cinder.conf:

[DEFAULT]
...
enabled_backends=standard
scheduler_driver=cinder.scheduler.filter_scheduler.FilterScheduler
default_volume_type=standard

[standard]
volume_group=standard
host = volumes
rbd_user = cinder
rbd_pool = volumes
volume_backend_name=standard
volume_driver = cinder.volume.drivers.rbd.RBDDriver
rbd_secret_uuid = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX


2015-12-15 12:18:17.981 6298 WARNING cinder.scheduler.host_manager [req-55c2e50e-abe5-413a-b5d4-400354e64f5a 946dc022de694bb6b3d6af25b8af0513 c2dfcf204c9743db9eb176373841b80a - - -] volume service is down. (host: openstack-compute-node03)
2015-12-15 12:18:17.983 6298 WARNING cinder.scheduler.host_manager [req-55c2e50e-abe5-413a-b5d4-400354e64f5a 946dc022de694bb6b3d6af25b8af0513 c2dfcf204c9743db9eb176373841b80a - - -] volume service is down. (host: openstack-compute-node02)
2015-12-15 12:18:17.984 6298 WARNING cinder.scheduler.host_manager [req-55c2e50e-abe5-413a-b5d4-400354e64f5a 946dc022de694bb6b3d6af25b8af0513 c2dfcf204c9743db9eb176373841b80a - - -] volume service is down. (host: openstack-compute-node01)
2015-12-15 12:18:17.985 6298 WARNING cinder.scheduler.host_manager [req-55c2e50e-abe5-413a-b5d4-400354e64f5a 946dc022de694bb6b3d6af25b8af0513 c2dfcf204c9743db9eb176373841b80a - - -] volume service is down. (host: volumes)
2015-12-15 12:18:17.987 6298 WARNING cinder.scheduler.filter_scheduler [req-55c2e50e-abe5-413a-b5d4-400354e64f5a 946dc022de694bb6b3d6af25b8af0513 c2dfcf204c9743db9eb176373841b80a - - -] No weighed hosts found for volume with properties: {u'name': u'standard', u'qos_specs_id': None, u'deleted': False, u'created_at': u'2015-12-15T16:44:46.000000', u'updated_at': None, u'extra_specs': {u'volume_backend_name': u'standard'}, u'is_public': True, u'deleted_at': None, u'id': u'9ab5a58e-ffab-48ee-a835-d1a8e636955e', u'description': None}
2015-12-15 12:18:17.991 6298 ERROR cinder.scheduler.flows.create_volume [req-55c2e50e-abe5-413a-b5d4-400354e64f5a 946dc022de694bb6b3d6af25b8af0513 c2dfcf204c9743db9eb176373841b80a - - -] Failed to run task cinder.scheduler.flows.create_volume.ScheduleCreateVolumeTask;volume:create: No valid host was found. No weighed hosts available