# vgdisplay 
  WARNING: Failed to connect to lvmetad. Falling back to device scanning.
  Udev database has incomplete information about device /dev/loop0.
  Failed to get external handle for device /dev/loop0 [udev].
  Udev database has incomplete information about device /dev/sda.
  Failed to get external handle for device /dev/sda [udev].
  Udev database has incomplete information about device /dev/md0.
  Failed to get external handle for device /dev/md0 [udev].
  Udev database has incomplete information about device /dev/vg0/swap.
  Failed to get external handle for device /dev/vg0/swap [udev].
  Udev database has incomplete information about device /dev/loop1.
  Failed to get external handle for device /dev/loop1 [udev].
  Udev database has incomplete information about device /dev/sda1.
  Failed to get external handle for device /dev/sda1 [udev].
  Udev database has incomplete information about device /dev/vg0/root.
  Failed to get external handle for device /dev/vg0/root [udev].
  Udev database has incomplete information about device /dev/loop2.
  Failed to get external handle for device /dev/loop2 [udev].
  Udev database has incomplete information about device /dev/sda2.
  Failed to get external handle for device /dev/sda2 [udev].
  Udev database has incomplete information about device /dev/vg0/home.
  Failed to get external handle for device /dev/vg0/home [udev].
  Udev database has incomplete information about device /dev/loop3.
  Failed to get external handle for device /dev/loop3 [udev].
  Udev database has incomplete information about device /dev/sda3.
  Failed to get external handle for device /dev/sda3 [udev].
  Udev database has incomplete information about device /dev/loop4.
  Failed to get external handle for device /dev/loop4 [udev].
  Udev database has incomplete information about device /dev/sda4.
  Failed to get external handle for device /dev/sda4 [udev].
  Udev database has incomplete information about device /dev/loop5.
  Failed to get external handle for device /dev/loop5 [udev].
  Udev database has incomplete information about device /dev/sda5.
  Failed to get external handle for device /dev/sda5 [udev].
  Udev database has incomplete information about device /dev/loop6.
  Failed to get external handle for device /dev/loop6 [udev].
  Udev database has incomplete information about device /dev/loop7.
  Failed to get external handle for device /dev/loop7 [udev].
  Udev database has incomplete information about device /dev/sdb.
  Failed to get external handle for device /dev/sdb [udev].
  Udev database has incomplete information about device /dev/sdb1.
  Failed to get external handle for device /dev/sdb1 [udev].