diff --git a/cinder/cmd/manage.py b/cinder/cmd/manage.py
index b430c6e597a..85d5c03e110 100644
--- a/cinder/cmd/manage.py
+++ b/cinder/cmd/manage.py
@@ -85,7 +85,7 @@ from cinder import rpc
 from cinder.scheduler import rpcapi as scheduler_rpcapi
 from cinder import version
 from cinder.volume import rpcapi as volume_rpcapi
-from cinder.volume import volume_utils as vutils
+from cinder.volume import volume_utils
 
 
 CONF = cfg.CONF
@@ -444,7 +444,7 @@ class VolumeCommands(object):
         """Delete a volume, bypassing the check that it must be available."""
         ctxt = context.get_admin_context()
         volume = objects.Volume.get_by_id(ctxt, volume_id)
-        host = vutils.extract_host(volume.host) if volume.host else None
+        host = volume_utils.extract_host(volume.host) if volume.host else None
 
         if not host:
             print(_("Volume not yet assigned to host."))
diff --git a/cinder/db/sqlalchemy/api.py b/cinder/db/sqlalchemy/api.py
index 3cfeb611733..b1e6d23ea8d 100644
--- a/cinder/db/sqlalchemy/api.py
+++ b/cinder/db/sqlalchemy/api.py
@@ -66,7 +66,7 @@ from cinder.i18n import _
 from cinder import objects
 from cinder.objects import fields
 from cinder import utils
-from cinder.volume import volume_utils as vol_utils
+from cinder.volume import volume_utils
 
 CONF = cfg.CONF
 LOG = logging.getLogger(__name__)
@@ -577,10 +577,10 @@ def is_backend_frozen(context, host, cluster_name):
     """Check if a storage backend is frozen based on host and cluster_name."""
     if cluster_name:
         model = models.Cluster
-        conditions = [model.name == vol_utils.extract_host(cluster_name)]
+        conditions = [model.name == volume_utils.extract_host(cluster_name)]
     else:
         model = models.Service
-        conditions = [model.host == vol_utils.extract_host(host)]
+        conditions = [model.host == volume_utils.extract_host(host)]
     conditions.extend((~model.deleted, model.frozen))
     query = get_session().query(sql.exists().where(and_(*conditions)))
     frozen = query.scalar()
diff --git a/cinder/group/api.py b/cinder/group/api.py
index 5fb284bd427..5b184c1bd0a 100644
--- a/cinder/group/api.py
+++ b/cinder/group/api.py
@@ -40,7 +40,7 @@ from cinder.scheduler import rpcapi as scheduler_rpcapi
 from cinder.volume import api as volume_api
 from cinder.volume import rpcapi as volume_rpcapi
 from cinder.volume import volume_types
-from cinder.volume import volume_utils as vol_utils
+from cinder.volume import volume_utils
 
 
 CONF = cfg.CONF
@@ -785,8 +785,8 @@ class API(base.Base):
                 # group.host and add_vol_ref['host'] are in this format:
                 # 'host@backend#pool'. Extract host (host@backend) before
                 # doing comparison.
-                vol_host = vol_utils.extract_host(add_vol_ref['host'])
-                group_host = vol_utils.extract_host(group.host)
+                vol_host = volume_utils.extract_host(add_vol_ref['host'])
+                group_host = volume_utils.extract_host(group.host)
                 if group_host != vol_host:
                     raise exception.InvalidVolume(
                         reason=_("Volume is not local to this node."))
@@ -956,7 +956,7 @@ class API(base.Base):
             raise exception.InvalidGroupType(reason=msg)
 
         for vol_type in group.volume_types:
-            if not vol_utils.is_replicated_spec(vol_type.extra_specs):
+            if not volume_utils.is_replicated_spec(vol_type.extra_specs):
                 msg = _("Volume type %s does not have 'replication_enabled' "
                         "spec key set to '<is> True'.") % vol_type.id
                 LOG.error(msg)
diff --git a/cinder/scheduler/filter_scheduler.py b/cinder/scheduler/filter_scheduler.py
index bdb1eb02003..d4969a4f772 100644
--- a/cinder/scheduler/filter_scheduler.py
+++ b/cinder/scheduler/filter_scheduler.py
@@ -28,7 +28,7 @@ from cinder import exception
 from cinder.i18n import _
 from cinder.scheduler import driver
 from cinder.scheduler import scheduler_options
-from cinder.volume import volume_utils as utils
+from cinder.volume import volume_utils
 
 CONF = cfg.CONF
 LOG = logging.getLogger(__name__)
@@ -117,11 +117,11 @@ class FilterScheduler(driver.Scheduler):
         weighed_backends = self._get_weighted_candidates(context, request_spec,
                                                          filter_properties)
         # If backend has no pool defined we will ignore it in the comparison
-        ignore_pool = not bool(utils.extract_host(backend, 'pool'))
+        ignore_pool = not bool(volume_utils.extract_host(backend, 'pool'))
         for weighed_backend in weighed_backends:
             backend_id = weighed_backend.obj.backend_id
             if ignore_pool:
-                backend_id = utils.extract_host(backend_id)
+                backend_id = volume_utils.extract_host(backend_id)
             if backend_id == backend:
                 return weighed_backend.obj
 
@@ -160,7 +160,7 @@ class FilterScheduler(driver.Scheduler):
             if backend_state.backend_id == backend:
                 return backend_state
 
