What about testing the speed over the ssh tunnel? That may tell you whether ssh is slowing down your transfers or that it's due to rsync. If it is ssh, you could trade encryption strength for speed.

Best,
Koen

On October 16, 2014 2:25:53 PM CEST, Sorin Srbu <Sorin.Srbu AT orgfarm.uu DOT se> wrote:

Hi all,

I'm seeing network speeds at about 35-45 Mbps when using BackupPC and rsync over ssh.

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.

[root@titan ~]# iperf -c cyndane

Client connecting to cyndane, TCP port 5001
TCP window size: 42.5 KByte (default)

[  3] local 192.168.0.8 port 51754 connected with 192.168.0.9 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   398 MBytes   334 Mbits/sec
[root@titan ~]#

Just to clarify, titan above is the BPC-server and has some local disk space where the backup pool is. Cyndane is the host being backed up. Both have gigabit-NIC's and a ditto switch between them.

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? 
Has anybody on this list maybe set up their systems using NFS and can share their experience?

Thanks.

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