How to avoid the Load in rsync with ssh?

Question

I having an large amount of data (300GB) in an Linux server. Now, i want to transfer to another Linux server using the rsync over ssh. When i transferring the data it creating huge load in the server. May i know how to avoid the load in the server when transferring huge amount of data over ssh?

Answer 1

Use a weaker ssh cipher, (e.g. arcfour) like this:

rsync -av source --rsh="ssh -c arcfour" foo@bar:/destination

There might be even weaker ciphers, but arcfour is my preferred one, since it's not the best trade-off between security and speed (in my case, search for cipher benchmarks, there are many around).
Or don't use ssh at all and run a rsync daemon on the destination server.

Answer 2

I found the solution to avoid the load in the server during the file between remote and local server by including ionice and nice command in rsync

ionice - get/set program io scheduling class and priority

nice - run a program with modified scheduling priority

#rsync -r -az --rsync-path="ionice -c 3 nice rsync" -e "ssh -p 8363" username@ip-address:/source-file  /destination

Answer 3

Or, if the load you're concerned with is CPU load and you have modern CPU with AES instructions (though it seems unlikely from your description), you can use Intel Accelerator Engine. There's README inside with info on how to set it up. There also may be some distro-related way how to set it up.

To see if you have 'modern' CPU, use grep aes /proc/cpuinfo.