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RAIDframe parity rebuild (was: RAIDframe performance vs. stripe size: Test Results)
> So a parity rebuild does so by reading all the data and the
> exiting parity, computing the new parity, and then comparing the
> existing parity with the new parity. If they match, it's on to the
> next stripe. If they differ, the new parity is written out.
What's the point of not simply writing out the computed parity?
> What we don't know here is what the state of the array was when you
> started the rebuild. That is, was the parity 'mostly correct'
> beforehand? (i.e. saving having to do a lot of the writes).
I don't know either. If the discs contained a clean RAID set with a
different SPSU, was the parity correct?
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