[5358] in linux-scsi channel archive
Re: Dumb question: Which is "better" SCSI or IDE disks?
daemon@ATHENA.MIT.EDU (Leonard Zhang System Administrator)
Tue Dec 8 06:50:53 1998
Date: Tue, 8 Dec 1998 09:35:43 +1000 (AEST)
From: Leonard Zhang System Administrator ISD RVIB <leonardz@rvib2.rvib.org.au>
To: Rik van Riel <H.H.vanRiel@phys.uu.nl>
cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, leighton@mail.imake.com,
linux-kernel@vger.rutgers.edu, linux-scsi@vger.rutgers.edu
In-Reply-To: <Pine.LNX.3.96.981207142403.23360Q-100000@mirkwood.dummy.home>
Your killfile still does not work :-) :-) :-)
Leonard
On Mon, 7 Dec 1998, Rik van Riel wrote:
> On Mon, 7 Dec 1998, Leonard Zhang System Administrator ISD RVIB wrote:
> > On Sun, 6 Dec 1998, Alan Cox wrote:
> >
> > > > I think currently spinning SCSI hard disks on the world, either in servers
> > > > or workstation, either in Unix/Linux or NT, is 50-pin old guys, no DPT disk
> > >
> > > And as my stats showed for real work even old 5400 rpm fast scsi on a
> > > now discontinued adapter (the BT946) beats current UDMA IDE for real world
> > > compiles. You "think". I've "measured"
> >
> > Open server 5.0.4p, DPT RAID-1, 32 MB cache, PCI, 4.2 GB (A cable)
> >
> > copy 9,177 K in 9 seconds.
> >
> > Red hat 4.2, 8 GB IDE
> >
> > copy 9,397 K in 2 seconds.
> >
> > both run in shell script.
>
> Sigh...
>
> You benchmarked two different drives under different OSes on
> different machines and try to extend those results to a general
> performance difference between SCSI and IDE...
>
> (sounds rather rediculous when viewed this way, doesn't it)
>
> This is simply not a proper benchmark for the results you want
> to achieve. If you want to prove that IDE gives you more bang
> for the buck, you should get a machine and use a SCSI subsystem
> and an IDE subsystem which cost about the same amount of money
> _in that same machine_ and test _using the same OS_ and the
> _same workload_. Furthermore, you should be using a realistic
> workload and not one that's been tuned to give the result you
> want.
>
> regards,
>
> Rik -- the flu hits, the flu hits, the flu hits -- MORE
> +-------------------------------------------------------------------+
> | Linux memory management tour guide. H.H.vanRiel@phys.uu.nl |
> | Scouting Vries cubscout leader. http://www.phys.uu.nl/~riel/ |
> +-------------------------------------------------------------------+
>
>
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