--assume-clean on raid5/6

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Hi all,

I've read in the list archives that use of --assume-clean on raid5
(raid6?) is not safe assuming the member drives are not sync, but it's
not clear to me as to why. I can see the content of an written raid5
array change if I fail a drive out of the array (created w/
--assume-clean), but data that I write prior to failing a drive remains
intact. Perhaps I'm missing something. Could somebody elaborate on the
danger/risk of using --assume-clean? Thanks in advance.

Brian
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