Rsync Stuck At +- 50 MB/s, Cp And Scp Are +- 200 MB/s
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
5 thoughts on - Rsync Stuck At +- 50 MB/s, Cp And Scp Are +- 200 MB/s
Usually problem in encryption.
try cipher arcfour or apply hpn patches to ssh. (
http://www.psc.edu/index.php/hpn-ssh)
—
Eero
2015-08-11 12:37 GMT+03:00 Götz Reinicke – IT Koordinator < goetz.reinicke@filmakademie.de>:
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
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.
El 11/08/2015 a las 06:37 a.m., G
You can enable null cipher with hpn patches..
Eero
11.8.2015 7.35 ip. “Götz Reinicke”
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