====== Expanding Cinder Volume Pool ======

  - service cinder-scheduler stop
  - service cinder-volume stop
  - pvresize /dev/sdc
  - vgdisplay (check that cinder-volumes vg has automatically expanded)
  - lvextend -l +100%FREE  /dev/cinder-volumes/cinder-volumes-pool
  - service cinder-scheduler start
  - service cinder-volume start