[5317] in linux-scsi channel archive
Re: Dumb question: Which is "better" SCSI or IDE disks?
daemon@ATHENA.MIT.EDU (Leonard Zhang System Administrator)
Sun Dec 6 10:51:46 1998
Date: Sun, 6 Dec 1998 20:59:09 +1000 (AEST)
From: Leonard Zhang System Administrator ISD RVIB <leonardz@rvib2.rvib.org.au>
Reply-To: 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.3.96.981205161535.960B-100000@mirkwood.dummy.home>
Please don't multiple post, I already got it.
Leonard
On Sat, 5 Dec 1998, Rik van Riel wrote:
> On Sat, 5 Dec 1998, Leonard Zhang System Administrator ISD RVIB wrote:
>
> > 1. Some hard disk manufactures are using same disk drive
> > (physically) to make SCSI and ATA. They only change the PCB board.
>
> And together with that they change the cache and add far
> superior firmware than the crap they put on the IDE disk.
>
> > 2. SCSI-1 and SCSI-2 have 8 bit data bus, while ATA have 16 bit data
> > bus.
>
> Irrellevant and not always true. SCSI utilizes the bus much
> more efficiently (disconnect/reconnect) so the effective
> bandwidth is usually more with SCSI.
>
> > 3. ATA got disk cache built in as well.
>
> But it is usually far less cache and ATA doesn't provide
> the logic infrastructure to actually use it in an intelligent
> way (although IDE write caching has improved things a little
> bit). You lose another data point for the fact that IDE
> cache firmware often is almost braindead.
>
> > 4. Some low end of SCSI host card is only 8 Bit card.
>
> Some low end IDE drives are slow -- what's your point?
>
> We are comparing the equipment of TODAY. It would be
> total nonsense to compare IDE stuff from today with
> 1991's SCSI controllers...
>
> The way you are comparing IDE and SCSI is just too biassed
> to be taken seriously -- please make a more balanced
> judgement next time...
>
> 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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>
>
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