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

To: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>, linux-raid@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
Subject: Re: How to track down abysmal performance ata - raid1 - crypto - vg/lv - xfs
From: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 4 Aug 2010 11:16:09 +0200
In-reply-to: <20100804073546.GA7494@xxxxxxxxxxxxxxxxxxxxxxxxxx>
Organization: it-management http://it-management.at
References: <20100804073546.GA7494@xxxxxxxxxxxxxxxxxxxxxxxxxx>
User-agent: KMail/1.12.4 (Linux/2.6.34.1-zmi; KDE/4.3.5; x86_64; ; )
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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