Re: ide-scsi with 2 drives
From: Greg Madden (gomadtroll_at_gci.net)
Date: 12/30/04
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To: debian-user@lists.debian.org Date: Wed, 29 Dec 2004 22:10:59 -0900
On Wednesday 29 December 2004 09:31 pm, Robert Epprecht wrote:
> Ron Johnson <ron.l.johnson@cox.net> writes:
> > On Wed, 2004-12-29 at 12:38 -0900, Greg Madden wrote:
> >> On Wednesday 29 December 2004 10:35 am, Robert Epprecht wrote:
> >> > Up to now I had one hd and one dvd writer and everything worked
> >> > fine. Now I have added a second hd and a dvd rom drive:
> >> >
> >> > /dev/hda hd
> >> > /dev/hdb dvd writer
> >> > /dev/hdc hd
> >> > /dev/hdd dvd rom
> >> >
> >> > A short test with another OS (no, it's debian woody ;-) without
> >> > ide-scsi seems to do fine with all of them.
> >> >
> >> > The trouble starts when I want to use ide-scsi to burn cds or
> >> > dvds. This time I boot sid (but I don't think this makes the
> >> > difference) with 'hdb=ide-scsi' as kernel parameter in grub
> >> > menu.lst (it's a 2.4.24 kernel). I can mount the dvd writer as
> >> > /dev/scd0, but I cannot mount /dev/hdd. I tried /dev/scd1, which
> >> > (to my big surprise) mounts the same drive as /dev/scd0.
> >> >
> >> > I have tried appending 'hdb=ide-scsi hdd=ide-scsi' as kernel
> >> > parameters, and a couple of other things, but had no success
> >> > yet. I must be doing something wrong...
> >>
> >> I have found mixing hd's & cd'd on the same IDE controller to
> >> cause issues. I have even had issues with the position of the
> >> drives on the ribbon cable, depending on the UDMA number of the
> >> device. I would start with hd's on one cable & cd/dvd's on the
> >> other. Make sure your chipset is supported by kernel. This may be
> >> old info as I have been running scsi mostly.
>
> I'm still hoping someone tells me this *is* old info...
>
> > But then performance will take a hit.
>
> That's the point. This computer is used as an audio workstation, so
> hd performance is very important. I don't care about performance
> of the optical drives, that's why I did put the hd's as masters
> on both channels.
>
> > OP could run a 2.6 kernel and not use ide-scsi.
>
> hmm...
>
> > ide-cd works fine for me...
>
> It always did for me, only this time I can't make it work.
> Do you mix hds and cd/dvd drives on the same ide channel?
>
> How can I tell the kernel/module that hdd should *not* be under
> ide-scsi? Or how can I tell ide-scsi that hdd is not the same drive
> as hdb?
I think the easiest thing to do is use a 2.6 kernel, and I would use
'hdparm' and test different arrangements of hd's and cd's. This way you
can see if DMA or other options are working and in which configurations
the drives work best.
-- Greg C. Madden -- To UNSUBSCRIBE, email to debian-user-REQUEST@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
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