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notice about possible SSH speedups

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Mirek Kratochvil 2016-06-27 13:08:51 +02:00
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README.md
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@ -135,6 +135,26 @@ Check if the environment is the same as when you test the stuff from the command
missing `ssh-agent`, especially the password-protected privkeys. Descriptions
of many workarounds are available around the internet.
#### Backups pulling soo sloowwwwwww!
There are two possible bottlenecks. We cannot actually cure ZFS's internal
`send`/`recv` speed (for that, add a multitude of faster disks and caches), but
we can usually speed up SSH data tranfer a lot. Best advice currently available
is this: https://gist.github.com/KartikTalwar/4393116
In short, to use the fastest SSH cipher around, add something like this to your
user's SSH config file:
```
Host fill.in.some.host
Ciphers arcfour
```
Make sure that you understand possible security and compatibility implications
of this configuration. Specifically, note that some recent SSH installations
disable arcfour-family ciphers completely for a good reason. If you have `aes`
CPU extension, aes128-gcm could work quite fast as well.
## Disclaimer
Be sure to verify that this software really fits your use-case before you use