converting a Logical Volume to a Thin Pool fails with insufficient free space

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Issue

Converting a Logical Volume to a Thin Pool fails with insufficient free space

# lvconvert --thinpool vgname/thinpool --poolmetadata vgname/metadata
  Volume group "vgname" has insufficient free space (0 extents): 127 required.

Environment

Red Hat Enterprise Linux 6.3+
Red Hat Enterprise Linux 7
Red Hat Gluster Storage

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