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sunit & swidth on RAID-1?

To: xfs@xxxxxxxxxxx
Subject: sunit & swidth on RAID-1?
From: mike dentifrice <fluor@xxxxxxxxxxx>
Date: Wed, 11 Feb 2009 16:56:38 +0100
User-agent: Mutt/1.5.18 (2008-05-17)
Hello,

I would like to know if it makes any sense to specify sunit & swidth
parameters as mount options to XFS filesystems sitting on a Linux
software RAID-1 array, as advertised here [1] or there [2].

I'm asking, because it seems that chunk_size does not matter in a RAID-1
context, nor do stripe units; or do they?

Any tip would be appreciated,

[1] http://www.socalsysadmin.com/2008/10/15/optimizing-xfs-on-raid-arrays/
[2] http://feedblog.org/2008/06/18/howto-configure-raid-strides-in-xfs/

-- 
mike dentifrice <fluor@xxxxxxxxxxx>

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