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

[Götz Reinicke]

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