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Xref: sserve comp.periphs.scsi:19409 comp.os.386bsd.questions:9759 Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msuinfo!netnews.upenn.edu!news.amherst.edu!news.mtholyoke.edu!news.byu.edu!gatech!news-feed-2.peachnet.edu!news-feed-1.peachnet.edu!apollo1.cacd.rockwell.com!newsrelay.iastate.edu!hobbes.physics.uiowa.edu!news.uiowa.edu!icaen!dsiebert From: dsiebert@icaen.uiowa.edu (Doug Siebert) Newsgroups: comp.periphs.scsi,comp.os.386bsd.questions Subject: Re: 6% UNIX overhead on SCSI disk? Date: 15 Apr 1994 22:31:08 GMT Organization: Iowa Computer Aided Engineering Network, University of Iowa Lines: 31 Message-ID: <2on4jc$pfo@news.icaen.uiowa.edu> References: <FEN.94Apr13121431@imagine.comedia.com> <766339489snz@genesis.demon.co.uk> NNTP-Posting-Host: l_cae12.icaen.uiowa.edu fred@genesis.demon.co.uk (Lawrence Kirby) writes: >In article <FEN.94Apr13121431@imagine.comedia.com> > fen@imagine.comedia.com "Fen Labalme" writes: >>Hi. >> >>(System: stock NetBSD-0.9 on a '486 box with Adaptec 1542C SCSI adapter >> and CONNER-545 (sd0) + MAXTOR-1240 (sd1) + ...) >> >>I've just installed the Maxtor, disklabled it, newfs'd and mounted it. >>Yea! But when I did a `df` I saw that I was missing 6.1% of the disk! >Check the real size of the disk. I haven't used NetBSD but it probably has >a version of fdisk you can use to do this. It may just be that maxtor are >pulling a fast one by quoting their capacities in 'decimal' gigabytes (i.e. >1,000,000,000) instead of 'binary' gigabytes (i.e. 2^30 which is 1,073,741,824) >You'll notice that the difference is about 72 Megabytes. >>The Conner drive's overhead appears to be only about 2.9%, which is >>definatley more reaonable. But 6% of a 1.2 GB drive is 74 MB !!!! Actually Maxtor is better than most. The drive really gets 1240M of space, in my experience at least. If you format it with 1024 byte sectors (which you can't do on cheesy PC hardware) you get about 1310M! -- Douglas Siebert dsiebert@isca.uiowa.edu