with "lsvg vgname" as say johnf , you can see some informations about vg configuration , like size of physical partitions , allocated and free partitions , stale partitions ecc ecc .....

with "lsvg -l vgname" , you can see the all logical volume inside the vg .

with "lsvg -p vgname" , you can see physycal volume assigned to this vg .