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Definitely see the answers at: Why is my rsync so slow? I've relied on rsync-based solutions for replication and backup for many years. I've never needed to use any form of WAN acceleration (using an appliance). Over the years, my rsync approaches have evolved; from basic compression to using "-e ssh -c arcfour" as a lighter-weight cipher, to using ...


I was initially going to be a naysayer to the idea of trying to "WAN optimize" rsync traffic, but the more I thought about it the more I decided that it was possible. A TCP-based dictionary compressor (which I believe the Riverbed Steelhead appliances can do) would probably benefit an unencrypted rsync stream. Presumably the Riverbed devices can do ...


I assume the increased speed is at least partly due to "rsync src host:/path" spawning a local process on the remote machine for sending/receiving, effectively cutting your I/O in half.

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