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Re: copying a file system across the network

on Tue, Jan 02, 2001 at 05:04:13AM -0900, Ethan Benson (erbenson@alaska.net) wrote:
> On Tue, Jan 02, 2001 at 08:27:05AM -0500, David B. Harris wrote:


> here is a fun trick:
> tar cf - / | ssh -C host 'cd /mnt; tar -xf -'
> ssh -C enables compression which is think is default anyway.  gzipping
> before going over ssh compression is redunant and unlikely to gain all
> that much.  

<g>  I also like piping through ssh.  Versatile.

WRT compression:  data compression works by reducing the redundancy in
data.  Given a pefect compression algorithm, there is no redundancy
left.  Actual algorithm's aren't perfect, but they're generally close.
So, compressing compressed data is a waste of cycles.

Doesn't particularly matter where you put the compression stage, though
if you let ssh compress, the decompression is handled automagically on
the receiving end.

Karsten M. Self <kmself@ix.netcom.com>    http://kmself.home.netcom.com/
 Evangelist, Zelerate, Inc.                      http://www.zelerate.org
  What part of "Gestalt" don't you understand?      There is no K5 cabal
   http://gestalt-system.sourceforge.net/        http://www.kuro5hin.org

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