From owner-freebsd-scsi  Sat Mar 29 14:17:16 1997
Return-Path: <owner-freebsd-scsi>
Received: (from root@localhost)
          by freefall.freebsd.org (8.8.5/8.8.5) id OAA16638
          for freebsd-scsi-outgoing; Sat, 29 Mar 1997 14:17:16 -0800 (PST)
Received: from darling.cs.umd.edu (darling.cs.umd.edu [128.8.128.115])
          by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id OAA16631
          for <scsi@freebsd.org>; Sat, 29 Mar 1997 14:17:12 -0800 (PST)
Received: by darling.cs.umd.edu (8.8.5/UMIACS-0.9/04-05-88)
	id RAA11285; Sat, 29 Mar 1997 17:16:32 -0500 (EST)
Message-Id: <199703292216.RAA11285@darling.cs.umd.edu>
To: Keith Mitchell <kmitch@weenix.guru.org>
cc: rohit@cs.umd.edu (Rohit Dube), scsi@freebsd.org
Subject: Re: AHA2940 bug(s) still exist in 2.2.1 
In-reply-to: Your message of "Sat, 29 Mar 1997 13:37:28 EST."
             <199703291837.NAA18674@weenix.guru.org> 
Date: Sat, 29 Mar 1997 17:16:31 -0500
From: Rohit Dube <rohit@cs.umd.edu>
Sender: owner-freebsd-scsi@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

On Sat, 29 Mar 1997 13:37:28 -0500 (EST) kmitch@weenix.guru.org writes:
=>> ahc0 <Adaptec 2940 Ultra SCSI host adapter> rev 0 int a irq 11 on pci0:12
=>> ahc0: aic7880 Single Channel, SCSI Id=7, 16 SCBs
=>> ahc0 waiting for scsi devices to settle
=>> (ahc0:0:0): "MICROP 4421-07   0329SJ 0329" type 0 fixed SCSI 2
=>> sd0(ahc0:0:0): Direct-Access 2047MB (4193360 512 byte sectors)
=>
=>Have you tried turning off TAGged command queuing (AHC_TAGENABLE)??
=>
=>I have a 3940UW with a Microp 4221W and I get similar results.  Everything
=>seems ok without tagged command queueing.

Yup. Tagged queuing was turned off. We had problems with the same model 
Controller and Quantum Atlas disks with Tag queuing enabled. Without this
option, the Quantums seem to work fine, but this has no effect on the 
Micropolis disks which continue to crash.

--rohit.