I regulary backup my computer to my BananaPi with a Hard Disk connected. The Problem is, that the transfer speed over ssh is pretty low because the Pi can't handle AES 256 encryption quick enough. Since this is a save LAN, I'd like to lower the encryption strength to get higher datarates. Preferably only sometimes, because when I administrate things, I would feel better with a higher encryption.

  • It is unclear that lowering encryptin will accelerate backup. bottleneck more likely located with disk I/O. However, you can try to reactivate remsh (remote shell, aka rsh, port 23) of old, for testing purpose. – Archemar Apr 16 '16 at 7:40
  • it's definitely not disk I/O since pv /dev/zero > x.bin gives me arount 39 MB/s while over ssh I only get 15 – Eddynand Fuchs Apr 16 '16 at 7:42
  • You should rather consider setting up some FTP server. If you are running over trusted LAN, I don't think encryption is needed. – Jakuje Apr 16 '16 at 8:55
  • You could use rsync in its daemon mode where it can use a direct tcp connection with optional compression. – meuh Apr 16 '16 at 9:46

You might have some luck trying different values of the Ciphers option in your ssh_config. Additionally try reducing or disabling compression if your network connection is fast enough to cope to take some extra load off the CPU.

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