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CInder create volume with volume tye extra specs gives error

I am trying to create a volume with volume type with extra spec capabilites:replication <is>True ,but I get this error in cinder scheduler : 2014-12-12 12:31:51.726 12871 WARNING cinder.scheduler.filter_scheduler [req-fcc8c007-3d70-4eab-a280-f875c57b68e0 ae4ec04f42004f8ead92395b2f5cec36 58211a6f6af84395a46eff1551564eaa - - -] No weighed hosts found for volume with properties: {u'name': u'replica', u'qos_specs_id': None, u'deleted': False, u'created_at': u'2014-12-11T17:52:09.000000', u'updated_at': None, u'extra_specs': {u'volume_backend_name': u' ', u'capabilities:replication': u'<is>True'}, u'deleted_at': None, u'id': u'9d47c947-ca04-40df-980d-f643ce5d8cdd'} 2014-12-12 12:31:51.740 12871 ERROR cinder.scheduler.flows.create_volume [req-fcc8c007-3d70-4eab-a280-f875c57b68e0 ae4ec04f42004f8ead92395b2f5cec36 58211a6f6af84395a46eff1551564eaa - - -] Failed to run task cinder.scheduler.flows.create_volume.ScheduleCreateVolumeTask;volume:create: No valid host was found. No weighed hosts available

am I missing some thing ,or is there any configuration required for hosts and if yes can anyone assist regarding the same ?

CInder create volume with volume tye extra specs gives error

I am trying to create a volume with volume type with extra spec capabilites:replication <is>True ,but I get this error in cinder scheduler : :

2014-12-12 12:31:51.726 12871 WARNING cinder.scheduler.filter_scheduler [req-fcc8c007-3d70-4eab-a280-f875c57b68e0 ae4ec04f42004f8ead92395b2f5cec36 58211a6f6af84395a46eff1551564eaa - - -] No weighed hosts found for volume with properties: {u'name': u'replica', u'qos_specs_id': None, u'deleted': False, u'created_at': u'2014-12-11T17:52:09.000000', u'updated_at': None, u'extra_specs': {u'volume_backend_name': u' ', u'capabilities:replication': u'<is>True'}, u'deleted_at': None, u'id': u'9d47c947-ca04-40df-980d-f643ce5d8cdd'}
2014-12-12 12:31:51.740 12871 ERROR cinder.scheduler.flows.create_volume [req-fcc8c007-3d70-4eab-a280-f875c57b68e0 ae4ec04f42004f8ead92395b2f5cec36 58211a6f6af84395a46eff1551564eaa - - -] Failed to run task cinder.scheduler.flows.create_volume.ScheduleCreateVolumeTask;volume:create: No valid host was found. No weighed hosts available

available

am I missing some thing ,or is there any configuration required for hosts and if yes can anyone assist regarding the same ?