diff --git a/cinder/api/api_utils.py b/cinder/api/api_utils.py
index 1d700502b76..d60bfd40033 100644
--- a/cinder/api/api_utils.py
+++ b/cinder/api/api_utils.py
@@ -130,3 +130,16 @@ def validate_integer(value, name, min_value=None, max_value=None):
         return value
     except ValueError as e:
         raise webob.exc.HTTPBadRequest(explanation=six.text_type(e))
+
+
+def walk_class_hierarchy(clazz, encountered=None):
+    """Walk class hierarchy, yielding most derived classes first."""
+    if not encountered:
+        encountered = []
+    for subclass in clazz.__subclasses__():
+        if subclass not in encountered:
+            encountered.append(subclass)
+            # drill down to leaves first
+            for subsubclass in walk_class_hierarchy(subclass, encountered):
+                yield subsubclass
+            yield subclass
diff --git a/cinder/api/middleware/fault.py b/cinder/api/middleware/fault.py
index 862fe25e481..463e8579263 100644
--- a/cinder/api/middleware/fault.py
+++ b/cinder/api/middleware/fault.py
@@ -20,10 +20,10 @@ from six.moves import http_client
 import webob.dec
 import webob.exc
 
+from cinder.api import api_utils
 from cinder.api.openstack import wsgi
 from cinder import exception
 from cinder.i18n import _
-from cinder import utils
 from cinder.wsgi import common as base_wsgi
 
 
@@ -38,7 +38,7 @@ class FaultWrapper(base_wsgi.Middleware):
     @staticmethod
     def status_to_type(status):
         if not FaultWrapper._status_to_type:
-            for clazz in utils.walk_class_hierarchy(webob.exc.HTTPError):
+            for clazz in api_utils.walk_class_hierarchy(webob.exc.HTTPError):
                 FaultWrapper._status_to_type[clazz.code] = clazz
         return FaultWrapper._status_to_type.get(
             status, webob.exc.HTTPInternalServerError)()
diff --git a/cinder/tests/unit/test_qos_specs.py b/cinder/tests/unit/test_qos_specs.py
index 2722756793e..38f38d9f7f3 100644
--- a/cinder/tests/unit/test_qos_specs.py
+++ b/cinder/tests/unit/test_qos_specs.py
@@ -29,7 +29,7 @@ from cinder import db
 from cinder import exception
 from cinder import test
 from cinder.tests.unit import fake_constants as fake
-from cinder import utils
+from cinder.tests.unit import utils as test_utils
 from cinder.volume import qos_specs
 from cinder.volume import volume_types
 
@@ -374,7 +374,7 @@ class QoSSpecsTestCase(test.TestCase):
                 qos_specs_dict['specs'])
             qos_specs_dict['id'] = qos_specs_id
             specs = db.qos_specs_get(self.ctxt, qos_specs_id)
-            qos_specs_list[index]['created_at'] = utils.time_format(
+            qos_specs_list[index]['created_at'] = test_utils.time_format(
                 specs['created_at'])
 
         res = qos_specs.get_all_specs(self.ctxt)
diff --git a/cinder/tests/unit/test_utils.py b/cinder/tests/unit/test_utils.py
index 3d83cb07200..57b6e3c477f 100644
--- a/cinder/tests/unit/test_utils.py
+++ b/cinder/tests/unit/test_utils.py
@@ -33,6 +33,7 @@ from cinder import exception
 from cinder import test
 from cinder.tests.unit import fake_constants as fake
 from cinder import utils
+from cinder.volume import utils as volume_utils
 
