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If you have cinder installed in that node, you need to create a pv in that disk, then add it to the existing cinder-volumes volume group with vgextend (see http://docs.openstack.org/juno/install-guide/install/apt-debian/content/cinder-install-storage-node.html and http://rgheck.blogspot.com/2012/07/how-to-add-to-lvm-drive.html).

That works if you want to add additional volumes to your virtual machines.

If you are asking about the primary disk for virtual machines, they typically go in /var/lib/nova/instances. Likewise you can simply add that disk to whatever volume group contains /var/lib/nova/instances and then use lvextend, and resize2fs. Or you could format a new filesystem and mount /var/lib/nova/instances in the new disk.