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Re: [rdiff-backup-users] rdiff-backup to LinkStation: *slow*
From: |
Chris Wilson |
Subject: |
Re: [rdiff-backup-users] rdiff-backup to LinkStation: *slow* |
Date: |
Fri, 26 May 2006 09:51:33 +0000 (GMT) |
Hi Felix,
On Fri, 26 May 2006, Felix E. Klee wrote:
that would be your problem.
i bet its cpu bound
I'll try turning off compression. Perhaps that helps.
According to "top", the "ssh" server "dropbear" seems to be the limiting
factor.
You could try making sure that SSH compression is turned off as well. That
can eat quite a bit of CPU.
You can also change the SSH encryption algorithm on the client host using
the "Ciphers" option in /etc/ssh/ssh_config. According to this page,
arcfour is faster [http://www.hlrn.de/doc/ssh/index.html]. See the man
page for ssh_config for details.
There's an alternative that I have in mind:
1. Encrypt the data on the client machine.
2. Send it via an unencrypted channel to the LinkStation.
3. Leave it on the LinkStation in an encrypted state. This has a huge
advantage: I could easily transfer the data from the LinkStation to an
Internet backup site, where I definitely don't want it to be stored
unencrypted.
Would this be possible with rdiffbackup? If not, what software solution
should I look into? There surely are some, offered by providers of
remote backups.
I don't think it's possible with rdiff-backup. You could try Box Backup,
which does encrypt data on the client, and is intended to run on low-spec
devices like the LinkStation. Currently it does encrypt the comms channel
as well, but I'm sure the developers would be sympathetic to providing an
option to disable this (I'm one of them).
Cheers, Chris.
--
_ ___ __ _
/ __/ / ,__(_)_ | Chris Wilson <0000 at qwirx.com> - Cambs UK |
/ (_/ ,\/ _/ /_ \ | Security/C/C++/Java/Perl/SQL/HTML Developer |
\ _/_/_/_//_/___/ | We are GNU-free your mind-and your software |
Re: [rdiff-backup-users] rdiff-backup to LinkStation: *slow*, Felix E. Klee, 2006/05/31