 POOL_CAPS = {'total_capacity_gb': 0,
              'free_capacity_gb': 0,
@@ -124,26 +125,26 @@ class GenericUtilsTestCase(test.TestCase):
     def test_hostname_unicode_sanitization(self):
         hostname = u"\u7684.test.example.com"
         self.assertEqual("test.example.com",
-                         utils.sanitize_hostname(hostname))
+                         volume_utils.sanitize_hostname(hostname))
 
     def test_hostname_sanitize_periods(self):
         hostname = "....test.example.com..."
         self.assertEqual("test.example.com",
-                         utils.sanitize_hostname(hostname))
+                         volume_utils.sanitize_hostname(hostname))
 
     def test_hostname_sanitize_dashes(self):
         hostname = "----test.example.com---"
         self.assertEqual("test.example.com",
-                         utils.sanitize_hostname(hostname))
+                         volume_utils.sanitize_hostname(hostname))
 
     def test_hostname_sanitize_characters(self):
         hostname = "(#@&$!(@*--#&91)(__=+--test-host.example!!.com-0+"
         self.assertEqual("91----test-host.example.com-0",
-                         utils.sanitize_hostname(hostname))
+                         volume_utils.sanitize_hostname(hostname))
 
     def test_hostname_translate(self):
         hostname = "<}\x1fh\x10e\x08l\x02l\x05o\x12!{>"
-        self.assertEqual("hello", utils.sanitize_hostname(hostname))
+        self.assertEqual("hello", volume_utils.sanitize_hostname(hostname))
 
     @mock.patch('os.path.join', side_effect=lambda x, y: '/'.join((x, y)))
     def test_make_dev_path(self, mock_join):
@@ -385,11 +386,11 @@ class WalkClassHierarchyTestCase(test.TestCase):
             pass
 
         class_pairs = zip((D, B, E),
-                          utils.walk_class_hierarchy(A, encountered=[C]))
+                          api_utils.walk_class_hierarchy(A, encountered=[C]))
         for actual, expected in class_pairs:
             self.assertEqual(expected, actual)
 
-        class_pairs = zip((D, B, C, E), utils.walk_class_hierarchy(A))
+        class_pairs = zip((D, B, C, E), api_utils.walk_class_hierarchy(A))
         for actual, expected in class_pairs:
             self.assertEqual(expected, actual)
 
diff --git a/cinder/tests/unit/utils.py b/cinder/tests/unit/utils.py
index 4b849e77c29..6949e968ea2 100644
--- a/cinder/tests/unit/utils.py
+++ b/cinder/tests/unit/utils.py
@@ -556,3 +556,19 @@ def set_timeout(timeout):
         return _wrapper
 
     return _decorator
+
+
+def time_format(at=None):
+    """Format datetime string to date.
+
+    :param at: Type is datetime.datetime (example
+        'datetime.datetime(2017, 12, 24, 22, 11, 32, 6086)')
+    :returns: Format date (example '2017-12-24T22:11:32Z').
+    """
+    if not at:
+        at = timeutils.utcnow()
+    date_string = at.strftime("%Y-%m-%dT%H:%M:%S")
+    tz = at.tzname(None) if at.tzinfo else 'UTC'
+    # Need to handle either iso8601 or python UTC format
+    date_string += ('Z' if tz in ['UTC', 'UTC+00:00'] else tz)
+    return date_string
diff --git a/cinder/tests/unit/volume/drivers/netapp/dataontap/client/test_client_cmode.py b/cinder/tests/unit/volume/drivers/netapp/dataontap/client/test_client_cmode.py
index fe0a5e89f2e..12fb2c8ea22 100644
--- a/cinder/tests/unit/volume/drivers/netapp/dataontap/client/test_client_cmode.py
+++ b/cinder/tests/unit/volume/drivers/netapp/dataontap/client/test_client_cmode.py
@@ -1055,7 +1055,7 @@ class NetAppCmodeClientTestCase(test.TestCase):
             mock.call('qos-policy-group-delete-iter', api_args, False)])
         self.assertEqual(1, mock_log.call_count)
 
