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Subject: Re: system hangs with umax Astra 1200S / freebsd 
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Date: Sat, 12 Jul 1997 16:04:49 -0700
From: Amancio Hasty <hasty@rah.star-gate.com>
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Move to hackers list from sane mailing list:

Any clues as to what why the 1522 may a cause a system to hang?
Also eric when you get a chance can you try out the "uk" device?


	Tnks,
	Amancio

>From The Desk Of eric :
> On Sat, Jul 12, 1997 at 12:45:36PM -0700, David Mosberger-Tang wrote:
> > 
> > Hmmh, what version of FreeBSD and what SCSI controller are you using?
> > I find it strange that a user-level SCSI program would hang the entire
> > system.  I suppose it might be possible for the scanner to block the
> > SCSI bus if something bad happens, but it should not lock up the
> > entire system.  Hence I wonder whether the problem might be with the
> > generic SCSI driver, rather than the UMAX backend.
> > 
> > 	--david
> 
> 
> This seemed very strange to me too, but apparently the problem has been 
> resolved. 
> 
> First, it wasn't a matter of the scanner blocking the scsi bus -- it had an
> entire scsi bus to itself on an Adaptec 1522 (which turned out to be the
> problem)
> Second, I'm using the "pt" driver, although i suspect the "uk" driver would
> work too now that I've moved the scanner to an Adaptec 2940W. 
> Everything works more or less fine now, except the scanner still needs to be
> the _only_ device on the bus. If I put a disk on the same bus as the scanner,
> (with a different SCSI id# obviously) accesses to the disk time out and stuff
.
> It seems like it may be a termination issue, which I'll fiddle around with
> some more. 
> But anyway, it will not work at all using an AHA1522, with either a Umax or
> an HP4c scanner. 
> 
> Thank's for all the help! 
> 
> 
> 					eric
> 
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