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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!ddsw1!news.mcs.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!in1.uu.net!fu-berlin.de!news.belwue.de!news.bawue.de!luva.lb.bawue.de!luva.lb.bawue.de!not-for-mail From: migieger@luva.lb.bawue.de (Michael Giegerich) 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: 16 Sep 1996 20:13:37 +0200 Organization: BaWue-Net Ludwigsburg Lines: 30 Message-ID: <51k5ch$hqm@luva.lb.bawue.de> References: <323954B8.167EB0E7@innet.be> <51e1gk$cv2@agate.nbnet.nb.ca> <51ghpe$qh1@luva.lb.bawue.de> <51gugv$818@agate.nbnet.nb.ca> NNTP-Posting-Host: luva.lb.bawue.de Xref: euryale.cc.adfa.oz.au comp.unix.admin:47418 comp.unix.questions:87742 comp.unix.misc:25124 comp.unix.solaris:82710 comp.unix.bsd.bsdi.misc:4881 [... storage on 90 m DAT DDS ...] >>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? :) You chose :-) If you believe a compression ratio of 4:1 it's 8 GB if you believe only 2:1 it's 2 GB... As stated later I'm not believing anything and assume 1:1 though putting only 2 GB on the tape :-) [...] > 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) You don't have to tell it the length. You actually TELL dump how many bytes it can store on the tape using parameter ``B''. -- Michael Giegerich, E-Mail: migieger@luva.lb.bawue.de, Voice: +49 7144 39337