-        if utils.extract_host(backend, 'pool') is None:
+        if volume_utils.extract_host(backend, 'pool') is None:
             # legacy volumes created before pool is introduced has no pool
             # info in host.  But host_state.host always include pool level
             # info. In this case if above exact match didn't work out, we
@@ -171,8 +171,9 @@ class FilterScheduler(driver.Scheduler):
             # to happen even migration policy is 'never'.
             for weighed_backend in weighed_backends:
                 backend_state = weighed_backend.obj
-                new_backend = utils.extract_host(backend_state.backend_id,
-                                                 'backend')
+                new_backend = volume_utils.extract_host(
+                    backend_state.backend_id,
+                    'backend')
                 if new_backend == backend:
                     return backend_state
 
@@ -447,8 +448,8 @@ class FilterScheduler(driver.Scheduler):
             for backend2 in backend_list2:
                 # Should schedule creation of group on backend level,
                 # not pool level.
-                if (utils.extract_host(backend1.obj.backend_id) ==
-                        utils.extract_host(backend2.obj.backend_id)):
+                if (volume_utils.extract_host(backend1.obj.backend_id) ==
+                        volume_utils.extract_host(backend2.obj.backend_id)):
                     new_backends.append(backend1)
         if not new_backends:
             return []
@@ -526,14 +527,14 @@ class FilterScheduler(driver.Scheduler):
         # snapshot or volume).
         resource_backend = request_spec.get('resource_backend')
         if weighed_backends and resource_backend:
-            resource_backend_has_pool = bool(utils.extract_host(
+            resource_backend_has_pool = bool(volume_utils.extract_host(
                 resource_backend, 'pool'))
             # Get host name including host@backend#pool info from
             # weighed_backends.
             for backend in weighed_backends[::-1]:
                 backend_id = (
                     backend.obj.backend_id if resource_backend_has_pool
-                    else utils.extract_host(backend.obj.backend_id)
+                    else volume_utils.extract_host(backend.obj.backend_id)
                 )
                 if backend_id != resource_backend:
                     weighed_backends.remove(backend)
diff --git a/cinder/scheduler/host_manager.py b/cinder/scheduler/host_manager.py
index 2eb56ffe5e2..f7500265b72 100644
--- a/cinder/scheduler/host_manager.py
+++ b/cinder/scheduler/host_manager.py
@@ -35,7 +35,7 @@ from cinder import objects
 from cinder.scheduler import filters
 from cinder import utils
 from cinder.volume import volume_types
-from cinder.volume import volume_utils as vol_utils
+from cinder.volume import volume_utils
 
 
 # FIXME: This file should be renamed to backend_manager, we should also rename
@@ -246,7 +246,7 @@ class BackendState(object):
             pool_name = self.volume_backend_name
             if pool_name is None:
                 # To get DEFAULT_POOL_NAME
-                pool_name = vol_utils.extract_host(self.host, 'pool', True)
+                pool_name = volume_utils.extract_host(self.host, 'pool', True)
 
             if len(self.pools) == 0:
                 # No pool was there
@@ -349,8 +349,8 @@ class BackendState(object):
 
 class PoolState(BackendState):
     def __init__(self, host, cluster_name, capabilities, pool_name):
-        new_host = vol_utils.append_host(host, pool_name)
-        new_cluster = vol_utils.append_host(cluster_name, pool_name)
+        new_host = volume_utils.append_host(host, pool_name)
+        new_cluster = volume_utils.append_host(cluster_name, pool_name)
         super(PoolState, self).__init__(new_host, new_cluster, capabilities)
         self.pool_name = pool_name
         # No pools in pool
@@ -726,7 +726,8 @@ class HostManager(object):
                 filtered = False
                 pool = state.pools[key]
                 # use backend_key.pool_name to make sure key is unique
-                pool_key = vol_utils.append_host(backend_key, pool.pool_name)
+                pool_key = volume_utils.append_host(backend_key,
+                                                    pool.pool_name)
                 new_pool = dict(name=pool_key)
                 new_pool.update(dict(capabilities=pool.capabilities))
 
@@ -871,7 +872,7 @@ class HostManager(object):
     def _notify_capacity_usage(self, context, usage):
         if usage:
             for u in usage:
-                vol_utils.notify_about_capacity_usage(
+                volume_utils.notify_about_capacity_usage(
                     context, u, u['type'], None, None)
         LOG.debug("Publish storage capacity: %s.", usage)
 
diff --git a/cinder/tests/unit/scheduler/fakes.py b/cinder/tests/unit/scheduler/fakes.py
index c39304ca1bb..e8f8388055c 100644
--- a/cinder/tests/unit/scheduler/fakes.py
+++ b/cinder/tests/unit/scheduler/fakes.py
@@ -22,7 +22,7 @@ from oslo_utils import uuidutils
 
 from cinder.scheduler import filter_scheduler
 from cinder.scheduler import host_manager
-from cinder.volume import volume_utils as utils
+from cinder.volume import volume_utils
 
