While you're right that you don't normally want RAID-5/6 or RAIDz1/2/3 on a working array, the extra capacity, and/or extra redundancy, are ideal for a backup array. It's what I'm aiming to do at home ...
So, I've had a FreeBSD 10 setup for a while on my NAS, running RAIDZ on 6x2TB WD drives, and Mirror on 2 1TB drives for /. Strangely enough, half the RAIDZ drives and 1 of the mirror drives just seem ...
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