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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!nntp.coast.net!chi-news.cic.net!newspump.sol.net!www.nntp.primenet.com!nntp.primenet.com!cs.utexas.edu!news.sprintlink.net!news-peer.sprintlink.net!uunet!in3.uu.net!newsflash.concordia.ca!news.nstn.ca!coranto.ucs.mun.ca!news.unb.ca!agate.nbnet.nb.ca!news From: cavenerl@nbnet.nb.ca (Lance Cavener) Newsgroups: comp.unix.admin,comp.unix.questions,comp.unix.misc,comp.unix.solaris,comp.unix.bsd.bsdi.misc Subject: Re: ideal parameters for backup tape Date: Sat, 14 Sep 1996 12:56:17 GMT Organization: Senarius Inc. Lines: 46 Message-ID: <51gugv$818@agate.nbnet.nb.ca> References: <323954B8.167EB0E7@innet.be> <51e1gk$cv2@agate.nbnet.nb.ca> <51ghpe$qh1@luva.lb.bawue.de> Reply-To: cavenerl@nbnet.nb.ca NNTP-Posting-Host: mctnts02c07.nbnet.nb.ca X-Newsreader: Forte Free Agent 1.0.82 Xref: euryale.cc.adfa.oz.au comp.unix.admin:47383 comp.unix.questions:87681 comp.unix.misc:25107 comp.unix.solaris:82618 comp.unix.bsd.bsdi.misc:4876 On stardate 15 Sep 1996 11:20:46 +0200, migieger@luva.lb.bawue.de (Michael Giegerich) sent holographic email and wrote: >>>I need to backup my files using (ufs)dump. The problem is that I don't >>>know which parameters are ideal. Can someone help me? >> >>>Here is the available information of the tape: >>>Sony, DAT, DG90MAa, 90 m/295 feet, DDS, 4 mm >This tape normally holds 2 GB uncompressed and up to >8 GB compressed data (according to HP or Sony etc.). >Actually when used in a BSD/OS system you won't never >get 8 MB on your tape - I doubt you get 4 MB on the >tape - as you will already have compressed files on >your disks and these won't get compressed any more >by the streamer. Umm. 8 meg? 4 meg? :) >>> dump 0dsbfu 54000 13000 126 remote_tape filesystem >See above (I don't fiddle w/ density, tape length...) Well, don't you have to tell dump the tape length in feet and its density so dump can calculate the tapes meggage? (Unix can be dumb sometimes.. They should just have a command that you TELL dump the # of megs :P) >> I just use >> >> dump 0fu /dev/rst0_dds 9999999 /usr >You stand by, while the system is dumping? Sure. Its only a 2 gig HD. -- ,-------------------------------------------------------, |Lance Cavener Systems Administrator | |cavenerl@nbnet.nb.ca Senarius Inc. | |admin@novacon.com | |"Microsoft sent 54 programmers to Apple? You lie......"| `-------------------------------------------------------'