Gpart: Adding mirror to existing zpool

[Beeblebrox]

Hi, Warren.

Currently  my partition setup (excluding ada0). 4k alligned as you can see:
=>       34  976773101  ada1  GPT  (466G)
         34          6        - free -  (3.0K)
         40    8388608     1  freebsd-swap  (4.0G)
    8388648  159383552     3  freebsd-zfs  (76G)
  167772200  809000928     2  freebsd-zfs  (386G)
  976773128          7        - free -  (3.5K)
=>        40  1953525088  ada2  GPT  (932G)
          40    12582912     1  freebsd-swap  (6.0G)
    12582952   209715200     3  freebsd-zfs  (100G)
   222298152  1731226976        - free -  (826G)

* ada1p3 and ada2p3 are the same pool as simple jbod (non-issue)
* ada2p2 is what I want to mirror on ada2p2
# gpart show -pr ada1 =>   167772200  809000928  ada1p2 (386G)
809000928 - 167772200 = 641228728
# gpart add -a 4k -s 641228728 -i 2 ada2
# gpart show ada2 =>   2  freebsd-zfs  ada2p2 (376G)  = 10G less than ada1p2




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FreeBSD-11-current_amd64_root-on-zfs_RadeonKMS
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