[CentOS] rsync stuck at +- 50 MB/s, cp and scp are +- 200 MB/s

[Jason Warr]

Have you tried starting up an rsync daemon and running it without the ssh overhead? 

I occasionally do rsync over 10g lan and if I don't use a daemon or NFS then arc-four is enough to provide adequate speed.



On August 11, 2015 11:34:48 AM CDT, "Götz Reinicke" <goetz.reinicke at filmakademie.de> wrote:
>Hi,
>
>I tried different encryptions like arc four, but always with the same
>result. BTW: googling shows some similar questions and they are stuck
>on set same speed +-.
>
>But non of that solutions helped me.
>
>	/Götz
>
>
>
>
>> Am 11.08.2015 um 12:14 schrieb Eero Volotinen
><eero.volotinen at iki.fi>:
>> 
>> Usually problem in encryption.
>> 
>> try cipher arcfour or apply hpn patches to ssh.
>(http://www.psc.edu/index.php/hpn-ssh
><http://www.psc.edu/index.php/hpn-ssh>)
>> 
>> --
>> Eero
>> 
>> 2015-08-11 12:37 GMT+03:00 Götz Reinicke - IT Koordinator
><goetz.reinicke at filmakademie.de
><mailto:goetz.reinicke at filmakademie.de>>:
>> Hi,
>> 
>> i have two servers, connected to to the lan by 10Gb with 10Gb and DAS
>> hardware raid.
>> 
>> Each system con read and write locally or to the 10G iscsi by more
>than
>> 200 MB/s.
>> 
>> Now I have to transfer backups form A to B and doing this with rsync
>> always stuck at +- 48-50MB/s no matter which options, compressions,
>> encryption etc I use. Even the plain default rsync is at that 50 Mb
>limit.
>> 
>> coyp by scp goes up to 200 MB/s.
>> 
>> Copy from and to my workstation with scp from or to both servers is
>at
>> 1Gb limit (so +- 100 MB/s)
>> 
>> 
>> Why is rsync stuck at +- 50 MB/s ? Any suggestions hints ...
>> 
>>         Thanks and regards . Götz
>
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