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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.mel.connect.com.au!munnari.OZ.AU!news.ecn.uoknor.edu!news.cis.okstate.edu!news.ksu.ksu.edu!news.physics.uiowa.edu!math.ohio-state.edu!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news.mathworks.com!zombie.ncsc.mil!cs.umd.edu!not-for-mail From: torek@elf.bsdi.com (Chris Torek) Newsgroups: comp.unix.bsd.bsdi.misc Subject: Re: SCSI disk geometries: weird probe defaults are faster than custom! Date: 3 Jan 1996 19:15:27 -0800 Organization: Berkeley Software Design, Inc. Lines: 15 Message-ID: <4cfgof$1e7@elf.bsdi.com> References: <4cf25e$m82@olympus.nwnet.net> Reply-To: torek@bsdi.com NNTP-Posting-Host: elf.bsdi.com In article <4cf25e$m82@olympus.nwnet.net> Anthony D'Atri <aad@nwnet.net> writes: >... dumpfs complained about there not being room for the rotation >tables. This led me to discover that when one has disksetup [P]robe >[this] disk, it defines the geometry [with 1 head, and 1 MB / `cylinder']. As Terry Kennedy noted, the latter is deliberate. This special geometry forces sequential rather than rotational layout; for SCSI disks (which are mostly ZBR these days) this generally results in much better performance. The complaint from dumpfs is a (minor) bug, fixed in 2.1. -- In-Real-Life: Chris Torek, Berkeley Software Design Inc El Cerrito, CA Domain: torek@bsdi.com +1 510 234 3167