1 – reduce the filesystem. Ex: resise2fs /dev/vg0/lvol0 40G
2 – reduce the lv . ex : lvresise -L 30G logicalvol
3 – reduce the vg … etc..
lvreduce???
https://www.joomlaworks.net/blog/item/168-resizing-the-disk-space-on-ubuntu-server-vms
How To Create LVM Using vgcreate, lvcreate, and lvextend lvm2 Commands