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There's also the problem that you can't grow a raidz vdev by adding disks. I can just imagine Apple support trying to explain that one.

• lmm 10y ago
  In Solaris ZFS you can now AIUI - it's just that hasn't made it into the open-source version.
• xenophonf 10y ago
  That's true, but you can grow a pool by progressively replacing smaller disks with larger disks.