*BSD News Article 63947


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From: les@MCS.COM (Leslie Mikesell)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Need a new machine...is IDE ok?
Date: 9 Mar 1996 00:41:22 -0600
Organization: /usr/lib/news/organi[sz]ation
Lines: 23
Message-ID: <4hr96i$fii@Mercury.mcs.com>
References: <4hjooo$a2f@gol2.gol.com> <313E9006.59E2B600@freebsd.org>
NNTP-Posting-Host: mercury.mcs.com

In article <313E9006.59E2B600@freebsd.org>,
Jordan K. Hubbard <jkh@FreeBSD.org> wrote:

>SCSI peripherals are generally better behaved, faster (in terms of
>transfer overhead, anyway) and easier to migrate between different
>machines should you decide to upgrade or expand later.  A SCSI
>controller will also do a lot more than let you put a couple of drives
>on it - you can also stick CDs, tapes, scanners, all manner of devices
>there.  There are no IDE drives in any of my systems! :-)

On the other hand, I've found that if you plan to load a variety of
operating systems it is handy to have one IDE drive in the machine
so you don't have to worry about finding/loading the correct SCSI
driver before you have the computer operational.  Also, I don't have
exactly identical machines to test but I think the IDE/SCSI combo
machines 'feel' faster than pure SCSI.  I've always wondered if
the data from the IDE drive automatically ended up in the CPU cache
where the busmastering SCSI doesn't with the effect that it takes
longer if you are waiting for something.  Does anyone know if this
is the case?

Les Mikesell
  les@mcs.com