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May 20 00:18:15 atlas kernel: GEOM: mirror/gm9s1: geometry does not match label (16h,63s != 255h,63s).

$ sudo bsdlabel mirror/gm9s1
# /dev/mirror/gm9s1:
8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
  a:  1048576        0    4.2BSD        0     0     0
  b:  4194304  1048576      swap
  c: 488397105        0    unused        0     0         # "raw" part, don't edit
  d:  1048576  5242880    4.2BSD        0     0     0
  e:  4194304  6291456    4.2BSD        0     0     0
  f: 477911345 10485760    4.2BSD        0     0     0

$ gpart show
=>       63  488397042  mirror/gm9  MBR  (233G)
         63  488397105           1  freebsd  [active]  (233G)

=>        0  488397105  mirror/gm9s1  BSD  (233G)
          0    1048576             1  freebsd-ufs  (512M)
    1048576    4194304             2  freebsd-swap  (2.0G)
    5242880    1048576             4  freebsd-ufs  (512M)
    6291456    4194304             5  freebsd-ufs  (2.0G)
   10485760  477911345             6  freebsd-ufs  (228G)