Date: Thu, 20 Sep 2001 12:31:10 -0500 From: David Kelly <dkelly@hiwaay.net> To: "Karel J. Bosschaart" <karelj@wop21.wop.wtb.tue.nl> Cc: questions@FreeBSD.ORG Subject: Re: first CD burner fails while starting second (cdrecord) Message-ID: <20010920123110.B63111@grumpy.dyndns.org> In-Reply-To: <20010920135134.A29683@wop21.wop.wtb.tue.nl>; from karelj@wop21.wop.wtb.tue.nl on Thu, Sep 20, 2001 at 01:51:34PM %2B0200 References: <karelj@wop21.wop.wtb.tue.nl> <200109200227.f8K2RBG59500@grumpy.dyndns.org> <20010920135134.A29683@wop21.wop.wtb.tue.nl>
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On Thu, Sep 20, 2001 at 01:51:34PM +0200, Karel J. Bosschaart wrote: > On Wed, Sep 19, 2001 at 09:27:11PM -0500, David Kelly wrote: > > > > Years ago when I last had an SGI Irix system, cdrecord locked out all > > other I/O and processes for about 10 seconds when it started burning a > > CD. Not the 10 second countdown, but after that. If another cdrecord was > > running on another device I'd bet that device would be starved during > > this period. And that could be what you are seeing. > > > Then I would expect that it also fails when I change the order (start > 0,4,0 while 0,6,0 is burning) but that is not the case. Or maybe that > burner somehow can handle the lockout. I'll try swapping the SCSI id's > and see what happens. They are both on the same SCSI bus but the problem doesn't happen if you start the burns in the other order? The other thing I learned years ago when shopping for a multi-CD duplicator is there was quite a difference in the quality of implementation of the SCSI firmware on various drives. The original $1,000+ Yamaha CDR-100 4x writer was well behaved but later SCSI Yamahas were not. So when the CDR-100 supply dried up the Panasonic 7502 came out of nowhere and was the gang burner champ. Was using a CDR-100 in the Irix system mentioned previously. SCSI scanners are usually poorly behaving as well. Is OK as long as the scanner is the only device on the bus as many don't disconnect while "thinking". Am thinking something similar may be happening with your two different CD-RW drives. When one starts it doesn't free the SCSI bus for a long time when starting. Causes the other to starve for data. Might watch the flashing LED's on the CD-RW drives and the HD (HD on same cable, right?). If my suspicion is right there isn't anything you can do about it other than replace one of the CD-RW drives (I'd like to know which is the problem so to avoid that brand in the future) or place the offending drive on a SCSI controller all to itself. -- David Kelly N4HHE, dkelly@hiwaay.net ===================================================================== The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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