*BSD News Article 60608


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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: One more try... CD-R writing from FreeBSD
Date: 26 Jan 1996 23:25:39 GMT
Organization: Private BSD site, Dresden
Lines: 37
Message-ID: <4ebntj$ke2@uriah.heep.sax.de>
References: <neIKwIf@quack.kfu.com> <DLnEJJ.367@robkaos.ruhr.de> <jlemonDLovJz.J6K@netcom.com>
Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
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jlemon@netcom.com (Jonathan Lemon) writes:

> I'm in the process of setting up a machine just for the purpose of
> archiving and retrieving old reports, so I would really, _REALLY_
> like to see a CDR driver under FreeBSD.

Work in progress.

> The machine in question will have an Adaptec 2940 controller, a
> Yamaha CDR-100 recorder, and the CDROM image will be written from a
> Barracuda disk.  (This should be fast enough to keep up with the
> recording rate, right?)  I would be willing to help test a driver
> after we get the machine (in the next month or so).

You don't really need a fast disk to cope with the sluggish burners.
Double speed is 360 KB/s, so almost any SCSI disk should remain mostly
idle while feeding a CD-R.  The only problem is that the CD-R needs a
constant data flow, and the most dangerous activity is random but
heavy disk load (swap!) happening at the same time where the disk
should better feed the CD-R writing process.  Even raising the
scheduling priority (rtprio(1)) doesn't help here.

You would run best by leaving a single disk just for feeding the CD-R,
and another one for all the rest.  This should even allow you for
running full multi-user.

Sorry, the Yamaha won't be the first CD-R supported by FreeBSD.  This
will most likely be a Plasmon RF4100 (it already sorta works), closely
followed by an HP device (Jordan's already sitting on this one...).
They are both rather similar, while the Yamaha is _vastly_ different.

-- 
cheers, J"org

joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)