 
 UTC_NOW = timeutils.utcnow()
@@ -301,7 +301,8 @@ def mock_host_manager_db_calls(mock_obj, backends_with_pools=False,
             {
                 'id': sid,
                 'host': svc,
-                'availability_zone': az_map[utils.extract_host(svc, 'host')],
+                'availability_zone': az_map[volume_utils.extract_host(svc,
+                                                                      'host')],
                 'topic': 'volume',
                 'disabled': False,
                 'updated_at': timeutils.utcnow(),
diff --git a/cinder/tests/unit/scheduler/test_allocated_capacity_weigher.py b/cinder/tests/unit/scheduler/test_allocated_capacity_weigher.py
index 4ed90fe99fc..d871a8dde50 100644
--- a/cinder/tests/unit/scheduler/test_allocated_capacity_weigher.py
+++ b/cinder/tests/unit/scheduler/test_allocated_capacity_weigher.py
@@ -24,7 +24,7 @@ from cinder import context
 from cinder.scheduler import weights
 from cinder import test
 from cinder.tests.unit.scheduler import fakes
-from cinder.volume import volume_utils as utils
+from cinder.volume import volume_utils
 
 
 class AllocatedCapacityWeigherTestCase(test.TestCase):
@@ -66,7 +66,7 @@ class AllocatedCapacityWeigherTestCase(test.TestCase):
         weighed_host = self._get_weighed_host(hostinfo_list)
         self.assertEqual(0.0, weighed_host.weight)
         self.assertEqual(
-            'host1', utils.extract_host(weighed_host.obj.host))
+            'host1', volume_utils.extract_host(weighed_host.obj.host))
 
     def test_capacity_weight_multiplier1(self):
         self.flags(allocated_capacity_weight_multiplier=1.0)
@@ -82,7 +82,7 @@ class AllocatedCapacityWeigherTestCase(test.TestCase):
         weighed_host = self._get_weighed_host(hostinfo_list)
         self.assertEqual(1.0, weighed_host.weight)
         self.assertEqual(
-            'host4', utils.extract_host(weighed_host.obj.host))
+            'host4', volume_utils.extract_host(weighed_host.obj.host))
 
     def test_capacity_weight_multiplier2(self):
         self.flags(allocated_capacity_weight_multiplier=-2.0)
@@ -98,4 +98,4 @@ class AllocatedCapacityWeigherTestCase(test.TestCase):
         weighed_host = self._get_weighed_host(hostinfo_list)
         self.assertEqual(0.0, weighed_host.weight)
         self.assertEqual(
-            'host1', utils.extract_host(weighed_host.obj.host))
+            'host1', volume_utils.extract_host(weighed_host.obj.host))
diff --git a/cinder/tests/unit/scheduler/test_capacity_weigher.py b/cinder/tests/unit/scheduler/test_capacity_weigher.py
index f93e7148179..6cc8c394d66 100644
--- a/cinder/tests/unit/scheduler/test_capacity_weigher.py
+++ b/cinder/tests/unit/scheduler/test_capacity_weigher.py
@@ -25,7 +25,7 @@ from cinder import context
 from cinder.scheduler import weights
 from cinder import test
 from cinder.tests.unit.scheduler import fakes
-from cinder.volume import volume_utils as utils
+from cinder.volume import volume_utils
 
 
 @ddt.ddt
@@ -109,7 +109,8 @@ class CapacityWeigherTestCase(test.TestCase):
             backend_info_list,
             weight_properties=weight_properties)[0]
         self.assertEqual(1.0, weighed_host.weight)
-        self.assertEqual(winner, utils.extract_host(weighed_host.obj.host))
+        self.assertEqual(winner,
+                         volume_utils.extract_host(weighed_host.obj.host))
 
     @ddt.data(
         {'volume_type': {'extra_specs': {'provisioning:type': 'thin'}},
@@ -158,7 +159,8 @@ class CapacityWeigherTestCase(test.TestCase):
             weight_properties=weight_properties)
         weighed_host = weighed_host[0]
         self.assertEqual(0.0, weighed_host.weight)
-        self.assertEqual(winner, utils.extract_host(weighed_host.obj.host))
+        self.assertEqual(winner,
+                         volume_utils.extract_host(weighed_host.obj.host))
 
     @ddt.data(
         {'volume_type': {'extra_specs': {'provisioning:type': 'thin'}},
@@ -206,7 +208,8 @@ class CapacityWeigherTestCase(test.TestCase):
             backend_info_list,
             weight_properties=weight_properties)[0]
         self.assertEqual(1.0 * 2, weighed_host.weight)
-        self.assertEqual(winner, utils.extract_host(weighed_host.obj.host))
+        self.assertEqual(winner,
+                         volume_utils.extract_host(weighed_host.obj.host))
 
     def test_capacity_weight_no_unknown_or_infinite(self):
         self.flags(capacity_weight_multiplier=-1.0)
@@ -233,11 +236,13 @@ class CapacityWeigherTestCase(test.TestCase):
         weighed_hosts = self._get_weighed_hosts(backend_info_list)
         best_host = weighed_hosts[0]
         self.assertEqual(0.0, best_host.weight)
-        self.assertEqual('host4', utils.extract_host(best_host.obj.host))
+        self.assertEqual('host4',
+                         volume_utils.extract_host(best_host.obj.host))
         # and host2 is the worst:
         worst_host = weighed_hosts[-1]
         self.assertEqual(-1.0, worst_host.weight)
-        self.assertEqual('host2', utils.extract_host(worst_host.obj.host))
+        self.assertEqual('host2',
+                         volume_utils.extract_host(worst_host.obj.host))
 
