On Mon, Nov 11, 2002 at 04:30:05PM +0100, [EMAIL PROTECTED] wrote: > Mermgfurt ! > > I have some problem with syncing two machines which are connected > over a Gigabit-connection. I'm trying to use rsync with ssh because of > the authorisation mechanisms (keys). It starts quite ok with 18 MB/s > (this small speed may have something to do with our internal net) > and falls down to 400 KB/s (!!!). This happens over a long period > because those files I want to copy are very big (upto 70 GB per file). > Even though I tried to increase the blocking size the speed just goes > down and won't go up again. In fact it really writes 18 MB/s, it's not > just a problem of -partial or something similar. Ok, I haven't tried > it without ssh yet, but it really looks very strange. > The version is the rsync 2.5.6cvs version from debian-unstable. > > Thanks for any help !
You haven't really provided enough data to even guess what is limiting your performance. You need look at CPU utilization, I/O load and network load on both ends. It isn't likely to be the network unless there is contention, but CPU and/or I/O are probably the problem. I know in my case the reciever is CPU bound. You could also be suffering from buss contention. Is the 18MB/s actual data transfer (just what has changed) during actual transfer? If so you may be up against the limitation of your disk+file systems. My gut reaction is that 18MB/s is probably just short of the best sustained throughput you can get out of your disk subsystem as configured. I'd suggest testing to see how fast your receiver can handle sustained writes and how fast your sender can read. And burst rates don't count. You need sustained transfer rates. -- ________________________________________________________________ J.W. Schultz Pegasystems Technologies email address: [EMAIL PROTECTED] Remember Cernan and Schmitt -- To unsubscribe or change options: http://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.tuxedo.org/~esr/faqs/smart-questions.html