Triple parity RAIDZ (RAIDZ3) support in ZFS

I just saw the following putback notice come over the wire:

Author: Adam Leventhal
Repository: /hg/onnv/onnv-gate
Latest revision: 17811c723fb4f9fce50616cb740a92c8f6f97651
Total changesets: 1
Log message:
6854612 triple-parity RAID-Z

This is pretty sweet, and with the introduction of 2TB+ drives, using multiple parity drives will become essential to ensuring that your data is safe when a drive failures occur.

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