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Re: xfs mount/create options (was: XFS status update for August 2010)

To: xfs@xxxxxxxxxxx
Subject: Re: xfs mount/create options (was: XFS status update for August 2010)
From: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 9 Sep 2010 01:30:15 +0200
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
In-reply-to: <20100908145148.GB705@dastard>
Organization: it-management http://it-management.at
References: <20100902145959.GA27887@xxxxxxxxxxxxx> <201009081538.54488@xxxxxx> <20100908145148.GB705@dastard>
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On Mittwoch, 8. September 2010 Dave Chinner wrote:
> Dynamically changing the RAID array geometry is a Bad Idea.  Yes,
> you can do it, but if you've got a filesystem full of data and
> metadata aligned to the old geometry then after the modification
> it won't be aligned anymore.
> 
> If you want to do this, then either don't bother about geomtry hints
> in the first place, or dump, rebuild the array, mkfs and restore so
> everything is properly aligned with the new world order. Hell,
> dump/mkfs/restore might even be faster than reshaping a large
> array...
 
You're right. But there are some customers who don't want to spend the 
money for a 2nd array, and can't afford the downtime of backup, rebuild 
raid (takes 8-48 hours), restore. So an online upgrade is needed. We're 
not in an ideal world.

-- 
mit freundlichen Grüssen,
Michael Monnerie, Ing. BSc

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