On Thu, Oct 16, 2014 at 7:25 AM, Sorin Srbu <sorin.s...@orgfarm.uu.se> wrote: > > I'm seeing network speeds at about 35-45 Mbps when using BackupPC and rsync > over ssh. >
That sounds pretty good. But unless you have a lot of new files created daily, the bottleneck is usually disk speed, especially merging a lot of small changes into a big existing file. > Running iperf below I notice the network should theoretically be capable of a > bit more than that. I understand that ssh adds quite a bit of bottleneck. There is some overhead for encryption. Back when cpus were slow enough for it to matter I used to set blowfish as the preferred cipher. Now you probably want aes-128 where you have hardware support. > > After reading one of the answers at > <<http://serverfault.com/questions/377598/why-is-my-rsync-so-slow>>, I kinda' > wonder if the NFS-angle would work for use with BackupPC and how I would go > about it. Is the tar transfer method the only one supported by BPC if using > NFS for example? > Rsyncing a NFS-mounted remote host supposedly is a lot faster than doing > rsync over ssh. > > Any thoughts on this? I'd guess there are too many variables to predict but I'd stick to ssh because of the forced validation (--ignore-times) on full runs. In the case that will ultimately matter the most (the third and subsequent full runs) you can avoid most of the server-side reads if you used checksum caching but you still have to perform a full read of the content on the client side. With ssh, that's a local disk access. with nfs you'll copy every file across the network just so rsync can compute its block checksum even where everything already matches. -- Les Mikesell lesmikes...@gmail.com ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for $9/Month. Get alerted through email, SMS, voice calls or mobile push notifications. Take corrective actions from your mobile device. http://p.sf.net/sfu/Zoho _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
