[SATLUG] simultaneously burning multiple DVDs

Borries Demeler demeler at biochem.uthscsa.edu
Tue Dec 30 12:09:40 CST 2014


On Tue, Dec 30, 2014 at 12:00:59AM -0600, Brad Knowles wrote:
> On Dec 28, 2014, at 2:58 PM, Borries Demeler <demeler at biochem.uthscsa.edu> wrote:
> 
> > When I said "such an operation produces faulty drives" I meant to say
> > faulty DVDs. Those faulty DVDs were created by running multiple instances
> > of cdrecord, a commandline tool.  All works well when running one copy,
> > but more than one simultaneous burn operation causes the bad DVDs (audio
> > skips, for example). The problem gets worse the higher the number of
> > simultaneous write operations, even when the source iso file is on a
> > ramdrive. Just curious where the bottleneck is and what to do about it.
> 
> I would not be at all surprised if the limitation is in the driver for the DVD-writer.  Those things were written for use in the days when you were lucky to have a single DVD-writer device available, and are most likely not re-entrant and capable of any kind of multi-processing.
> 
> Trying to do more than one thing at a time is probably blowing the mind of the poor little beast.

That's an interesting thought - so the Linux driver for the dvd writer is
used 4 times for 4 different drives and may not be able to feed the data
fast enough to each one?

-b.
> 
> -- 
> Brad Knowles <brad at shub-internet.org>
> LinkedIn Profile: <http://tinyurl.com/y8kpxu>
> 
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