Force parity resync on raid5?

[Philip Molter <philip@xxxxxxxxxxxxxx>]

How do I force a parity resync on a raid5 array?  Under 2.4, I would do 
this by hard cycling the box and when it came back up, it would 
automatically resync the array.  Under 2.6, this appears to have gone away.

I suspect I have parity corruption on several boxes (they run fine 
normally, but when they lose a drive, they then get corrupted) related 
to the raid5 resync bug from an older kernel.  I want to force the 
parity to reinitialize since all the data is definitely good.

Thank you for any advice.
Philip
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