     def test_capacity_weight_free_unknown(self):
         self.flags(capacity_weight_multiplier=-1.0)
@@ -275,11 +280,13 @@ class CapacityWeigherTestCase(test.TestCase):
         weighed_hosts = self._get_weighed_hosts(backend_info_list)
         best_host = weighed_hosts[0]
         self.assertEqual(0.0, best_host.weight)
-        self.assertEqual('host4', utils.extract_host(best_host.obj.host))
+        self.assertEqual('host4',
+                         volume_utils.extract_host(best_host.obj.host))
         # and host5 is the worst:
         worst_host = weighed_hosts[-1]
         self.assertEqual(-1.0, worst_host.weight)
-        self.assertEqual('host5', utils.extract_host(worst_host.obj.host))
+        self.assertEqual('host5',
+                         volume_utils.extract_host(worst_host.obj.host))
 
     def test_capacity_weight_cap_unknown(self):
         self.flags(capacity_weight_multiplier=-1.0)
@@ -317,11 +324,13 @@ class CapacityWeigherTestCase(test.TestCase):
         weighed_hosts = self._get_weighed_hosts(backend_info_list)
         best_host = weighed_hosts[0]
         self.assertEqual(0.0, best_host.weight)
-        self.assertEqual('host4', utils.extract_host(best_host.obj.host))
+        self.assertEqual('host4',
+                         volume_utils.extract_host(best_host.obj.host))
         # and host5 is the worst:
         worst_host = weighed_hosts[-1]
         self.assertEqual(-1.0, worst_host.weight)
-        self.assertEqual('host5', utils.extract_host(worst_host.obj.host))
+        self.assertEqual('host5',
+                         volume_utils.extract_host(worst_host.obj.host))
 
     def test_capacity_weight_free_infinite(self):
         self.flags(capacity_weight_multiplier=-1.0)
@@ -359,11 +368,13 @@ class CapacityWeigherTestCase(test.TestCase):
         weighed_hosts = self._get_weighed_hosts(backend_info_list)
         best_host = weighed_hosts[0]
         self.assertEqual(0.0, best_host.weight)
-        self.assertEqual('host4', utils.extract_host(best_host.obj.host))
+        self.assertEqual('host4',
+                         volume_utils.extract_host(best_host.obj.host))
         # and host5 is the worst:
         worst_host = weighed_hosts[-1]
         self.assertEqual(-1.0, worst_host.weight)
-        self.assertEqual('host5', utils.extract_host(worst_host.obj.host))
+        self.assertEqual('host5',
+                         volume_utils.extract_host(worst_host.obj.host))
 
     def test_capacity_weight_cap_infinite(self):
         self.flags(capacity_weight_multiplier=-1.0)
@@ -401,8 +412,10 @@ class CapacityWeigherTestCase(test.TestCase):
         weighed_hosts = self._get_weighed_hosts(backend_info_list)
         best_host = weighed_hosts[0]
         self.assertEqual(0.0, best_host.weight)
-        self.assertEqual('host4', utils.extract_host(best_host.obj.host))
+        self.assertEqual('host4',
+                         volume_utils.extract_host(best_host.obj.host))
         # and host5 is the worst:
         worst_host = weighed_hosts[-1]
         self.assertEqual(-1.0, worst_host.weight)
-        self.assertEqual('host5', utils.extract_host(worst_host.obj.host))
+        self.assertEqual('host5',
+                         volume_utils.extract_host(worst_host.obj.host))
diff --git a/cinder/tests/unit/scheduler/test_filter_scheduler.py b/cinder/tests/unit/scheduler/test_filter_scheduler.py
index 70a58856cd0..d836c6377e0 100644
--- a/cinder/tests/unit/scheduler/test_filter_scheduler.py
+++ b/cinder/tests/unit/scheduler/test_filter_scheduler.py
@@ -27,7 +27,7 @@ from cinder.scheduler import host_manager
 from cinder.tests.unit import fake_constants as fake
 from cinder.tests.unit.scheduler import fakes
 from cinder.tests.unit.scheduler import test_scheduler
-from cinder.volume import volume_utils as utils
+from cinder.volume import volume_utils
 
 
 @ddt.ddt
@@ -379,7 +379,7 @@ class FilterSchedulerTestCase(test_scheduler.SchedulerTestCase):
         request_spec = objects.RequestSpec.from_primitives(request_spec)
         ret_host = sched.backend_passes_filters(ctx, 'host1#lvm1',
                                                 request_spec, {})
-        self.assertEqual('host1', utils.extract_host(ret_host.host))
+        self.assertEqual('host1', volume_utils.extract_host(ret_host.host))
         self.assertTrue(_mock_service_get_topic.called)
 
     @mock.patch('cinder.db.service_get_all')
@@ -395,7 +395,7 @@ class FilterSchedulerTestCase(test_scheduler.SchedulerTestCase):
         request_spec = objects.RequestSpec.from_primitives(request_spec)
         ret_host = sched.backend_passes_filters(ctx, 'host5#_pool0',
                                                 request_spec, {})
-        self.assertEqual('host5', utils.extract_host(ret_host.host))
+        self.assertEqual('host5', volume_utils.extract_host(ret_host.host))
         self.assertTrue(_mock_service_get_topic.called)
 
