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Re: cdrom

To: Ulf Carlsson <grim@zigzegv.ml.org>
Subject: Re: cdrom
From: Alex deVries <adevries@engsoc.carleton.ca>
Date: Tue, 1 Sep 1998 14:05:23 -0400 (EDT)
Cc: ralf@uni-koblenz.de, Thomas Bogendoerfer <tsbogend@alpha.franken.de>, linux@cthulhu.engr.sgi.com
In-reply-to: <Pine.LNX.3.96.980901193416.17758A-100000@calypso.saturn>
Sender: owner-linux@cthulhu.engr.sgi.com

Not to be a whiner, but I've *always* had a problem with accessing more
than one SCSI device at a time, both with a CDROM and a hard disk.

- Alex


-- 
Alex deVries, puffin on LinuxNet.
http://www.engsoc.carleton.ca/~adevries/ .



On Tue, 1 Sep 1998, Ulf Carlsson wrote:

> Date: Tue, 1 Sep 1998 19:50:46 +0200 (CEST)
> From: Ulf Carlsson <grim@zigzegv.ml.org>
> To: ralf@uni-koblenz.de
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
>     linux@cthulhu.engr.sgi.com
> Subject: Re: cdrom
> 
> On Tue, 1 Sep 1998 ralf@uni-koblenz.de wrote:
> 
> > On Tue, Sep 01, 1998 at 12:19:11AM +0200, Thomas Bogendoerfer wrote:
> > 
> > The problems seems to be associated with either sync SCSI or disconnect/
> > reconnect.  I did a two line modification to sgiwd93.c which disables
> > sync and disconnect/reconnect.  I now have since about a hour running:
> > 
> >   dd if=/dev/sda of=/dev/zero &
> >   dd if=/dev/sdb of=/dev/zero &
> >   dd if=/dev/sdc of=/dev/zero &
> >   find / /ext -xdev | cpio -o -H crc -F /dev/nst0 --verbose
> > 
> > No problem so far.  (Except that SCSI performance even with only single
> > disk activity is further converging to zero ...)
> 
> I tried to implement your ideas, I disabled sync, I don't know how you
> disable disconnect/reconnect. Anyway, I don't think that's the problem.
> The problem is the sigsegv in mount the oops causes, do we have something
> like a 'half' mounted device?
> 
> Unable to handle kernel paging request at virtual address 00000000, epc ==
> 88021bcc, ra == 8809414
> Oops: 0000
> ...
> epc   : 88021bcc
> Status: 3004fc02
> Cause : 00000008
> Segmentation fault
> 
> I get those other messages ...
> 
> scsi: aborting command due to timeout ...
> 
> ...  when I try to access the directory where I mounted the CDROM drive.
> Do you think my SC hack is causing this mess?
> 
> - Ulf
> 


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