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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msuinfo!netnews.upenn.edu!news.amherst.edu!news.mtholyoke.edu!uhog.mit.edu!europa.eng.gtefsd.com!howland.reston.ans.net!usenet.ins.cwru.edu!news.csuohio.edu!stever From: stever@csuohio.edu (Steve Ratliff) Subject: Re: dump parameters for HP 35480 DAT drive Message-ID: <1994Jun21.233602.21580@news.csuohio.edu> Sender: news@news.csuohio.edu (USENET News System) Organization: Cleveland State University X-Newsreader: TIN [version 1.2 PL2] References: <Crpn94.21B@luva.stgt.sub.org> Date: Tue, 21 Jun 1994 23:36:02 GMT Lines: 51 Michael Giegerich (migieger@luva.stgt.sub.org) wrote: : Hi, : I have this little gem of DAT drive and can't force it to do : what I want, grrrr... : I found out that the drive uses 61000 bpi media, but a 90 m : (295 feet) cartridge gives me 295*12 in * 61000 bpi = about 200 MB. : Much lesser than the 2 GB uncompressed and the 8 GB compressed : data a cartridge should hold (yes I know, that's unlikely to stuff : 8 GB of gzip'ed code onto the cartridge). : So I'm puzzled what tape length I must give to dump as parameter... : And is it up to me to _guess_ what is the tape length parameter : with compression enabled? I have found that it is much easier to use the "B" option to dump and tell it how many K of data you want it to put on a tape. i.e. dump 0ufB /dev/rwt0b 60120 /usr This is what I use to do a level 0 dump of my /usr partition onto 60MB qic 02 tapes. It will prompt you for new tapes when it needs them. Steve : One friend told me "I'm using a ridiculous high tape length on a : Sun to fake unlimited tape - with the disadvantage that I must be : sure I haven't to change tape" :-( : I would consider this only as 2nd best choice... : Bye, : -Michael : P.S. Please give the apropriate restore commands and the /dev to : use too (it saves me endless tries and errors). Thanks. : -- : ------------------------------+------------------------------ : Michael Giegerich | migieger@luva.stgt.sub.org : ------------------------------+------------------------------ -- -------------------------------------------------------------------------- stever@babbage.cba.csuohio.edu "What's better than a free OS?" " A free OS with source." FreeBSD at freebsd.cdrom.com --------------------------------------------------------------------------