     @mock.patch('cinder.db.service_get_all')
@@ -408,7 +408,7 @@ class FilterSchedulerTestCase(test_scheduler.SchedulerTestCase):
                                               'size': 1}}
         request_spec = objects.RequestSpec.from_primitives(request_spec)
         ret_host = sched.backend_passes_filters(ctx, 'host1', request_spec, {})
-        self.assertEqual('host1', utils.extract_host(ret_host.host))
+        self.assertEqual('host1', volume_utils.extract_host(ret_host.host))
         self.assertTrue(mock_service_get_all.called)
 
     @mock.patch('cinder.db.service_get_all')
@@ -481,7 +481,7 @@ class FilterSchedulerTestCase(test_scheduler.SchedulerTestCase):
         host_state = sched.find_retype_backend(ctx, request_spec,
                                                filter_properties={},
                                                migration_policy='never')
-        self.assertEqual('host4', utils.extract_host(host_state.host))
+        self.assertEqual('host4', volume_utils.extract_host(host_state.host))
 
     @mock.patch('cinder.db.service_get_all')
     def test_retype_with_pool_policy_never_migrate_pass(
@@ -540,7 +540,7 @@ class FilterSchedulerTestCase(test_scheduler.SchedulerTestCase):
         host_state = sched.find_retype_backend(ctx, request_spec,
                                                filter_properties={},
                                                migration_policy='on-demand')
-        self.assertEqual('host1', utils.extract_host(host_state.host))
+        self.assertEqual('host1', volume_utils.extract_host(host_state.host))
 
     @mock.patch('cinder.db.service_get_all')
     def test_retype_policy_demand_migrate_fail(self, _mock_service_get_topic):
diff --git a/cinder/tests/unit/volume/test_init_host.py b/cinder/tests/unit/volume/test_init_host.py
index ab0cbf31954..26e917bc6cd 100644
--- a/cinder/tests/unit/volume/test_init_host.py
+++ b/cinder/tests/unit/volume/test_init_host.py
@@ -26,7 +26,7 @@ from cinder.tests.unit import utils as tests_utils
 from cinder.tests.unit import volume as base
 from cinder.volume import driver
 from cinder.volume import volume_migration as volume_migration
-from cinder.volume import volume_utils as volutils
+from cinder.volume import volume_utils
 
 
 CONF = cfg.CONF
@@ -44,16 +44,16 @@ class VolumeInitHostTestCase(base.BaseVolumeTestCase):
             self.context, size=100, host=CONF.host)
         vol1 = tests_utils.create_volume(
             self.context, size=128,
-            host=volutils.append_host(CONF.host, 'pool0'))
+            host=volume_utils.append_host(CONF.host, 'pool0'))
         vol2 = tests_utils.create_volume(
             self.context, size=256,
-            host=volutils.append_host(CONF.host, 'pool0'))
+            host=volume_utils.append_host(CONF.host, 'pool0'))
         vol3 = tests_utils.create_volume(
             self.context, size=512,
-            host=volutils.append_host(CONF.host, 'pool1'))
+            host=volume_utils.append_host(CONF.host, 'pool1'))
         vol4 = tests_utils.create_volume(
             self.context, size=1024,
-            host=volutils.append_host(CONF.host, 'pool2'))
+            host=volume_utils.append_host(CONF.host, 'pool2'))
         self.volume.init_host(service_id=self.service_id)
         init_host_mock.assert_called_once_with(
             service_id=self.service_id, added_to_cluster=None)
@@ -74,7 +74,7 @@ class VolumeInitHostTestCase(base.BaseVolumeTestCase):
         # to be volume_backend_name or None
 
         vol0.refresh()
-        expected_host = volutils.append_host(CONF.host, 'fake')
+        expected_host = volume_utils.append_host(CONF.host, 'fake')
         self.assertEqual(expected_host, vol0.host)
         self.volume.delete_volume(self.context, vol0)
         self.volume.delete_volume(self.context, vol1)
@@ -100,24 +100,24 @@ class VolumeInitHostTestCase(base.BaseVolumeTestCase):
                                   cluster_name=cluster_name)
         tests_utils.create_volume(
             self.context, size=128, cluster_name=cluster_name,
-            host=volutils.append_host(CONF.host, 'pool0'))
+            host=volume_utils.append_host(CONF.host, 'pool0'))
         tests_utils.create_volume(
             self.context, size=256, cluster_name=cluster_name,
-            host=volutils.append_host(CONF.host + '2', 'pool0'))
+            host=volume_utils.append_host(CONF.host + '2', 'pool0'))
         tests_utils.create_volume(
             self.context, size=512, cluster_name=cluster_name,
-            host=volutils.append_host(CONF.host + '2', 'pool1'))
+            host=volume_utils.append_host(CONF.host + '2', 'pool1'))
         tests_utils.create_volume(
             self.context, size=1024, cluster_name=cluster_name,
-            host=volutils.append_host(CONF.host + '3', 'pool2'))
+            host=volume_utils.append_host(CONF.host + '3', 'pool2'))
 
