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Date:      Fri, 8 Sep 2000 15:40:02 -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:  <200009082240.PAA61976@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: "Justin T. Gibbs" <gibbs@plutotech.com>
Cc: freebsd-gnats-submit@FreeBSD.ORG
Subject: Re: kern/21139: IBM DNES drives need 'quirk table' entry. 
Date: Fri, 8 Sep 2000 15:34:24 -0700 (PDT)

 On Fri, 8 Sep 2000, Justin T. Gibbs 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.
 > 
 > The problem here is the system crash, not that the table starts
 > out your drive with a tag count of 255.  CAM should automatically
 > reduce the count to the maximum supported by the device.  Can
 > you give some details about the panic you are seeing?
 A message along the lines of :
 
 (da2:ahc0:0:3:0): tagged openings now 64
 
 Followed shortly thereafter by a system freeze/hang.  Perhaps the word
 'crash' was used too quickly here.  What seems to be happening is that the
 drive stops responding which effectively is a 'crash' from my
 standpoint.  Its been awhile since we dealt with this actually and I just
 now thought about reporting this back.  Sorry if this isn't much use, I
 don't do kernel stuff normally but am one of the few that can work in C at
 all here.
 
 
 Tracy Camp
 Product Development
 Miralink Corp.PDX
 Portland OR
 503-223-3140
 
 
 
 


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