...

% bbcp -z -P 2 user@SomeRemoteHost:/dev/zero /dev/null
user@SomeRemoteHost's password:
bbcp: Creating /dev/null/zero
bbcp: At 090414 02:59:48 copy 0% complete; 5461.3 KB/s
bbcp: At 090414 02:59:50 copy 0% complete; 13639.7 KB/s
..

4 Tuneup

Choosing an optimal value for TCP window size

The general rules of "thumb" are:

• the higher the RTT time is - the bigger the window should be
• the "bumbier" (higher probability of dropping packets en-route) network is - the smaller the window should be

5 Usefull links

One cane find useful tips on how to tun up TCP parameters on machines involved into the data transfer to get the highest data transfer rate with bbcp:

• http://pcbunn.cithep.caltech.edu/bbcp/using_bbcp.htm - the link provides usefull tips on tuning up TCP parameters on machines involved into the data transfer.