From owner-freebsd-questions  Tue Jan  9 17:57:35 1996
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From: Peter Dufault <dufault@hda.com>
Message-Id: <199601100159.UAA27646@hda.com>
Subject: Re: A few questions
To: chuck@fang.cs.sunyit.edu
Date: Tue, 9 Jan 1996 20:59:36 -0500 (EST)
Cc: urcf@fang.cs.sunyit.edu, questions@freebsd.org, hackers@freebsd.org
In-Reply-To: <199601092134.QAA20547@fang.cs.sunyit.edu> from "chuck@fang.cs.sunyit.edu" at Jan 9, 96 04:34:04 pm
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> 
> On Jan 9,  1:35pm, "Rodney C. Forbes" wrote:
> } Subject: A few questions
> } 3. I recently installed a Nakamichi 7 disk CD-ROM changer.  What is the current
> } 	status concerning reports of panics while using this drive.  Are there
> } 	any patches I should be aware of?
> 
> 	I too recently purchased one of these drives (I haven't recieved it
> yet though). I'm concerned about the possibility of panics and wonder how
> FreeBSD will handle multiple access attempts to different LUNs. Has any-
> one had any success/failure in these areas?

There was a bug in the multi CD code recently fixed in cd.c.  It was
(from memory here...)

> if(cd->dkunit >= 0) {

instead of:

> if(cd->dkunit) {

since cd->dkunit is set to -1 when dk_ndrive > DK_NDRIVE.

With this fixed the code seemed to work well, accessing 7
disks continuously over a 12 hour period.

--

Peter Dufault               Real Time Machine Control and Simulation
HD Associates, Inc.         Voice: 508 433 6936
dufault@hda.com             Fax:   508 433 5267