Home OpenStack-Ansible Installation Guide
To use the optional Block Storage (cinder) service, create an LVM volume group named cinder-volumes on the Block Storage host. A metadata size of 2048 must be specified during physical volume creation. For example:
# pvcreate --metadatasize 2048 physical_volume_device_path
# vgcreate cinder-volumes physical_volume_device_path
Optionally, create an LVM volume group named lxc for container file systems. If the lxc volume group does not exist, containers will be automatically installed into the file system under /var/lib/lxc by default.