You mentioned that none of your snapshots have RMW in them. Can you put up a patch that adds RMW to the snapshots? Maybe someone will notice something...
It would take considerable amounts of work to get it into releasable shape, because I'd have to add RMW functionality to all the implemented algorithms -- not just the one my machine uses. However, if someone is interested in vgrepping through the source I can post the part of the diff patch that applies to raid6main.c.
I doubt it's actually wrong, though. It probably just causes worse access patterns in my particular configuration.
Did you get any data corruption with the RMW patch applied?>
No.
-hpa
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