Date: Fri, 8 Sep 2000 15:10:05 -0700 (PDT) From: Tracy Camp <campt@thalvors.miralink.com> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/21139: IBM DNES drives need 'quirk table' entry. Message-ID: <200009082210.PAA58798@freefall.freebsd.org>
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The following reply was made to PR kern/21139; it has been noted by GNATS.
From: Tracy Camp <campt@thalvors.miralink.com>
To: "Chris D. Faulhaber" <jedgar@fxp.org>
Cc: freebsd-gnats-submit@FreeBSD.org
Subject: Re: kern/21139: IBM DNES drives need 'quirk table' entry.
Date: Fri, 8 Sep 2000 15:08:11 -0700 (PDT)
On Fri, 8 Sep 2000, Chris D. Faulhaber wrote:
> On Fri, 8 Sep 2000 campt@miralink.com wrote:
>
> > IBM DNES drives do not support more than 64 tagged queued commands and
> > the default settings for maxtags is 255 which is problematic. Under heavy
> > write loads this leads to a system crash.
> > >How-To-Repeat:
> > Install a DNES drive and perform disk operations.
> > >Fix:
> > Add quirk entry in cam/cam_xpt.c for this drive (see below) that limits maxtags to 32.
> >
> > {
> > /* DNES docs state on page 203 that this device only
> > * supports 64 queued commands. 9gig and 18gig devices P/N
> > * DNES-318350 and DNES-309170. campt@miralink.com
> > */
> > { T_DIRECT, SIP_MEDIA_FIXED, "IBM", "DNES*","*"},
> > /*quirks*/0, */mintags*/2,/*maxtags*/32
> > }
> >
>
> Beware, the above entry also encompasses this drive:
>
> da0: <IBM DNES-309170W SA30> Fixed Direct Access SCSI-3 device
>
> which works fine without the entry.
Just read what they tell me in the docs. I've been using the DNES-309170W
SA30 and see the problem, there is also a 309170W with a diffrent firmware
that has the same behavior. I turned off tagged queueing alltogether in
my application and got much improved stability so I'm at least convinced
its necissary, but hey - your call. :)
The manual refrenced is a nice 230 some page pdf available from
IBM. Maybe I've misread it.
t.
>
> -----
> Chris D. Faulhaber - jedgar@fxp.org - jedgar@FreeBSD.org
> --------------------------------------------------------
> FreeBSD: The Power To Serve - http://www.FreeBSD.org
>
>
Tracy Camp
Product Development
Miralink Corp.PDX
Portland OR
503-223-3140
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