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xfs didn't provide redundancy for citical data structure?

To: xfs-oss <xfs@xxxxxxxxxxx>
Subject: xfs didn't provide redundancy for citical data structure?
From: hank peng <pengxihan@xxxxxxxxx>
Date: Sat, 15 May 2010 23:57:51 +0800
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I read this paper: http://pages.cs.wisc.edu/~vshree/xfs.pdf, which
says xfs didn't provide redundancy for citical data structure, such as
mirror, parity. I wonder if it is so?
If it is, is there plan to implement that for XFS developers?

-- 
The simplest is not all best but the best is surely the simplest!

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