Re: Parity Set Configuration Advice

Personally, if I had the drive space to spare, I'd go with 100% mirroring,
rather than parity groups, the way we do on our most critical (and most
drive-failure-prone) systems, here at Touchtone. That way, to lose
anything, we'd have to lose both drives of a mirrored pair, over a span of
less time than it would take to recognize the problem, swap in a
replacement, and re-establish mirroring.

Failing that (no pun intended), I'd go with more, smaller, parity groups,
just to make them more resistant to multiple drive failures. With a single
group of six drives, any 2-drive failure would shut you down, while with
two groups of three, you would have to lose two in the same parity group,
which is statistically less likely.

--
JHHL