On Friday, March 02, 2012 04:18:48 PM Digimer wrote: > 10 (one-zero) == a mirror of two stripped arrays. You can lose up to two > drives, so long as they are both from the same strip set. You really don't want a mirror of two striped arrays; you want a striped array of mirrors. A striped array of mirrors is much more resilient to multiple drive failures than a mirrored set of striped arrays. See http://www.linux-mag.com/id/7928/?hq_e=el&hq_m=1151565&hq_l=36&hq_v=3fa9646c7f What you're describing is RAID01, not RAID10.