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Everything that matters about vdev size and configuration is explained here, complete with charts that indicate the actual overhead of different arrangements: http://blog.delphix.com/matt/2014/06/06/zfs-stripe-width/

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That's a very good article on that topic indeed. But in some way it's sad that you even have to think about this with ZFS. It seems that this is not or way less of an issue with BTRFS (or the magic unicorn file system that is still not there).

As the author of that article, thank you. And, I agree it would be sad if you had to think about exactly how many drives are in a RAID-Z group. The entire point of my blog post is that you do not have to think about it.

"TL;DR: Choose a RAID-Z stripe width based on your IOPS needs and the amount of space you are willing to devote to parity information. Trying to optimize your RAID-Z stripe width based on exact numbers is irrelevant in nearly all cases."

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