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Path: sserve!newshost.anu.edu.au!munnari.oz.au!constellation!convex!convex!darwin.sura.net!jhunix.hcf.jhu.edu!jhunix.hcf.jhu.edu!not-for-mail From: philippe@jhunix.hcf.jhu.edu (Philippe Pouliquen) Newsgroups: comp.os.386bsd.bugs Subject: Re: IOZONE results Date: 23 Mar 1993 13:17:34 -0500 Organization: Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Md, USA Lines: 19 Sender: philippe@zeus.ece.jhu.edu Message-ID: <1onk7uINNf87@jhunix.hcf.jhu.edu> References: <C43MBo.3owM@austin.ibm.com> NNTP-Posting-Host: jhunix.hcf.jhu.edu In article <C43MBo.3owM@austin.ibm.com> fredriks@austin.ibm.com (Lars Fredriksen) writes: > I ran iozone auto on my machine and got the maximum of 500K/s >throughtput. I saw a report from someone running Interactive Unix on >a 50MHz 486 with a Bustek controller getting 4.5M/s. > Although this may not be the answer to your problem (I'm not familiar with iozone), I did encounter a similar effect with an Adaptec 8500 tape drive. Although the SCSI rate is around 4M/s, this is a burst rate and can only be sustained for about 250Kbytes (despite the tape drive having a 1Mbyte buffer). The sustained rate is only 500K/s. I'd be interested in *anyone* who can sustain more than 1M/s on a SCSI hard disk for over 100Mbyte transfers (ie transfer at least 100Mbytes in less than 100 seconds). (please reply by e-mail. No RAID devices) Philippe Pouliquen philippe@zeus.ece.jhu.edu (zeus is at 128.220.14.9 on the internet)