Re: aic7xx system hangs

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On Fri, 2004-09-10 at 11:46, Jeremy Conlin wrote:
> Unfortunately, my SCSI devices are 3 hard drives, a CD-ROM and a tape 
> drive.  I tried to boot without the CD-ROM and tape drive, but that 
> didn't work.  Of course I couldn't boot without the hard drives.
> 
> Jeremy
> 

If you have improper scsi termination this can occur.  Newer drivers are
less fault tolerant (also known as more rule enforcing :-) ).

On a scsi bus you are required to have exactly 2 termination points.
These are (usually) the adapter (self terminated) and the device at the
furthest end of the cable (either a device or a terminator on the cable
itself)

If you have more terminators, (or less,) the driver will be unable to
identify attached devices and will often hang as a result.

A second common cause of this is having more than one device with the
same scsi ID, but your description implies this was working previously,
so I do not think this wold be the reason.

> 
> On Sep 9, 2004, at 5:33 PM, Timothy Murphy wrote:
> 
> > Jeremy Conlin wrote:
> >
> >> I recently installed Fedora Core 2 on a Dell PowerEdge 2400 server 
> >> that
> >> previously ran Red Hat 9.  The installation appears to proceed
> >> normally.  The problem is it never boots entirely.  It hangs with the
> >> following as the last message (after removing quiet mode):
> >>
> >> Loading sd_mod.ko module
> >> Loading aic7xxx.ko module
> >>
> >> So I think this might be related to the SCSI adapter(s) I have in the
> >> machine.  I have searched far and wide on this great world wide web of
> >> ours and have found many issues that seem related.  I have even posted
> >> messages on this mailing list when I thought it was a different
> >> problem.  I am starting a new thread with a (hopefully) clearer
> >> subject.
> >
> > Is the SCSI device your main disk, or is it inessential?
> > I'm no guru, but if I had this error I would try the following:
> >
> > (1) Try booting with "linux noprobe".
> >
> > (2) Try adding scsi_adapter=off to /etc/modprobe.conf
> >
> > (3) Try moving the aic7xxx entries from /lib/modules/<kernel version>
> >
> > (3) Try booting with "linux pci=off"
> >
> > (4) If the SCSI device is inessential, remove the SCSI card
> >
> > If you get the machine to boot, I would re-compile the kernel,
> > perhaps with the SCSI driver in the kernel proper rather than a module.
> >
> >
> >
> >
> > -- 
> > Timothy Murphy
> > e-mail (<80k only): tim /at/ birdsnest.maths.tcd.ie
> > tel: +353-86-2336090, +353-1-2842366
> > s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland
> >
> >
> > -- 
> > fedora-list mailing list
> > fedora-list@xxxxxxxxxx
> > To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list
> >
> >
> 



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