How to tune rsync to speed up?

[Perry Hutchison]

Sebastian G??decke via rsync <rsync at lists.samba.org> wrote:

> We're facing some flapping traffic when rsyncing atm 70T from
> one server to an DELL Isilon.
> Both systems are connected with 10G Fiber (not Channel).
> So we started with one simple "rsync -a /src /dest" to the DELL
> by using NFS3.
> ...
> I always thought (and had observed it so far with rsync) that it
> makes full use of the network card ...

If you are using NFS, it is NFS -- not rsync -- which is managing the
network traffic.  In such a setup rsync will perform about as well as
cp(1).