From: Kay Diederichs <kay.diederichs@uni-konstanz.de>
Subject: Re: Uneven load on my raid disks.
Date: Wed, 29 Dec 2010 17:40:12 +0100
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References: <20101228090749.GB1351@bitwizard.nl>
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Cc: linux-ext4@vger.kernel.org
To: Rogier Wolff <R.E.Wolff@BitWizard.nl>
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Rogier Wolff wrote:
...
> 
> http://www.goplexian.com/2010/09/6-tips-for-improving-hard-drive.html
> 
> says: 
> dumpe2fs -h /dev/md0 | grep RAID
> 
> should show wether my ext4 partition is on a RAID. Well mine is, but
> doesn't provide any output. Did I forget those raid-options during
> formatting? Can this be tuned after the fact?
> 

% tune2fs -l /dev/md0

...
RAID stride:              128
RAID stripe width:        768
...

runs much faster than dumpe2fs.
The command can also adjust the values.

HTH,
Kay