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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.uwa.edu.au!classic.iinet.com.au!swing.iinet.net.au!news.uoregon.edu!news.emf.net!overload.lbl.gov!lll-winken.llnl.gov!uwm.edu!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!Germany.EU.net!zib-berlin.de!news.tu-chemnitz.de!irz401!uriah.heep!not-for-mail From: j@uriah.heep.sax.de (J Wunsch) Newsgroups: comp.unix.bsd.freebsd.misc,comp.os.linux.hardware Subject: Re: Tape backup speed FreeBSD v. Linux Date: 31 Oct 1995 00:20:58 +0100 Organization: Private FreeBSD site, Dresden. Lines: 23 Message-ID: <473mkq$8lj@uriah.heep.sax.de> References: <1995Oct30.090118.28117@state.systems.sa.gov.au> NNTP-Posting-Host: uriah.heep.sax.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:8254 comp.os.linux.hardware:20316 <chdemgt@state.systems.sa.gov.au> wrote: >Claimed by Tandberg in the spec: 12/18 MB/min >FreeBSD 951020 SNAP: 9.1 MB/min >Linux 1.2.x (forget exactly): 15.4 MB/min > >The something was wrong could be detected at once by ear. On FreeBSD the tape >seems to run forward for 1.5 sec and then back for 1.5 sec. This continues >without intermission during the backup. On Linux the tape seems to run >forwards for long periods of time, very occasionally reversing once. You need to tell us what you did exactly. In order to get optimum performance you should either: * fix the driver to large blocks, or * run the backup command (tar, cpio, dump) with a large block size. `large' means 16k or 32k. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)