-    @mock.patch('cinder.utils.resolve_hostname',
+    @mock.patch('cinder.volume.utils.resolve_hostname',
                 return_value='192.168.1.101')
     def test_get_if_info_by_ip_not_found(self, mock_resolve_hostname):
         fake_ip = '192.168.1.101'
@@ -1070,7 +1070,7 @@ class NetAppCmodeClientTestCase(test.TestCase):
         self.assertRaises(exception.NotFound, self.client.get_if_info_by_ip,
                           fake_ip)
 
-    @mock.patch('cinder.utils.resolve_hostname',
+    @mock.patch('cinder.volume.utils.resolve_hostname',
                 return_value='192.168.1.101')
     def test_get_if_info_by_ip(self, mock_resolve_hostname):
         fake_ip = '192.168.1.101'
diff --git a/cinder/tests/unit/volume/drivers/netapp/dataontap/test_nfs_base.py b/cinder/tests/unit/volume/drivers/netapp/dataontap/test_nfs_base.py
index 4f0bdf4d897..cc5b4ff1640 100644
--- a/cinder/tests/unit/volume/drivers/netapp/dataontap/test_nfs_base.py
+++ b/cinder/tests/unit/volume/drivers/netapp/dataontap/test_nfs_base.py
@@ -41,6 +41,7 @@ from cinder.volume.drivers.netapp.dataontap.utils import loopingcalls
 from cinder.volume.drivers.netapp import utils as na_utils
 from cinder.volume.drivers import nfs
 from cinder.volume.drivers import remotefs
+from cinder.volume import utils as volume_utils
 
 
 @ddt.ddt
@@ -651,7 +652,7 @@ class NetAppNfsDriverTestCase(test.TestCase):
                           fake.NFS_SHARE)
 
     def test_get_share_mount_and_vol_from_vol_ref(self):
-        self.mock_object(utils, 'resolve_hostname',
+        self.mock_object(volume_utils, 'resolve_hostname',
                          return_value='10.12.142.11')
         self.mock_object(os.path, 'isfile', return_value=True)
         self.driver._mounted_shares = [self.fake_nfs_export_1]
@@ -669,7 +670,7 @@ class NetAppNfsDriverTestCase(test.TestCase):
         self.assertEqual('test_file_name', file_path)
 
     def test_get_share_mount_and_vol_from_vol_ref_with_bad_ref(self):
-        self.mock_object(utils, 'resolve_hostname',
+        self.mock_object(volume_utils, 'resolve_hostname',
                          return_value='10.12.142.11')
         self.driver._mounted_shares = [self.fake_nfs_export_1]
         vol_ref = {'source-id': '1234546'}
@@ -683,7 +684,7 @@ class NetAppNfsDriverTestCase(test.TestCase):
                           vol_ref)
 
     def test_get_share_mount_and_vol_from_vol_ref_where_not_found(self):
-        self.mock_object(utils, 'resolve_hostname',
+        self.mock_object(volume_utils, 'resolve_hostname',
                          return_value='10.12.142.11')
         self.driver._mounted_shares = [self.fake_nfs_export_1]
         vol_path = "%s/%s" % (self.fake_nfs_export_2, 'test_file_name')
@@ -698,7 +699,7 @@ class NetAppNfsDriverTestCase(test.TestCase):
                           vol_ref)
 
