Erik Trimble wrote:
From a global perspective, multi-disk parity (e.g. raidz2 or raidz3) is the way to go instead of hot spares. Hot spares are useful for adding protection to a number of vdevs, not a single vdev.

Even when using raidz2 or 3, it is useful to have hot spares so that reconstruction can begin immediately. Otherwise it would have to wait for the operator to physically remove the failed disk and insert a new one.

--matt
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