Don't use ataraid/pseudo-raid for anything except mirroring. In fact, don't use it for anything at all. Instead, either use gmirror/graid3 or use zfs. Just avoid pseudo-raid at all costs. You *will* lose data using pseudo-raid. Especially if you have any RAID levels higher than 1 (the ataraid driver doesn't actually do raid5, it's raid0 under the hood, lose 1 disk, lose the array).
And, if you are going to use zfs, than why would you use the pseudo-raid underneath? Give zfs the whole disk, and let it manage the redundancy.
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