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Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!agate!doc.ic.ac.uk!uknet!mcsun!Germany.EU.net!gmdtub!g386bsd!ats From: ats@g386bsd.first.gmd.de (Andreas Schulz) Newsgroups: comp.os.386bsd.questions Subject: Re: MT-02 Message-ID: <3914@bigfoot.first.gmd.de> Date: 22 Aug 93 00:39:08 GMT References: <match.21.0@> <CC3zDw.Iu0@sugar.NeoSoft.COM> Sender: news@bigfoot.first.gmd.de Organization: GMD-FIRST Lines: 35 In article <CC3zDw.Iu0@sugar.NeoSoft.COM> peter@NeoSoft.com (Peter da Silva) writes: >In article <match.21.0@> match@ (Marvin Match) writes: >> Has anyone been successfull in using the Emulex Mt-02 QIC-SCSI controller >> board with a QIC 24,36, or 02 tape drive under NetBSD or 386BSD? > >I was JUST ABOUT to post something about that. > >I'm using an MT-02 with an archive 59xx 60MB drive. It works (it's >recognised by my 1540B, and I can read/write data), but it's kinda flakey: >it doesn't handle bad patches on the tape at all, and I get a lot of weird >errors (like, empty messages!). Also, the controller claims 91000 blocks >of 512 bytes (which comes to 45M, not 60M) and I can actually only write >about 63000 blocks on any of the tapes I have. That's about half the >capacity I expected. I was going to put that down to streaming overhead >but it's streaming pretty well (much better than the Intel Multibus boxes >at work!). This combination sounds like an old SUN shoebox drive :-). It is normal, that it would you give only 45Mb on the probe, because the 60Mb are only with the extra-length cartridges. And the problem with only getting 30-31Mb on the tape. Are you sure, that you are writing in QIC-24 mode ? This old SUN drives knows two modes, QIC24 and QIC11, and QIC11 maxes out at 30Mb. On the SUN, you reached the QIC11 mode with the normal st0/rst0 and the QIC24 mode with st8/rst8. I don't know, if the st driver on 386BSD/FreeBSD/NetBSD has anywhere a flag to switch between different modes. Try to read a tape on a 150Mb streamer that can also read QIC-24 mode, if you can read it, you are in QIC-24 mode. If you can't read it, your tape operates in the QIC-11 mode. -- ATS ( ats@first.gmd.de or ats@cs.tu-berlin.de ) Andreas Schulz GMD-FIRST 12489 Berlin-Adlershof Rudower Chaussee 5 Gebaeude 13.7 Tel: +49-30-6392-1856 Germany/Europe