make exported volume groups known to the system
vgimport allows you to make a Volume Group that was previously
known to the system again, perhaps after moving its Physical Volumes
from a different machine.
vgexport clears the VG system ID, and vgimport sets the VG system ID
to match the host running vgimport (if the host has a system ID).
(8) for common options.
- -a, --all
Import all exported Volume Groups.
Import exported Volume Groups even if there are missing Physical Volumes.
This option should only be used if the missing devices are known to have
failed and they cannot be restored.