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From: Christoph Hellwig <hch@infradead.org>
Subject: Re: 2.6.36 io bring the system to its knees
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> I'm not sure if "data=writeback" (makes ext4 journaling similar to
> XFS) really fixes the problem

It doesn't.  XFS does not expose stale data after a crash, while ext3/4
data=writeback does.

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