     def test_get_share_mount_and_vol_from_vol_ref_where_is_dir(self):
-        self.mock_object(utils, 'resolve_hostname',
+        self.mock_object(volume_utils, 'resolve_hostname',
                          return_value='10.12.142.11')
         self.driver._mounted_shares = [self.fake_nfs_export_1]
         vol_ref = {'source-name': self.fake_nfs_export_2}
diff --git a/cinder/tests/unit/volume/drivers/netapp/dataontap/test_nfs_cmode.py b/cinder/tests/unit/volume/drivers/netapp/dataontap/test_nfs_cmode.py
index b3b6f3defcd..133bf968462 100644
--- a/cinder/tests/unit/volume/drivers/netapp/dataontap/test_nfs_cmode.py
+++ b/cinder/tests/unit/volume/drivers/netapp/dataontap/test_nfs_cmode.py
@@ -307,7 +307,7 @@ class NetAppCmodeNfsDriverTestCase(test.TestCase):
             self.driver.zapi_client, 'get_operational_lif_addresses',
             return_value=[fake.SHARE_IP])
         mock_resolve_hostname = self.mock_object(
-            utils, 'resolve_hostname', return_value=fake.SHARE_IP)
+            volume_utils, 'resolve_hostname', return_value=fake.SHARE_IP)
         mock_get_flexvol = self.mock_object(
             self.driver.zapi_client, 'get_flexvol',
             return_value={'name': fake.NETAPP_VOLUME})
@@ -330,7 +330,7 @@ class NetAppCmodeNfsDriverTestCase(test.TestCase):
         self.mock_object(self.driver.zapi_client,
                          'get_operational_lif_addresses',
                          return_value=[])
-        self.mock_object(utils,
+        self.mock_object(volume_utils,
                          'resolve_hostname',
                          return_value=fake.SHARE_IP)
 
@@ -344,7 +344,7 @@ class NetAppCmodeNfsDriverTestCase(test.TestCase):
         self.mock_object(self.driver.zapi_client,
                          'get_operational_lif_addresses',
                          return_value=[fake.SHARE_IP])
-        self.mock_object(utils,
+        self.mock_object(volume_utils,
                          'resolve_hostname',
                          return_value=fake.SHARE_IP)
         side_effect = exception.VolumeBackendAPIException(data='fake_data')
diff --git a/cinder/utils.py b/cinder/utils.py
index b7cb9ae9095..b601083eade 100644
--- a/cinder/utils.py
+++ b/cinder/utils.py
@@ -32,7 +32,6 @@ import pyclbr
 import random
 import re
 import shutil
-import socket
 import stat
 import sys
 import tempfile
@@ -275,22 +274,6 @@ def last_completed_audit_period(unit=None):
     return (begin, end)
 
 
-def time_format(at=None):
-    """Format datetime string to date.
-
-    :param at: Type is datetime.datetime (example
-        'datetime.datetime(2017, 12, 24, 22, 11, 32, 6086)')
-    :returns: Format date (example '2017-12-24T22:11:32Z').
-    """
-    if not at:
-        at = timeutils.utcnow()
-    date_string = at.strftime("%Y-%m-%dT%H:%M:%S")
-    tz = at.tzname(None) if at.tzinfo else 'UTC'
-    # Need to handle either iso8601 or python UTC format
-    date_string += ('Z' if tz in ['UTC', 'UTC+00:00'] else tz)
-    return date_string
-
-
 def monkey_patch():
     """Patches decorators for all functions in a specified module.
 
@@ -353,23 +336,6 @@ def make_dev_path(dev, partition=None, base='/dev'):
     return path
 
 
-def sanitize_hostname(hostname):
-    """Return a hostname which conforms to RFC-952 and RFC-1123 specs."""
-    if six.PY3:
-        hostname = hostname.encode('latin-1', 'ignore')
-        hostname = hostname.decode('latin-1')
-    else:
-        if isinstance(hostname, six.text_type):
-            hostname = hostname.encode('latin-1', 'ignore')
-
-    hostname = re.sub(r'[ _]', '-', hostname)
-    hostname = re.sub(r'[^\w.-]+', '', hostname)
-    hostname = hostname.lower()
-    hostname = hostname.strip('.-')
-
-    return hostname
-
-
 def robust_file_write(directory, filename, data):
     """Robust file write.
 
