sunit & swidth on RAID-1?

[Justin Piszcz]

On Wed, 11 Feb 2009, mike dentifrice wrote:

> 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 at poivron.org>
>
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mkfs.xfs will auto-optimize for software-raid arrays for the most part, 
with HW raid on a 3ware controller, tweaking mkfs.xfs does not help very 
much.  with SW raid, at least for raid1 - I use the defaults.

Justin.