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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!nntp.coast.net!howland.erols.net!news.mathworks.com!uunet!in2.uu.net!158.250.39.26!Gamma.RU!srcc!news.uni-stuttgart.de!news.ruhr-uni-bochum.de!news-koe1.dfn.de!news-han1.dfn.de!news-ham1.dfn.de!news-ber1.dfn.de!zrz.TU-Berlin.DE!news.tu-chemnitz.de!irz401!orion.sax.de!uriah.heep!news From: j@uriah.heep.sax.de (J Wunsch) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: 5-bit limit on SCSI cd devices? Date: 5 Jan 1997 01:26:18 GMT Organization: Private BSD site, Dresden Lines: 27 Message-ID: <5amvvq$q75@uriah.heep.sax.de> References: <E3I9Ln.ExB@sysadm.physics.uiowa.edu> Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) NNTP-Posting-Host: localhost.heep.sax.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: knews 0.9.6 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:33638 ljg@PROBLEM_WITH_INEWS_GATEWAY_FILE (Larry Granroth) wrote: > I would like to hang stacks of cheap SCSI CDROM changers on a FreeBSD 2.2 > box, but there appears to be a limit of 32 device units built into > the cd driver (a 5-bit CDUNIT). No, not into the cd driver, but into the entire system. :( The macro `dkunit' applies this limit. There's no actual limit in the cd driver, so you might get around this by modifying the code. Btw., CD changers aren't working very excellent anyway. I have recently committed a couple of changes that improve the mount behaviour (you should no longer get ENXIO now), but it still tend to thrash if accessing multiple platters from the same drive simultaneously. I've started a discussion about how to avoid this on the freebsd-scsi@freebsd.org list, and Peter Dufault has got an idea. (Said changes are not yet in the 2.2 branch, only in 3.0-current.) -- 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. ;-)