LVM

Initialize partition sda5 for use by LVM:

pvcreate /dev/sda5

Create Volume Group vg0 on partition sda5:

vgcreate vg0 /dev/sda5

Create Logical Volume lv-data in Volum Group vg0:

lvcreate --size 64g vg0 --name lv-data

Reduce size of Logical Volume lv-data in Volum Group vg0 when lv-data does not contain filesystem:

lvreduce --size 16g vg0/lv-data