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To: Ben Jackson <bjj@sequent.com>
cc: hackers@FreeBSD.org
Subject: Re: buggy 2940 driver? 
In-reply-to: Your message of "Thu, 04 Jan 1996 16:47:23 PST."
             <199601050047.QAA02879@eng4.sequent.com> 
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Date: Thu, 04 Jan 1996 18:28:07 -0800
From: "Amancio Hasty Jr." <hasty@rah.star-gate.com>
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Hi Ben,

My problem is more less  when my Quatum 2100 gets heavy i/o 9 out 
of 10 the system freezes shortly after the heavy i/o activity.

I would try different scsi cables and maybe even get an active terminator
for your setup.

	Cheers,
	Amancio


>>> Ben Jackson said:
 > In message <199601042133.NAA00496@rah.star-gate.com> , you wrote:
 > > For a while now , I have been experiencing system freezes due to 
 > > the 2940 controller. The thing is before I upgraded to 2.1-stable
 > > a while ago the system ran fine.
 > > 
 > > It seems that sometimes under heavy disk i/o activity my 2940 goes
 > > into this reset mode [...]
 > 
 > I have a 2940 connected to (among other things) a QUPD1800S.  During
 > extended periods of heavy read activity (ie backups) the device and/or
 > card will eventually hang, leaving the machine hung (there's a swap
 > partition on that disk).  The tape drive is on another SCSI controller,
 > so it's not the problem.  I have had varying success avoiding the problem
 > by running backups from a vt while the machine is otherwise idle, but
 > sometimes it hangs anyway.
 > 
 > After the hang the 2940 access light is on solid, as is the light on
 > the drive.  I have upgraded to latest greatest drivers several times,
 > since each has held the promise of more and smarter bus reset code, to
 > no avail.  I don't have another similar drive to experiment with, but
 > on my AHA1542Cf this same drive had no problems.
 > 
 > --Ben