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Date:      Wed, 12 Aug 1998 10:38:13 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Scott Leutenegger <leut@cs.du.edu>, freebsd-questions@FreeBSD.ORG
Subject:   Re: raw disk question
Message-ID:  <19980812103813.X22754@freebie.lemis.com>
In-Reply-To: <Pine.SOL.3.96.980811172046.20645A-100000@chocolate>; from Scott Leutenegger on Tue, Aug 11, 1998 at 05:21:57PM -0600
References:  <Pine.SOL.3.96.980811172046.20645A-100000@chocolate>

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On Tuesday, 11 August 1998 at 17:21:57 -0600, Scott Leutenegger wrote:
> Hi,
>
> Want to help convert a solaris user to FreeBSD?
>
> Question:  Does FreeBSD support raw disks access?

Yes.

>            i.e. a read/write to/from disk does NOT access
> 	   the file cache in memory, but rather 100% of the
> 	   accesses go-to/come-from disk.
>
>            If so, how do I create the raw disk partition?

It's there already.  For every cooked disk /dev/sd<foo>, you have a
raw disk /dev/rsd<foo>.

> Note:      I am trying to decide whether to install solarix x86 or
> 	   FreeBSD on a cluster of PCs to build a parallel database
> 	   application (parallel multi-dimensional indexing)
> 	   I know solaris x86 supports this, but have been lead to believe
> 	   FreeBSD will be faster, easier to install/maintain, and
> 	   comes loaded with most of the software (gcc/g++/sockets/perl) I need.
> 	   (please correct me if I am wrong)

That really depends on the database application.  FreeBSD doesn't have
kernel threads.

Greg
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