To retrieve volume samples, you must configure the Block Storage service to send notifications to the bus.
Edit
/etc/cinder/cinder.conf
and add in the[DEFAULT]
section on the controller and volume nodes:control_exchange = cinder notification_driver = cinder.openstack.common.notifier.rpc_notifier
Restart the Block Storage services with their new settings.
On the controller node:
# service cinder-api restart # service cinder-scheduler restart
On the volume node:
# service cinder-volume restart