Date: Fri, 8 Sep 2000 15:10:03 -0700 (PDT) From: "Chris D. Faulhaber" <jedgar@fxp.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/21139: IBM DNES drives need 'quirk table' entry. Message-ID: <200009082210.PAA58785@freefall.freebsd.org>
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The following reply was made to PR kern/21139; it has been noted by GNATS.
From: "Chris D. Faulhaber" <jedgar@fxp.org>
To: campt@miralink.com
Cc: freebsd-gnats-submit@FreeBSD.org
Subject: Re: kern/21139: IBM DNES drives need 'quirk table' entry.
Date: Fri, 8 Sep 2000 18:05:07 -0400 (EDT)
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.
-----
Chris D. Faulhaber - jedgar@fxp.org - jedgar@FreeBSD.org
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