Revisiting "too small to fail"

That's not as much of a problem as I thought it was. raid6check does what's necessary (it's just, uh, not installed by default). Frankly, I'm happy to wait for the immensely rare occasion when mismatch_cnt rises above 0 on a RAID-6 array and then run raid6check on it: complete automation of events as rare as that isn't terribly important to me. (But maybe it is for others...)