[paranoia] SCSI CD Problems - a workaround solution

[Jack Pistachio]

Sounds like you didn't have the generic scsi device nodes
setup.  Create these using mknod (major=21, minor=X where X
is sgX). 
bash$ mknod sgX c 21 X
In your case, you need sg0 to use scd0.  CDParanoia works
fine with scsi emulation, in fact it suggests it.  scsi
emulation is also required for CD burning.  The reason most
programs will work with the setup you had before is they
don't use the generic device, while CDParanoia makes quite
a bit of use with it.
-jackp

<p>--- Lindsay Haisley <fmouse at fmp.com> wrote:
> I worked around the problem.  It turns out that the drive
> isn't a SCSI CD,
> but an IDE CD mapped to a SCSI drive by the kernel with
> ide-scsi.o.
> 
> /dev/cdrom was a symlink to /dev/cdrom0 which was a
> symlink to /dev/scd0. 
> This is set up by the discover program, which I
> apparently loaded or updated
> on my system within the past few months.  discover
> decides to use the
> ide-scsi module and set the drive up as a SCSI drive on
> the basis of the
> module being available.  Apparently cdparanoia doesn't
> deal gracefully with
> a virtual SCSI CD set up by the kernel.  Don't know if
> this is a kernel
> problem or a cdparanoia problem.  I don't need the
> ide-scsi module and it
> was not previously loaded.
> 
> The problem can be band-aided by excluding ide-scsi from
> management by
> discover by including the following line in
> /etc/discover.conf
> 
> skip ide-scsi
> 
> discover will set up the first link noted above, but
> dev/cdrom0 will be a
> symlink to /dev/hdx (x is the CD drive IDE sequence
> number) instead of
> /dev/scdx and ide-scsi won't be loaded by default.
> 
> The ide-scsi module (or compiled kernel facility) is
> needed for cdrecord, I
> understand, so this might present an issue for some
> people, requiring
> dynamic loading and unloading of the module.  As noted in
> my original post,
> other programs deal well enough with the CD drive as a
> virtual SCSI device,
> but cdparanoia doesn't, so this is apparently someone's
> bug, either the
> kernel developers or the cdparanoia developers.
> 
> 
> Thus spake Lindsay Haisley on Wed, Feb 12, 2003 at
> 03:16:48PM CST
> > I have a system here with a SCSI CDROM that used to
> work fine with
> > cdparanoia.  For some reason it's stopped working,
> possibly as a result of a
> > kernel upgrade, but really I have no way of telling. 
> Nothing else has
> > really changed on the system which might affect this,
> as far as I can tell.
> > 
> > $ cdparanoia -v -d /dev/scd0 1 /tmp/foo
> > cdparanoia III release 9.7 (December 13, 1999)
> > (C) 1999 Monty <monty at xiph.org> and Xiphophorus
> > 
> > Report bugs to paranoia at xiph.org
> > http://www.xiph.org/paranoia/
> > 
> > Checking /dev/scd0 for cdrom...
> >         Testing /dev/scd0 for cooked ioctl() interface
> >                 /dev/scd0 is not a cooked ioctl CDROM.
> >         Testing /dev/scd0 for SCSI interface
> >                 No generic SCSI device found to match
> CDROM device /dev/scd0
> > 
> > (same thing happens with release 9.8)
> > 
> > $ xmcd -dev /dev/scd0
> > 
> > ... works as expected and plays CDs, so the CD drive
> works OK.
> > 
> > xmms will also play CD tracks, and it also works
> properly.
> > 
> > I'm running Debian GNU/Linux with Linux kernel 2.4.20. 
> Kernel modules
> > sr_mod.o and cdrom.o are loaded.
> > 
> > I use cdparanoia with mp3c for my business, and have a
> customer waiting for
> > me to generate mp3 files from a CD she sent me.  Any
> help with this problem
> > would be greatly appreciated!
> > 
> > -- 
> > Lindsay Haisley       | "Everything works    |     PGP
> public key
> > FMP Computer Services |       if you let it" |     
> available at
> > 512-259-1190          |    (The Roadie)      |
> <http://www.fmp.com/pubkeys>
> > http://www.fmp.com    |                      |
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> -- 
> Lindsay Haisley       | "Everything works    |     PGP
> public key
> FMP Computer Services |       if you let it" |     
> available at
> 512-259-1190          |    (The Roadie)      |
> <http://www.fmp.com/pubkeys>
> http://www.fmp.com    |                      |
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