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From: guyd@austin.ibm.com (Guy Dawson)
Subject: Re: IDE vs SCSI and performance
Originator: guyd@pal500.austin.ibm.com
Sender: news@austin.ibm.com (News id)
Message-ID: <C7C0C1.1DM9@austin.ibm.com>
Date: Thu, 20 May 1993 15:28:49 GMT
References: <C72CAw.B47@sugar.NeoSoft.COM> <1993May17.190905.3462@gandalf.ca> <C78rG8.707@rex.uokhsc.edu> <1tftbuINNn9l@rave.larc.nasa.gov>
Organization: IBM Austin
Lines: 53
In article <1tftbuINNn9l@rave.larc.nasa.gov>, jcburt@gatsibm.larc.nasa.gov () writes:
> 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...?
The disk...
Especially if you want it to seek.
>
> John
>
>
Guy
--
-- -----------------------------------------------------------------------------
Guy Dawson - Hoskyns Group Plc.
guyd@hoskyns.co.uk Tel Hoskyns UK - 71 251 2128
guyd@austin.ibm.com Tel IBM Austin USA - 512 838 3377