From 4e2e2f253a3462b227301083b2a4f70ebbf13f7e Mon Sep 17 00:00:00 2001 From: Mirek Kratochvil Date: Mon, 27 Jun 2016 13:08:51 +0200 Subject: [PATCH] notice about possible SSH speedups --- README.md | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/README.md b/README.md index 03e4beb..2a2ae58 100644 --- a/README.md +++ b/README.md @@ -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