| The errant command which accidentally adds a vdev could just as easily
| be a command which scrambles up or erases all of the data.

 The difference between a mistaken command that accidentally adds a vdev
and the other ways to loose your data with ZFS is that the 'add a vdev'
accident is only one omitted word different from a command that you use
routinely. This is a very close distance, especially for fallible humans.

('zpool add ... mirror A B' and 'zpool add ... spare A'; omit either
'mirror' or 'spare' by accident and boom.)

        - cks
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