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Re: sunit & swidth on RAID-1?

To: mike dentifrice <fluor@xxxxxxxxxxx>
Subject: Re: sunit & swidth on RAID-1?
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Date: Wed, 11 Feb 2009 11:42:51 -0500 (EST)
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20090211155638.GA3864@dentifrice>
References: <20090211155638.GA3864@dentifrice>
User-agent: Alpine 1.10 (DEB 962 2008-03-14)

On Wed, 11 Feb 2009, mike dentifrice wrote:


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>

xfs mailing list

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.

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