Peter T. Breuer wrote:
b) rewriting is not necessarily idempotent, when half of it consists
of using a parity to construct what you should write.
That's right. The rewrite is not idempotent. Having lost part, or all, of either D1 or P at the time of the crash, you no longer have any accurate way of reconstructing D2.
And that's assuming you can even do a rewrite. By default, only metadata is journalled (in ext3), so for plain old data writes, you're just plain out of luck...
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