Hi,
What wrong with my command line? Please help.
OR
This is a bug?

linux-server:/ # vgdisplay
  --- Volume group ---
  VG Name               gdata
  System ID
  Format                lvm2
  Metadata Areas        3
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                3
  Act PV                3
  VG Size               544.62 GB
  PE Size               4.00 MB
  Total PE              139424
  Alloc PE / Size       100148 / 391.20 GB
  Free  PE / Size       39276 / 153.42 GB
  VG UUID               gROPCK-xUmS-Tk99-nTmp-S63F-otHE-9QJukD
-------------------------------------------------------------
/////// So I have 153.42 GB free space NOW
-------------------------------------------------------------
linux-server:/ # lvextend -L +100G /dev/gdata/priv
  Extending logical volume priv to 177.80 GB
  Insufficient free space: 45517 extents needed, but only 39276 available

Thank you.