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Newsgroups: comp.unix.bsd.freebsd.misc Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!news.unimelb.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!howland.erols.net!newsfeed.nacamar.de!news-feed.inet.tele.dk!enews.sgi.com!news.sgi.com!bellman.NSD.3Com.COM!news.erg.sri.com!news.sri.com!hplabs!hplntx!hplb!hpcpb!news From: "Al Slater" <aslater@bri.hp.com.remove> Subject: Re: Problems with streamer 35480A under 2.2.1 and 2.1.5 Sender: news@bri.hp.com (News User) Message-ID: <01bc8618$bb4f3a40$1573900f@hpcpbla.bri.hp.com> Date: Tue, 1 Jul 1997 12:17:49 GMT References: <33AE50B5.22B2@i5.informatik.rwth-aachen.de> <5oo08j$5ub$2@easystreet03> Nntp-Posting-Host: dhcp7.bri.hp.com Organization: Hewlett Packard X-Newsreader: Microsoft Internet News 4.70.1162 Lines: 59 Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:43799 tedm@portsoft.com wrote in article <5oo08j$5ub$2@easystreet03>... > In <33AE50B5.22B2@i5.informatik.rwth-aachen.de>, Norbert Grundmann <grundman@i5.informatik.rwth-aachen.de> writes: > >Hi, > > > >i habe an HP 35480A streamer. It does not seem to work > >correct. Doing a 'mt -f /dev/nrst0 erase' failed after > >several minutes. Reading a tape that was writting by a > >HP 1533 streamer is not possible (The streamer was written > >by solaris 2.5). My (new) FreeBSD 2.2.1 system was (sometimes) > >hanging and only a reset was possible. The HP35480A > >streamer has the version 7.9 (!?). Any answers are welcome. > > 35480A is DDS1/DC. 1533 is DDS2. You can't read DDS2 tapes in a DDS1 drive ...which might be the obvious problem. > HP has buried on their technical support web site a list of all of their tape drives > and what the little switches on the bottom are supposed to be set to for various > Unixii. The tape drive is probably jumpered in some weird mode - if I remember > right Solaris likes everything on it's SCSI chain jumpered at fixed 512-byte blocks, > which is a real pain in the ass when attempting to put a CD on a Sparc. (since > few CD drives have the required jumper on the back) YUCK! Nooo -- 512 byte transfers with tapes, unless you are using a fixed mode device that won't do variable and is dog slow is Going To Suck, badly. You can set the drive to fixed mode via the dips but it isn't recommend in any of the dip settings on the web for Unixen -- run it in fixed or variable by poking the right SCSI at it and sending it sensible sized amounts per write()/read() call which /should/ translate to the identical SCSI read/write command (modulo DMA limitations). > Also, a lot of those 4mm DAT drives will upchuck when fed SCSI in synchronous > mode, even after happily negotiating sync mode with the SCSI card. If you have a > reasonably advanced SCSI card, set the SCSI ID on the tapedrive to max 5MBt > and no sync negotiation. The only thing you really need to have running on > a SCSI tape drive is disconnection. Errm, I don't recall us having that option on the drive via jumpers -- you can set that via the SCSI bios on some boards though. cheers, al (not speaking for HP..)