$ vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "vg0" using metadata type lvm2
$ vgs
  VG   #PV #LV #SN Attr   VSize  VFree
  vg0    1   2   0 wz--n- 29.90g    0 
$ lvscan
  inactive          '/dev/vg0/swap' [1.86 GiB] inherit
  inactive          '/dev/vg0/root' [28.04 GiB] inherit