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Xref: sserve comp.os.linux:39594 comp.os.386bsd.questions:2575 comp.unix.pc-clone.32bit:2873 Path: sserve!newshost.anu.edu.au!munnari.oz.au!constellation!convex!convex!darwin.sura.net!news.larc.nasa.gov!gatsibm.larc.nasa.gov!jcburt From: jcburt@gatsibm.larc.nasa.gov () Newsgroups: comp.os.linux,comp.os.386bsd.questions,comp.unix.pc-clone.32bit Subject: Re: IDE vs SCSI and performance Date: 20 May 1993 12:25:34 GMT Organization: NASA Langley Research Center Lines: 38 Message-ID: <1tftbuINNn9l@rave.larc.nasa.gov> References: <C72CAw.B47@sugar.NeoSoft.COM> <1993May17.190905.3462@gandalf.ca> <C78rG8.707@rex.uokhsc.edu> NNTP-Posting-Host: gatsibm.larc.nasa.gov In article <C78rG8.707@rex.uokhsc.edu> benjamin-goldsteen@uokhsc.edu writes: >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. > [...stuff deleted...] >>>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... I wonder how "local-bus" versus ISA bus fits into this comparison? I haven't seen many local-bus SCSI controllers, but local-bus IDE interface cards are becoming more common...so, what *is* the dominating factor as far as data transfer rates: the disk drive, the interface card/controller, the bus...? John