Frederic,

What are the tuning parameters ?

Are you bumping into an amanda imposed bandwidth limit ?
What are the settings for max dumpers and number of jobs
you can run at one time for each client ?
What level of SW compression are you using ?


On Fri, Jul 09, 2004 at 10:22:46AM -0400, Joshua Baker-LePain wrote:
> 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
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