1 - Shrink logical volume secondlv on volume group testvg from 15.00 GiB to 2.50 GiB -> 3 4
2 - Create physical volume on /dev/sdb4 -> 3
3 - Add /dev/sdb4 to testvg -> 6 7
4 - Remove /dev/sdb3 from testvg -> 5 6 7
5 - Delete physical volume on /dev/sdb3 ->
6 - Grow logical volume firstlv on volume group testvg from 15.00 GiB to 20.00 GiB ->
7 - Create logical volume newlv (2.50 GiB) on volume group testvg ->
