On Fri, 9 Jul 2004 at 9:27am, Frederic Medery wrote

> We have more and more prob with the backup : it takes more then 14 h.
> 
> It's not amanda fault just the amount of data. :-)

How much per night?

> For now we have a backup server with a amanda partition with 18 GB 
> connected to a IBM LTO Ultrium 3581 tape Charger (7 tapes). The Hardware 
> compression is off (sofware compression is used).
> 
> Now we have GB network and faster server with losts of RAM and HD spaces 
> and I want to install Amanda on our prod server which have the largest 
> amount of data.
> 
> so is-ti better (faster backup) to have  :
> hardware or software compression ?
> A larger amanda partition ?
> 
More holding space is going to give you the biggest boost.  Software vs. 
hardware compression with regards to speed depends on your hardware -- if 
the CPUs can compress the data as fast as the disk/network can take it, 
then it isn't going to slow you down.

Also note that, with your LTO drive, you can turn on hardware compression 
*and* use software compression on selected DLEs if you so choose.

-- 
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University