Re: [BackupPC-users] Using NFS to increase backup speed
2014-10-17 15:51:28
On 10/17/2014 09:40 AM, Sorin Srbu wrote:
>> 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.
> Would the below do?
>
> [root@cyndane ~]# yes | pv | ssh titan "cat > /dev/null"
> 1.16GiB 0:01:29 [14.3MiB/s]
>
> [root@cyndane ~]#
>
> I searched and read som more after posting the question, and I realize it's
> not that simple fixing this, as I initially thought...
I'd tunnel the port your use for iperf (ssh -L 5001:localhost:5001
cyndane) and run the same test as you initially did (iperf -c
localhost). I expect that you'll see a value that's larger than the
35-45 Mbps you get for rsync+ssh, meaning that rsync is the bottleneck.
And most of the time, that makes sense, because it's often doing other
things than transferring data.
Best,
Koen
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