Rsync download traffic

jw schultz jw at
Fri Oct 17 11:55:37 EST 2003

On Thu, Oct 16, 2003 at 01:44:46PM -0500, Max Kipness wrote:
[reformatted, please use shorter lines next time]
> Hello,
> I started monitoring lan traffic with RRDTool on a linux
> box the other day that runs rsync, and I've found what I
> would consider a strange traffic pattern. This linux box
> rsync about 2Gb of data to a local samba share that is
> connected to a Windows 2003 server. Based on the literal
> data stat, roughly 20% is changed nightly and uploaded.
> However, the strange thing is that the traffic monitoring
> shows that there is 3mb/s saturation both ways, upload and
> download (somehow the server only had a 10mb ethernet
> adapter).
> This behavior could not possibly be correct, could it? Or
> is this normal. If needed I can post some stats and
> command line options.

Why couldn't it?  Fast disks and CPU will easily overrun a
10Mb connection for network file service.  Don't forget
3Mb/s is only 300KB/s compared to 5-30MB/s for disks.

Your description leaves a couple of important things out:
version of rsync and how rsync views the transfer with
regard to networking.

Make sure that rsync is doing a --whole-file transfer.
Otherwise it will really thrash the destination.

	J.W. Schultz            Pegasystems Technologies
	email address:		jw at

		Remember Cernan and Schmitt

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