linux-kernel - Re: How to track down abysmal performance ata - raid1 - crypto - vg/lv

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

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

Has that system been running acceptable before? If yes, what has been 
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=<your device> of=/dev/null bs=1m count=1024" say?
What does "dd if=/dev/zero of=<your device> bs=1m count=1024" say?


-- 
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Michael Monnerie, Ing. BSc

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