OS installation by LVM partitioning:
# fdisk -l /dev/sda
...
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 499711 248832 83 Linux
/dev/sda2 501758 156301311 77899777 5 Extended
/dev/sda5 501760 156301311 77899776 8e Linux LVM
# pvdisplay
--- Physical volume ---
PV Name /dev/sda5
VG Name kvm2
PV Size 74.29 GiB / not usable 2.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 19018
Free PE 14635
Allocated PE 4383
PV UUID xxxxx
# lvdisplay
--- Logical volume ---
LV Name /dev/kvm2/root
VG Name kvm2
...
--- Logical volume ---
LV Name /dev/kvm2/swap_1
VG Name kvm2
...
# pvdisplay -m
--- Physical volume ---
PV Name /dev/sda5
VG Name kvm2
PV Size 74.29 GiB / not usable 2.00 MiB
...
--- Physical Segments ---
Physical extent 0 to 1359:
Logical volume /dev/kvm2/root
Logical extents 0 to 1359
Physical extent 1360 to 2382:
Logical volume /dev/kvm2/swap_1
Logical extents 0 to 1022
Physical extent 2383 to 4382:
Logical volume /dev/kvm2/tubu1
Logical extents 0 to 1999
Physical extent 4383 to 19017:
FREE