Make sure all three servers are on the same network switch, if possible, and that the rsync is done via a seperate network card, this way it won't interfere with internet traffic.
Bear in mind, this way it the whole DC goes down, so does the site. So it might be worthwhile to try and put each server @ a different DC, but on at least a 100Mbps NIC + switch. I know some hosting providers (Softlayer / Rackspace? I can't remember which other does) offers what you want as a standard service, so it might be worthwhile looking into
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