From owner-freebsd-geom@FreeBSD.ORG  Wed Mar 28 13:44:28 2007
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Date: Wed, 28 Mar 2007 15:44:11 +0200
From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
To: "R. B. Riddick" <arne_woerner@yahoo.com>
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Subject: Re: raid3 is slow
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On Wed, Mar 28, 2007 at 06:21:34AM -0700, R. B. Riddick wrote:
> > # atacontrol mode ad0
> > current mode =3D UDMA100
> > # atacontrol mode ad1
> > current mode =3D UDMA100
> > # atacontrol mode ad2
> > current mode =3D UDMA100
> > # atacontrol mode ad3
> > current mode =3D UDMA100
> > # atacontrol mode ad6
> > current mode =3D SATA150
> >
> Looks good...

Does it? It seems there are two disks per ata channel, which is very bad
for performance.

I suggesting trying this:

	# apply "dd if=3D/dev/ad%1 if=3D/dev/null bs=3D1m count=3D250 &" 0 1 2 3 6

and once it completes try this:

	# dd if=3D/dev/raid3/<name> of=3D/dev/null bs=3D1m count=3D1000

and send the results here.

--=20
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd@FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!

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