xenserver:~# vgdisplay
  --- Volume group ---
  VG Name               vm
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  23
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               4
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               149.00 GiB
  PE Size               4.00 MiB
  Total PE              38144
  Alloc PE / Size       20608 / 80.50 GiB
  Free  PE / Size       17536 / 68.50 GiB
  VG UUID               yeTGKv-aJti-D05q-Uj2p-se6l-Bn5m-HrtqKz