         # These don't belong to the cluster so they will be ignored
         tests_utils.create_volume(
             self.context, size=1024,
-            host=volutils.append_host(CONF.host, 'pool2'))
+            host=volume_utils.append_host(CONF.host, 'pool2'))
         tests_utils.create_volume(
             self.context, size=1024, cluster_name=cluster_name + '1',
-            host=volutils.append_host(CONF.host + '3', 'pool2'))
+            host=volume_utils.append_host(CONF.host + '3', 'pool2'))
 
         self.volume.init_host(service_id=self.service_id)
         init_host_mock.assert_called_once_with(
diff --git a/cinder/tests/unit/volume/test_volume_migration.py b/cinder/tests/unit/volume/test_volume_migration.py
index 5815e00f797..a2f3ccdca87 100644
--- a/cinder/tests/unit/volume/test_volume_migration.py
+++ b/cinder/tests/unit/volume/test_volume_migration.py
@@ -41,7 +41,7 @@ from cinder.volume import api as volume_api
 from cinder.volume.flows.manager import create_volume as create_volume_manager
 from cinder.volume import rpcapi as volume_rpcapi
 from cinder.volume import volume_types
-from cinder.volume import volume_utils as volutils
+from cinder.volume import volume_utils
 
 
 QUOTAS = quota.QUOTAS
@@ -556,7 +556,7 @@ class VolumeMigrationTestCase(base.BaseVolumeTestCase):
                 mock.patch.object(os_brick.initiator.connector,
                                   'get_connector_properties') \
                 as mock_get_connector_properties, \
-                mock.patch.object(volutils, 'copy_volume') as mock_copy, \
+                mock.patch.object(volume_utils, 'copy_volume') as mock_copy, \
                 mock.patch.object(volume_rpcapi.VolumeAPI,
                                   'get_capabilities') \
                 as mock_get_capabilities:
diff --git a/cinder/volume/flows/api/create_volume.py b/cinder/volume/flows/api/create_volume.py
index 3a511e9696f..3b44cd287ac 100644
--- a/cinder/volume/flows/api/create_volume.py
+++ b/cinder/volume/flows/api/create_volume.py
@@ -30,7 +30,7 @@ from cinder import quota_utils
 from cinder import utils
 from cinder.volume.flows import common
 from cinder.volume import volume_types
-from cinder.volume import volume_utils as vol_utils
+from cinder.volume import volume_utils
 
 LOG = logging.getLogger(__name__)
 
@@ -223,7 +223,7 @@ class ExtractVolumeRequestTask(flow_utils.CinderTask):
         # exist, this is expected as it signals that the image_id is missing.
         image_meta = self.image_service.show(context, image_id)
 
-        vol_utils.check_image_metadata(image_meta, size)
+        volume_utils.check_image_metadata(image_meta, size)
 
         return image_meta
 
@@ -237,7 +237,7 @@ class ExtractVolumeRequestTask(flow_utils.CinderTask):
         the validated availability zone.
         """
         refresh_az = False
-        type_azs = vol_utils.extract_availability_zones_from_volume_type(
+        type_azs = volume_utils.extract_availability_zones_from_volume_type(
             volume_type)
         type_az_configured = type_azs is not None
         if type_az_configured:
@@ -339,12 +339,12 @@ class ExtractVolumeRequestTask(flow_utils.CinderTask):
             # Clone the existing key and associate a separate -- but
             # identical -- key with each volume.
             if encryption_key_id is not None:
-                encryption_key_id = vol_utils.clone_encryption_key(
+                encryption_key_id = volume_utils.clone_encryption_key(
                     context,
                     key_manager,
                     encryption_key_id)
             else:
-                encryption_key_id = vol_utils.create_encryption_key(
+                encryption_key_id = volume_utils.create_encryption_key(
                     context,
                     key_manager,
                     volume_type_id)
@@ -456,7 +456,7 @@ class ExtractVolumeRequestTask(flow_utils.CinderTask):
             specs = None
             extra_specs = None
 
-        if vol_utils.is_replicated_spec(extra_specs):
+        if volume_utils.is_replicated_spec(extra_specs):
             replication_status = fields.ReplicationStatus.ENABLED
         else:
             replication_status = fields.ReplicationStatus.DISABLED
@@ -740,13 +740,13 @@ class VolumeCastTask(flow_utils.CinderTask):
             # If cgroup_id existed, we should cast volume to the scheduler
             # to choose a proper pool whose backend is same as CG's backend.
             cgroup = objects.ConsistencyGroup.get_by_id(context, cgroup_id)
-            request_spec['resource_backend'] = vol_utils.extract_host(
+            request_spec['resource_backend'] = volume_utils.extract_host(
                 cgroup.resource_backend)
         elif group_id:
             # If group_id exists, we should cast volume to the scheduler
             # to choose a proper pool whose backend is same as group's backend.
             group = objects.Group.get_by_id(context, group_id)
-            request_spec['resource_backend'] = vol_utils.extract_host(
+            request_spec['resource_backend'] = volume_utils.extract_host(
                 group.resource_backend)
         elif snapshot_id and CONF.snapshot_same_host:
             # NOTE(Rongze Zhu): A simple solution for bug 1008866.
diff --git a/cinder/volume/manager.py b/cinder/volume/manager.py
index b759d3a8602..b965b081ce4 100644
--- a/cinder/volume/manager.py
+++ b/cinder/volume/manager.py
@@ -84,7 +84,7 @@ from cinder.volume import group_types
 from cinder.volume import rpcapi as volume_rpcapi
 from cinder.volume import volume_migration
 from cinder.volume import volume_types
-from cinder.volume import volume_utils as vol_utils
+from cinder.volume import volume_utils
 
 LOG = logging.getLogger(__name__)
 