@@ -453,19 +419,6 @@ def tempdir(**kwargs):
                       six.text_type(e))
 
 
-def walk_class_hierarchy(clazz, encountered=None):
-    """Walk class hierarchy, yielding most derived classes first."""
-    if not encountered:
-        encountered = []
-    for subclass in clazz.__subclasses__():
-        if subclass not in encountered:
-            encountered.append(subclass)
-            # drill down to leaves first
-            for subsubclass in walk_class_hierarchy(subclass, encountered):
-                yield subsubclass
-            yield subclass
-
-
 def get_root_helper():
     return 'sudo cinder-rootwrap %s' % CONF.rootwrap_config
 
@@ -922,22 +875,6 @@ def setup_tracing(trace_flags):
     TRACE_API = 'api' in trace_flags
 
 
-def resolve_hostname(hostname):
-    """Resolves host name to IP address.
-
-    Resolves a host name (my.data.point.com) to an IP address (10.12.143.11).
-    This routine also works if the data passed in hostname is already an IP.
-    In this case, the same IP address will be returned.
-
-    :param hostname:  Host name to resolve.
-    :returns:         IP Address for Host name.
-    """
-    ip = socket.getaddrinfo(hostname, None)[0][4][0]
-    LOG.debug('Asked to resolve hostname %(host)s and got IP %(ip)s.',
-              {'host': hostname, 'ip': ip})
-    return ip
-
-
 def build_or_str(elements, str_format=None):
     """Builds a string of elements joined by 'or'.
 
diff --git a/cinder/volume/drivers/netapp/dataontap/client/client_cmode.py b/cinder/volume/drivers/netapp/dataontap/client/client_cmode.py
index e7de3ee22d0..b676aadd8eb 100644
--- a/cinder/volume/drivers/netapp/dataontap/client/client_cmode.py
+++ b/cinder/volume/drivers/netapp/dataontap/client/client_cmode.py
@@ -30,6 +30,7 @@ from cinder import utils
 from cinder.volume.drivers.netapp.dataontap.client import api as netapp_api
 from cinder.volume.drivers.netapp.dataontap.client import client_base
 from cinder.volume.drivers.netapp import utils as na_utils
+from cinder.volume import utils as volume_utils
 
 from oslo_utils import strutils
 
@@ -668,7 +669,7 @@ class Client(client_base.Client):
         net_if_iter.add_child_elem(query)
         query.add_node_with_children(
             'net-interface-info',
-            **{'address': utils.resolve_hostname(ip)})
+            **{'address': volume_utils.resolve_hostname(ip)})
         result = self.connection.invoke_successfully(net_if_iter, True)
         num_records = result.get_child_content('num-records')
         if num_records and int(num_records) >= 1:
diff --git a/cinder/volume/drivers/netapp/dataontap/nfs_base.py b/cinder/volume/drivers/netapp/dataontap/nfs_base.py
index df768d1b95f..4016c2b7f7c 100644
--- a/cinder/volume/drivers/netapp/dataontap/nfs_base.py
+++ b/cinder/volume/drivers/netapp/dataontap/nfs_base.py
@@ -906,7 +906,7 @@ class NetAppNfsDriver(driver.ManageableVD,
         # First strip out share and convert to IP format.
         share_split = vol_ref.rsplit(':', 1)
 
-        vol_ref_share_ip = utils.resolve_hostname(share_split[0])
+        vol_ref_share_ip = volume_utils.resolve_hostname(share_split[0])
 
         # Now place back into volume reference.
         vol_ref_share = vol_ref_share_ip + ':' + share_split[1]
diff --git a/cinder/volume/drivers/netapp/dataontap/nfs_cmode.py b/cinder/volume/drivers/netapp/dataontap/nfs_cmode.py
index fbb50e06cc1..d135cb8f28a 100644
--- a/cinder/volume/drivers/netapp/dataontap/nfs_cmode.py
+++ b/cinder/volume/drivers/netapp/dataontap/nfs_cmode.py
@@ -327,7 +327,7 @@ class NetAppCmodeNfsDriver(nfs_base.NetAppNfsDriver,
         for share in self._mounted_shares:
             host, junction_path = na_utils.get_export_host_junction_path(share)
 
