errors while creating thin pools

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Hello. I'm use lvm 2.02.106
vgdisplay:
  --- Volume group ---
  VG Name               vg5
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  95
  VG Access             read/write
  VG Status             resizable
  MAX LV                10000
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               449.70 GiB
  PE Size               4.00 MiB
  Total PE              115124
  Alloc PE / Size       0 / 0
  Free  PE / Size       115124 / 449.70 GiB
  VG UUID               DQaAEA-uCTo-B5Sp-BZXu-6nzd-5Nz2-RMfC0t

Why i can't create thin pool with size of near 449 Gb? Command like
lvcreate -L 445G --poolmetadatasize 620M --type thin-pool --thinpool
tp5 vg5 success
but if i increase size to 447Gb i'm failing
lvcreate -L 447G --poolmetadatasize 620M --type thin-pool --thinpool tp5 vg5

Increasing pool metadata size does not helps.

-- 
Vasiliy Tolstov,
e-mail: v.tolstov@selfip.ru
jabber: vase@selfip.ru

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