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From: Michael Monnerie <michael.monnerie@is.it-management.at>
Subject: Re: How to track down abysmal performance ata - raid1 - crypto -
	vg/lv - xfs
Date: Wed, 4 Aug 2010 11:16:09 +0200
References: <20100804073546.GA7494@comet.dominikbrodowski.net>
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To: Dominik Brodowski <linux@dominikbrodowski.net>, linux-raid@vger.kernel.org, xfs@oss.sgi.com, linux-kernel@vger.kernel.org

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On Mittwoch, 4. August 2010 Dominik Brodowski wrote:
> The read performance is abysmal. The ata devices can be ruled out, as
>  hdparm
>=20
> resulted in acceptable performance:
> > Timing cached reads:   9444 MB in  2.00 seconds =3D 4733.59 MB/sec
> > Timing buffered disk reads:  298 MB in  3.02 seconds =3D  98.73
> > MB/sec

Has that system been running acceptable before? If yes, what has been=20
changed that performance is down now?

Or is it a new setup? Then why is it in production already?

Can you run bonnie on that system?
What does "dd if=3D<your device> of=3D/dev/null bs=3D1m count=3D1024" say?
What does "dd if=3D/dev/zero of=3D<your device> bs=3D1m count=3D1024" say?


=2D-=20
mit freundlichen Gr=FCssen,
Michael Monnerie, Ing. BSc

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