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Xref: sserve comp.os.linux:39324 comp.os.386bsd.questions:2548 comp.unix.pc-clone.32bit:2834 Newsgroups: comp.os.linux,comp.os.386bsd.questions,comp.unix.pc-clone.32bit Path: sserve!newshost.anu.edu.au!munnari.oz.au!constellation!rex!ben From: ben@rex.uokhsc.edu (Benjamin Z. Goldsteen) Subject: Re: IDE vs SCSI and performance Message-ID: <C78rG8.707@rex.uokhsc.edu> Date: Tue, 18 May 1993 21:24:07 GMT Reply-To: benjamin-goldsteen@uokhsc.edu References: <1993May13.182917.23510@mav.com> <C72CAw.B47@sugar.NeoSoft.COM> <1993May17.190905.3462@gandalf.ca> Organization: Health Sciences Center, University of Oklahoma Lines: 36 ykhan@gandalf.ca (Yousuf Khan) writes: >In <C72CAw.B47@sugar.NeoSoft.COM> peter@NeoSoft.com (Peter da Silva) writes: >>I was talking to a fellow in a computer store the other day, and he was >>insisting that he was getting 2.5 MB/s on his IDE drives under AmigaOS, >>over twice what he got with SCSI. >I don't think that IDEs are available for Amigas yet, are they? IDEs >as far back as I can remember were designed with the IBM PC AT ISA >bus in mind specifically. Even the XT ISA bus was not part of the >scheme. However they did build adapters to make it work on an XT >ISA bus, and I think they've even made adapters to make it work >on a PS/2 MCA bus now. So who knows maybe its available for the >Amigas. >>I found that hard to beleive... I suspected that his benchmark was being >>messed up by buffering. >It's likely buffering. There's not a drive in existence that can >transfer at that rate without some kind of hardware or software >buffering. People like to point out the _potential_ speed of >SCSI hardware, but they all ignore the fact that no SCSI drive >even approaches this potential. The potential in an IDE might >be lower than a SCSI's potential, but so far they are pretty >equal in the real world. I wouldn't really say that... Quite a few of the high-end drives are actually rather decent. I have a reference for a MO disk system that sustains 12MBytes/second (I have no idea how much this costs...) Low-end SCSI's versus IDE might be about the same... -- Benjamin Z. Goldsteen