I believe (but I haven't examined the protocol) that the issue is the ssh method of multiplexing the connection. It is akin to trying to transfer via CIFS.
The protocol is more chatty that it needs to be for that one task when done alone. The thing is that the SSH protocol was designed to be able to have multiple operations happening at the same time. You can have four terminal sessions, four file transfers and multiple X windows forwarded at the same time, over the same SSH connection. FTP just opens a TCP connection and sends the data raw, across it. Closing of the connection signals end of the transfer. So FTP will always be the fastest way to send data across a TCP connection. (UDP is another matter) Others that are familiar with the SSH protocol implementation would be able to describe it in more detail, if you want. On 2/23/06, Richard Labutis <[EMAIL PROTECTED]> wrote: > I am running aix 4.3, 5.1, 5.2, 5.3 using various > versions of openssh. > > why is there a speed limit in copying files from one > machine to another. The speed appears to cap out at > around 7-8 mb/sec. This is on a gigabit network. > I know encryption has overhead, but not that much. > scp and sftp is the commands used to copy files. > It makes no difference what version of ssh/aix, it all > has the same results. > > if I used rcp or ftp, it's very fast. > > > Any thoughts? > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > -- And, did Guloka think the Ulus were too ugly to save? -Centauri
