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-   -   scsi emulation or not ? (http://www.linuxquestions.org/questions/slackware-14/scsi-emulation-or-not-121634/)

cozye 12-01-2003 11:17 AM

scsi emulation or not ?
 
Hello,
I have setup scsi emulation on my cd drive initially to use cdrecord, but through the process I realized that I did not have to use scsi emulation.

Should I stop using scsi emulation ? I occasionally burn some discs, and do a little ripping from time to time. Which is better, the default ide/atapi, or scsi emulation ?

tipaul 12-01-2003 11:50 AM

scsi or not scsi?
 
I always had the same question...

But I always used scsi emulation since some burning apps won't use the reader if not configured as scsi......

And no, I never saw any speed improvement when using no scsi-emulation...

;)

murray_linux 12-01-2003 12:16 PM

I use k3b as a frontend for CD burning, which uses cdrdao. When I wasn't using scsi-emulation it gave me an error message, that cdrdao doesn't support atapi devices, that i would have to get the cvs version for that. When i enabled scsi emulation (much simplier then I imagined), the errors went away.

Hope that helps.

Murray

J.W. 12-01-2003 12:37 PM

For me, I was having trouble burning CD's until I included scsi emulation, which fixed the problem. I'd say that if your system already works fine without it, there's no reason to put it in (for the simple reason that, well, it's already working the way you want it to work) -- J.W.

tobyl 12-01-2003 02:17 PM

I have also questioned this.
From the file README.atapi (xcdroast 0.98alpha-14 docs):

Please note that this is usally not required anymore [scsi emulation], as X-CD-Roast now
supports ATAPI devices directly. But using the direct ATAPI support
causes a lot of problems. Accessing devices takes a much longer time
and there is no DMA support, which will result in big CPU problems.

Well, this is from someone who I guess knows what he is saying.

I think scsi emulation will be obsolete in the 2.6 kernel when it is ready, but I reckon its stick with
append="hdx=ide-scsi" for now...

tobyl

cozye 12-01-2003 02:23 PM

Great input from everyone. Nice post tobyl. I think I will just keep using scsi emulation for now.


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