, using several versions of Windows (2003 or 2008, Standard or Enterprise). I've tried setting up FTP servers (the one that is part of IIS) on 4 of them, to transfer files between the servers. But, I can't get a single transfer to go faster than about 10-12Mbps. If I upload multiple files, each will go at right around 10-12Mbps (so I can get, say, ~50Mbps if transferring 5 files simultaneously). I've tried passive FTP, and I've tried tweaking the TCP settings (TcpWindowSize, GlobalTcpWindowSize, Tcp1323Opts), and the results are the same. Any ideas would be appreciated. -Scott

Posted by 24x7group, 07-28-2008, 10:37 AM
Scott, If 1 of the networks is slower than the other one, you won't be getting better speeds with that. It is possibe some connections are shared 100 Mbit lines where your server is connected to, and therefore you won't be able to burst the full 100 Mbit.



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