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Adding another disk to a ZFS mirror

I was asked how to add a disk into a ZFS mirror today; this is an easy one:   # zpool attach [poolname] [existing disk] [new disk]   …and done! The pool will begin to resilver with the new disk as part of the existing mirror. You might want to do this to replace a part of the mirror which has been removed or is faulty, or you might want to expand a 2-way mirror to a 3-way mirror (longer MTBF for  the 3-way, beyond that it’s not worth it).

Related posts:

  1. ZFS: Adding a new mirror to an existing ZFS pool
  2. How to add a drive to a ZFS mirror
  3. ZFS: Replacing a drive with a larger drive within a vdev
  4. ZFS Basics – zpool scrubbing
Tags: mirrorZFS
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