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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!nntp.coast.net!news.kei.com!news.mathworks.com!fu-berlin.de!zib-berlin.de!news.tu-chemnitz.de!irz401!uriah.heep!news From: j@uriah.heep.sax.de (J Wunsch) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: tpqic02... Date: 23 Dec 1995 15:04:34 GMT Organization: Private BSD site, Dresden Lines: 31 Message-ID: <4bh5q2$naq@uriah.heep.sax.de> References: <4a6vve$l46@senator-bedfellow.mit.edu> <RDONG.95Dec8133059@chow.uci.edu> <RDONG.95Dec11113515@chow.mat.jhu.edu> <4anj90$mqa@uriah.heep.sax.de> <DJo68z.7qH@citylink.dinoex.sub.org> <4b79de$52i@uriah.heep.sax.de> <DJzs44.Ets@citylink.dinoex.sub.org> 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 0.9.3 peter@citylink.dinoex.sub.org (Peter Much) writes: > Interim, I have been told, that immediate-return behaviour being usual > on most unixes. Seems to remain from times ago when terminals were few? Hmm, i cannot judge about ``most unixes'', but all i've seen did actually wait until the operation was complete. Hmm, no, for DG/UX, they did mostly wait, but they didn't for the rewind to complete. (To make it clearer: mt fsf _did_ wait, but the implicit rewind after tar closing a tape device returned to userland immediately. Further open attempts of the tape devices yielded a ``Device busy'' until the rewind was complete.) Well, there are many ways to skin a cat... > And I'm very sure there *is* a bug somewhere: After some stangeness occured, > I put back my kernel changes to original state, and worked around the EIO > error with a user-level C-programm (as a substitute for "dd"), that would > simply retry the read(). This did crash the whole system on extensive tape > read operations (while lots of other programs running); e.g. the news-system > would report errors like "catt: not found" or [...] Hmm, i haven't been using my QIC-02 drive very much, but from the description, this looks like DMA problems. -- 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. ;-)