sudo truncate --size 20G ~/cinder-volumes
sudo losetup -fv ~/cinder-volumes
sudo vgcreate cinder-volumes /dev/loop0
sudo vgdisplay cinder-volumes


also changed cinder volume driver to be LVMVolumeDriver in /etc/cinder/cinder.conf

systemctl restart openstack-cinder-volume
cinder-manage db sync
cinder-manage service-list