@@ -205,7 +205,7 @@ class VolumeManager(manager.CleanableManager,
     def _get_service(self, host=None, binary=constants.VOLUME_BINARY):
         host = host or self.host
         ctxt = context.get_admin_context()
-        svc_host = vol_utils.extract_host(host, 'backend')
+        svc_host = volume_utils.extract_host(host, 'backend')
         return objects.Service.get_by_args(ctxt, svc_host, binary)
 
     def __init__(self, volume_driver=None, service_name=None,
@@ -315,7 +315,7 @@ class VolumeManager(manager.CleanableManager,
             self.image_volume_cache = None
 
     def _count_allocated_capacity(self, ctxt, volume):
-        pool = vol_utils.extract_host(volume['host'], 'pool')
+        pool = volume_utils.extract_host(volume['host'], 'pool')
         if pool is None:
             # No pool name encoded in host, so this is a legacy
             # volume created before pool is introduced, ask
@@ -329,8 +329,8 @@ class VolumeManager(manager.CleanableManager,
                 return
 
             if pool:
-                new_host = vol_utils.append_host(volume['host'],
-                                                 pool)
+                new_host = volume_utils.append_host(volume['host'],
+                                                    pool)
                 self.db.volume_update(ctxt, volume['id'],
                                       {'host': new_host})
             else:
@@ -339,7 +339,7 @@ class VolumeManager(manager.CleanableManager,
                 # volume_backend_name is None, use default pool name.
                 # This is only for counting purpose, doesn't update DB.
                 pool = (self.driver.configuration.safe_get(
-                    'volume_backend_name') or vol_utils.extract_host(
+                    'volume_backend_name') or volume_utils.extract_host(
                     volume['host'], 'pool', True))
         try:
             pool_stat = self.stats['pools'][pool]
@@ -563,7 +563,7 @@ class VolumeManager(manager.CleanableManager,
         self.driver.set_initialized()
 
         # Keep the image tmp file clean when init host.
-        backend_name = vol_utils.extract_host(self.service_topic_queue)
+        backend_name = volume_utils.extract_host(self.service_topic_queue)
         image_utils.cleanup_temporary_file(backend_name)
 
         # Migrate any ConfKeyManager keys based on fixed_key to the currently
@@ -669,9 +669,10 @@ class VolumeManager(manager.CleanableManager,
     def _set_resource_host(self, resource):
         """Set the host field on the DB to our own when we are clustered."""
         if (resource.is_clustered and
-                not vol_utils.hosts_are_equivalent(resource.host, self.host)):
-            pool = vol_utils.extract_host(resource.host, 'pool')
-            resource.host = vol_utils.append_host(self.host, pool)
+                not volume_utils.hosts_are_equivalent(resource.host,
+                                                      self.host)):
+            pool = volume_utils.extract_host(resource.host, 'pool')
+            resource.host = volume_utils.append_host(self.host, pool)
             resource.save()
 
     @objects.Volume.set_workers
@@ -785,8 +786,9 @@ class VolumeManager(manager.CleanableManager,
 
     def _check_is_our_resource(self, resource):
         if resource.host:
-            res_backend = vol_utils.extract_host(resource.service_topic_queue)
-            backend = vol_utils.extract_host(self.service_topic_queue)
+            res_backend = volume_utils.extract_host(
+                resource.service_topic_queue)
+            backend = volume_utils.extract_host(self.service_topic_queue)
             if res_backend != backend:
                 msg = (_('Invalid %(resource)s: %(resource)s %(id)s is not '
                          'local to %(backend)s.') %
@@ -1305,7 +1307,7 @@ class VolumeManager(manager.CleanableManager,
                 raise exception.InvalidVolume(
                     reason=_("being attached by different mode"))
 
-        host_name_sanitized = vol_utils.sanitize_hostname(
+        host_name_sanitized = volume_utils.sanitize_hostname(
             host_name) if host_name else None
         if instance_uuid:
             attachments = (
@@ -2162,11 +2164,11 @@ class VolumeManager(manager.CleanableManager,
 
         try:
             size_in_mb = int(src_vol['size']) * units.Ki    # vol size is in GB
-            vol_utils.copy_volume(src_attach_info['device']['path'],
-                                  dest_attach_info['device']['path'],
-                                  size_in_mb,
-                                  self.configuration.volume_dd_blocksize,
-                                  sparse=sparse_copy_volume)
+            volume_utils.copy_volume(src_attach_info['device']['path'],
+                                     dest_attach_info['device']['path'],
+                                     size_in_mb,
+                                     self.configuration.volume_dd_blocksize,
+                                     sparse=sparse_copy_volume)
         except Exception:
             with excutils.save_and_reraise_exception():
                 LOG.error("Failed to copy volume %(src)s to %(dest)s.",
@@ -2197,7 +2199,7 @@ class VolumeManager(manager.CleanableManager,
             new_vol_values['volume_type_id'] = new_type_id
             if volume_types.volume_types_encryption_changed(
                     ctxt, volume.volume_type_id, new_type_id):
-                encryption_key_id = vol_utils.create_encryption_key(
+                encryption_key_id = volume_utils.create_encryption_key(
                     ctxt, self.key_manager, new_type_id)
                 new_vol_values['encryption_key_id'] = encryption_key_id
 
