Return to BSD News archive
Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!nntp.coast.net!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!jussieu.fr!math.ohio-state.edu!uwm.edu!news-peer.gsl.net!news.gsl.net!news.mathworks.com!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: 15 Sep 1996 11:20:46 +0200 Organization: BaWue-Net Ludwigsburg Lines: 45 Message-ID: <51ghpe$qh1@luva.lb.bawue.de> References: <323954B8.167EB0E7@innet.be> <51e1gk$cv2@agate.nbnet.nb.ca> NNTP-Posting-Host: luva.lb.bawue.de Xref: euryale.cc.adfa.oz.au comp.unix.admin:47380 comp.unix.questions:87678 comp.unix.misc:25106 comp.unix.solaris:82606 comp.unix.bsd.bsdi.misc:4874 >>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. I'm using 2 GB as parameter on a HP35480/90m DAT not taking any advantage of the compression capabilities of the streamer - but I prefer having reliable unatten- ded backups vs. gaining some MB more on the tape... Since many years I use ``dump 0uBf 2033646 /dev/nrst. /dev/sd..'' in a script. It works and the backups saved me some/many :-) times from big trouble. >>I'm using as platform BSDI (dump) and Solaris 2.4 (ufsdump). > >>Currently my two commands are: > >> dump 0dsbfu 54000 13000 126 remote_tape filesystem See above (I don't fiddle w/ density, tape length...) ... > I just use > > dump 0fu /dev/rst0_dds 9999999 /usr You stand by, while the system is dumping? -- Michael Giegerich, E-Mail: migieger@luva.lb.bawue.de, Voice: +49 7144 39337