-            address = utils.resolve_hostname(host)
+            address = volume_utils.resolve_hostname(host)
 
             if address not in vserver_addresses:
                 LOG.warning('Address not found for NFS share %s.', share)
@@ -463,7 +463,7 @@ class NetAppCmodeNfsDriver(nfs_base.NetAppNfsDriver,
 
     def _get_ip_verify_on_cluster(self, host):
         """Verifies if host on same cluster and returns ip."""
-        ip = utils.resolve_hostname(host)
+        ip = volume_utils.resolve_hostname(host)
         vserver = self._get_vserver_for_ip(ip)
         if not vserver:
             raise exception.NotFound(_("Unable to locate an SVM that is "
diff --git a/cinder/volume/drivers/zfssa/zfssaiscsi.py b/cinder/volume/drivers/zfssa/zfssaiscsi.py
index a46d465adc9..5a8d540ef39 100644
--- a/cinder/volume/drivers/zfssa/zfssaiscsi.py
+++ b/cinder/volume/drivers/zfssa/zfssaiscsi.py
@@ -263,7 +263,7 @@ class ZFSSAISCSIDriver(driver.ISCSIDriver):
 
         # Lookup the zfssa_target_portal DNS name to an IP address
         host, port = lcfg.zfssa_target_portal.split(':')
-        host_ip_addr = utils.resolve_hostname(host)
+        host_ip_addr = volume_utils.resolve_hostname(host)
         self.zfssa_target_portal = host_ip_addr + ':' + port
 
     def check_for_setup_error(self):
diff --git a/cinder/volume/manager.py b/cinder/volume/manager.py
index fc7fee7ab57..7c4b91deaa6 100644
--- a/cinder/volume/manager.py
+++ b/cinder/volume/manager.py
@@ -1305,7 +1305,7 @@ class VolumeManager(manager.CleanableManager,
                 raise exception.InvalidVolume(
                     reason=_("being attached by different mode"))
 
-        host_name_sanitized = utils.sanitize_hostname(
+        host_name_sanitized = vol_utils.sanitize_hostname(
             host_name) if host_name else None
         if instance_uuid:
             attachments = (
diff --git a/cinder/volume/utils.py b/cinder/volume/utils.py
index 19df5de56bc..4f1bfb66575 100644
--- a/cinder/volume/utils.py
+++ b/cinder/volume/utils.py
@@ -23,6 +23,7 @@ import operator
 import os
 from os import urandom
 import re
+import socket
 import tempfile
 import time
 import uuid
@@ -1213,3 +1214,36 @@ def sanitize_host(host):
     if netutils.is_valid_ipv6(host):
         return '[%s]' % host
     return host
+
+
+def sanitize_hostname(hostname):
+    """Return a hostname which conforms to RFC-952 and RFC-1123 specs."""
+    if six.PY3:
+        hostname = hostname.encode('latin-1', 'ignore')
+        hostname = hostname.decode('latin-1')
+    else:
+        if isinstance(hostname, six.text_type):
+            hostname = hostname.encode('latin-1', 'ignore')
+
+    hostname = re.sub(r'[ _]', '-', hostname)
+    hostname = re.sub(r'[^\w.-]+', '', hostname)
+    hostname = hostname.lower()
+    hostname = hostname.strip('.-')
+
+    return hostname
+
+
+def resolve_hostname(hostname):
+    """Resolves host name to IP address.
+
+    Resolves a host name (my.data.point.com) to an IP address (10.12.143.11).
+    This routine also works if the data passed in hostname is already an IP.
+    In this case, the same IP address will be returned.
+
+    :param hostname:  Host name to resolve.
+    :returns:         IP Address for Host name.
+    """
+    ip = socket.getaddrinfo(hostname, None)[0][4][0]
+    LOG.debug('Asked to resolve hostname %(host)s and got IP %(ip)s.',
+              {'host': hostname, 'ip': ip})
+    return ip