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Did you not read the other guys link above? http://jrs-s.net/2015/02/06/zfs-you-should-use-mirror-vdevs-...

It says "Fault tolerance / degraded performance

Be careful here. Keep in mind that if any single vdev fails, the entire pool fails with it. There is no fault tolerance at the pool level, only at the individual vdev level!"

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I've been architecting and implementing highly fault tolerant, large scale storage solutions with ZFS since one week after it came out at end of June 2006, but thank you, I'll be extra sure to keep that in mind.

Please do not assume that everyone here comes from GNU/Linux and knows next to nothing or half-true anecdotes about (Open)ZFS. For example, I learned what and how in ZFS directly from the ZFS development team at Sun Microsystems: Roch Burbonnais, Adam Leventhal, Eric Shrock, and Jeff Bonwick.

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