September 9, 20178 yr Single parity seems to be a very easy concept, and I can run through theoretical failures in my head to understand how it works, but that second parity is making no sense to me. I trust it works, and I have dual parity in my array, but I'm curious how the actual math works, especially how rebuilding occurs in a dual disk failure situation.
September 9, 20178 yr Not 100% if this is the exact method that unRaid uses, but it'll give a good basis on the math http://igoro.com/archive/how-raid-6-dual-parity-calculation-works/
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