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Date: Tue, 15 Dec 1998 08:30:01 -0800 (PST)
Message-Id: <199812151630.IAA11034@freefall.freebsd.org>
To: freebsd-bugs@FreeBSD.ORG
From: "Kenneth D. Merry" <ken@plutotech.com>
Subject: Re: kern/9092: DELF raid volumes cause panics under CAM
Reply-To: "Kenneth D. Merry" <ken@plutotech.com>
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The following reply was made to PR kern/9092; it has been noted by GNATS.

From: "Kenneth D. Merry" <ken@plutotech.com>
To: geoffb@demon.net
Cc: freebsd-gnats-submit@FreeBSD.ORG
Subject: Re: kern/9092: DELF raid volumes cause panics under CAM
Date: Tue, 15 Dec 1998 09:22:44 -0700 (MST)

 geoffb@demon.net wrote...
 > 
 > >Number:         9092
 > >Category:       kern
 > >Synopsis:       DELF raid volumes cause panics under CAM
 > >Confidential:   no
 > >Severity:       non-critical
 > >Priority:       low
 > >Responsible:    freebsd-bugs
 > >State:          open
 > >Quarter:
 > >Keywords:
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Tue Dec 15 06:10:01 PST 1998
 > >Last-Modified:
 > >Originator:     Geoff Buckingham
 > >Organization:
 > Demon Internet
 > >Release:        3.0-RELEASE
 > >Environment:
 > FreeBSD prometheus.noc.demon.net 3.0-RELEASE FreeBSD 3.0-RELEASE #3: Tue Dec 15 10:43:17 GMT 1998
 > >Description:
 > Compuer Associated DELFRaid Logical volumes do not interact correctly
 > with CAM, the proper level of TAG command queing is not reached. (The
 > volumes are nominally capable of queing 32, CAM only gets down to 64
 > many SCSI errors plus kernel panics result.
 > 
 > With maxtags set to 32 as detailed they tend to reduce to 26 or 24 still
 > :-(
 > 
 > >How-To-Repeat:
 > Buy a DELF raid unit and exercise it:
 > 
 > bonnie -s 1000 will allways panic my system.
 > 
 > >Fix:
 > Add the following  to cam_xpt.c
 
 [ ... ]
 
 I'm glad you were able to work around the problem, but if you're getting
 kernel panics, that indicates a problem that may still exist in -current.
 
 Can you provide a stack trace from the panic?
 
 What sort of SCSI errors did you see?
 
 Ken
 -- 
 Kenneth Merry
 ken@plutotech.com

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