Matt McCutchen (m...@mattmccutchen.net) wrote on 17 May 2011 12:50: >On Tue, 2011-05-17 at 08:45 -0700, cac...@quantum-sci.com wrote: >> The connexion is Gb enet end-to-end, and is running at only 40Mb/s. >> It has far more capacity than that. The only limiting factor I can >> see is on the backup server one core of the CPU is running 100% rsync. >> Clearly rsync is not multi-threaded. > >That's probably the delta-transfer algorithm.
Yes. And what's important is not the net flux, it's the transfer rate, which can be a lot higher if there are few changes. You might want to check the read rate at the server, it should be in the hundreds of MB/s. If not rsync got stuck somewhere. Multi-threading rsync is of little use because the the bottleneck will be the disk IO. -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html