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 deVries, puffin on LinuxNet.
On Tue, 1 Sep 1998, Ulf Carlsson wrote:
> Date: Tue, 1 Sep 1998 19:50:46 +0200 (CEST)
> From: Ulf Carlsson <email@example.com>
> To: firstname.lastname@example.org
> Cc: Thomas Bogendoerfer <email@example.com>,
> Subject: Re: cdrom
> On Tue, 1 Sep 1998 firstname.lastname@example.org 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