How does dual parity work, actually?
I am still kinda confused, how does dual parity work. Does it really mean, that having unRAID use dual parity I could recover from ANY 2 drives failing?
Like they say, a picture is worth a thousand words...
@shEiD @johnnie.black @itimpi
Oh how we love to be comforted!
While it is true that the mathematics show you are protected from two failures, drives don't study mathematics. And they don't die like light bulbs. In the throes of death they can do nasty things, and those nasty things can pollute parity. And if it pollutes one parity, it pollutes both parties. So even saying single parity protects against one failure is not always so, but let's say it protects against 98% of