@@ -2665,7 +2667,7 @@ class VolumeManager(manager.CleanableManager,
                                    volume,
                                    event_suffix,
                                    extra_usage_info=None):
-        vol_utils.notify_about_volume_usage(
+        volume_utils.notify_about_volume_usage(
             context, volume, event_suffix,
             extra_usage_info=extra_usage_info, host=self.host)
 
@@ -2674,7 +2676,7 @@ class VolumeManager(manager.CleanableManager,
                                      snapshot,
                                      event_suffix,
                                      extra_usage_info=None):
-        vol_utils.notify_about_snapshot_usage(
+        volume_utils.notify_about_snapshot_usage(
             context, snapshot, event_suffix,
             extra_usage_info=extra_usage_info, host=self.host)
 
@@ -2684,7 +2686,7 @@ class VolumeManager(manager.CleanableManager,
                                   event_suffix,
                                   volumes=None,
                                   extra_usage_info=None):
-        vol_utils.notify_about_group_usage(
+        volume_utils.notify_about_group_usage(
             context, group, event_suffix,
             extra_usage_info=extra_usage_info, host=self.host)
 
@@ -2693,7 +2695,7 @@ class VolumeManager(manager.CleanableManager,
                 context, group.id)
         if volumes:
             for volume in volumes:
-                vol_utils.notify_about_volume_usage(
+                volume_utils.notify_about_volume_usage(
                     context, volume, event_suffix,
                     extra_usage_info=extra_usage_info, host=self.host)
 
@@ -2703,7 +2705,7 @@ class VolumeManager(manager.CleanableManager,
                                            event_suffix,
                                            snapshots=None,
                                            extra_usage_info=None):
-        vol_utils.notify_about_group_snapshot_usage(
+        volume_utils.notify_about_group_snapshot_usage(
             context, group_snapshot, event_suffix,
             extra_usage_info=extra_usage_info, host=self.host)
 
@@ -2712,7 +2714,7 @@ class VolumeManager(manager.CleanableManager,
                 context, group_snapshot.id)
         if snapshots:
             for snapshot in snapshots:
-                vol_utils.notify_about_snapshot_usage(
+                volume_utils.notify_about_snapshot_usage(
                     context, snapshot, event_suffix,
                     extra_usage_info=extra_usage_info, host=self.host)
 
@@ -2770,11 +2772,11 @@ class VolumeManager(manager.CleanableManager,
                               for attachment in attachments]
             nova_api.extend_volume(context, instance_uuids, volume.id)
 
-        pool = vol_utils.extract_host(volume.host, 'pool')
+        pool = volume_utils.extract_host(volume.host, 'pool')
         if pool is None:
             # Legacy volume, put them into default pool
             pool = self.driver.configuration.safe_get(
-                'volume_backend_name') or vol_utils.extract_host(
+                'volume_backend_name') or volume_utils.extract_host(
                     volume.host, 'pool', True)
 
         try:
@@ -2791,10 +2793,10 @@ class VolumeManager(manager.CleanableManager,
 
     def _is_our_backend(self, host, cluster_name):
         return ((not cluster_name and
-                 vol_utils.hosts_are_equivalent(self.driver.host, host)) or
+                 volume_utils.hosts_are_equivalent(self.driver.host, host)) or
                 (cluster_name and
-                 vol_utils.hosts_are_equivalent(self.driver.cluster_name,
-                                                cluster_name)))
+                 volume_utils.hosts_are_equivalent(self.driver.cluster_name,
+                                                   cluster_name)))
 
     def retype(self, context, volume, new_type_id, host,
                migration_policy='never', reservations=None,
@@ -2954,7 +2956,7 @@ class VolumeManager(manager.CleanableManager,
         replication_diff = diff_specs.get('replication_enabled')
 
         if replication_diff:
-            is_replicated = vol_utils.is_boolean_str(replication_diff[1])
+            is_replicated = volume_utils.is_boolean_str(replication_diff[1])
             if is_replicated:
                 replication_status = fields.ReplicationStatus.ENABLED
             else:
@@ -2973,11 +2975,11 @@ class VolumeManager(manager.CleanableManager,
 
     def _update_stats_for_managed(self, volume_reference):
         # Update volume stats
-        pool = vol_utils.extract_host(volume_reference.host, 'pool')
+        pool = volume_utils.extract_host(volume_reference.host, 'pool')
         if pool is None:
             # Legacy volume, put them into default pool
             pool = self.driver.configuration.safe_get(
-                'volume_backend_name') or vol_utils.extract_host(
+                'volume_backend_name') or volume_utils.extract_host(
                     volume_reference.host, 'pool', True)
 
         try:
@@ -3440,12 +3442,13 @@ class VolumeManager(manager.CleanableManager,
     def _update_allocated_capacity(self, vol, decrement=False, host=None):
         # Update allocated capacity in volume stats
         host = host or vol['host']
-        pool = vol_utils.extract_host(host, 'pool')
+        pool = volume_utils.extract_host(host, 'pool')
         if pool is None:
             # Legacy volume, put them into default pool
             pool = self.driver.configuration.safe_get(
-                'volume_backend_name') or vol_utils.extract_host(host, 'pool',
-                                                                 True)
+                'volume_backend_name') or volume_utils.extract_host(host,
+                                                                    'pool',
+                                                                    True)
 
         vol_size = -vol['size'] if decrement else vol['size']
         try: