diff --git a/cinder/volume/drivers/emc/emc_smis_common.py b/cinder/volume/drivers/emc/emc_smis_common.py
index 7e22befdd55..c06dc131264 100644
--- a/cinder/volume/drivers/emc/emc_smis_common.py
+++ b/cinder/volume/drivers/emc/emc_smis_common.py
@@ -30,6 +30,7 @@ from xml.dom.minidom import parseString
 
 from cinder import exception
 from cinder.openstack.common import log as logging
+from cinder import units
 
 LOG = logging.getLogger(__name__)
 
@@ -75,7 +76,7 @@ class EMCSMISCommon():
         """Creates a EMC(VMAX/VNX) volume."""
 
         LOG.debug(_('Entering create_volume.'))
-        volumesize = int(volume['size']) * 1073741824
+        volumesize = int(volume['size']) * units.GiB
         volumename = volume['name']
 
         LOG.info(_('Create Volume: %(volume)s  Size: %(size)lu')
diff --git a/cinder/volume/drivers/glusterfs.py b/cinder/volume/drivers/glusterfs.py
index 96f12bf5919..4ee4db4b1eb 100644
--- a/cinder/volume/drivers/glusterfs.py
+++ b/cinder/volume/drivers/glusterfs.py
@@ -30,6 +30,7 @@ from cinder import db
 from cinder import exception
 from cinder.image import image_utils
 from cinder.openstack.common import log as logging
+from cinder import units
 from cinder.volume.drivers import nfs
 
 LOG = logging.getLogger(__name__)
@@ -991,7 +992,7 @@ class GlusterfsDriver(nfs.RemoteFsDriver):
                 greatest_share = glusterfs_share
                 greatest_size = capacity
 
-        if volume_size_for * 1024 * 1024 * 1024 > greatest_size:
+        if volume_size_for * units.GiB > greatest_size:
             raise exception.GlusterfsNoSuitableShareFound(
                 volume_size=volume_size_for)
         return greatest_share
diff --git a/cinder/volume/drivers/rbd.py b/cinder/volume/drivers/rbd.py
index 994788eb86f..192fd47ca93 100644
--- a/cinder/volume/drivers/rbd.py
+++ b/cinder/volume/drivers/rbd.py
@@ -457,9 +457,9 @@ class RBDDriver(driver.VolumeDriver):
     def create_volume(self, volume):
         """Creates a logical volume."""
         if int(volume['size']) == 0:
-            size = 100 * 1024 ** 2
+            size = 100 * units.MiB
         else:
-            size = int(volume['size']) * 1024 ** 3
+            size = int(volume['size']) * units.GiB
 
         LOG.debug(_("creating volume '%s'") % (volume['name']))
 
diff --git a/cinder/volume/drivers/scality.py b/cinder/volume/drivers/scality.py
index 10ee48192ab..0d2d0d37c77 100644
--- a/cinder/volume/drivers/scality.py
+++ b/cinder/volume/drivers/scality.py
@@ -27,6 +27,7 @@ from oslo.config import cfg
 from cinder import exception
 from cinder.image import image_utils
 from cinder.openstack.common import log as logging
+from cinder import units
 from cinder.volume import driver
 
 
@@ -107,8 +108,8 @@ class ScalityDriver(driver.VolumeDriver):
 
     def _size_bytes(self, size_in_g):
         if int(size_in_g) == 0:
-            return 100 * 1024 * 1024
-        return int(size_in_g) * 1024 * 1024 * 1024
+            return 100 * units.MiB
+        return int(size_in_g) * units.GiB
 
     def _create_file(self, path, size):
         with open(path, "ab") as f:
diff --git a/cinder/volume/drivers/xenapi/lib.py b/cinder/volume/drivers/xenapi/lib.py
index 4c48fc2dbbb..a7969281edb 100644
--- a/cinder/volume/drivers/xenapi/lib.py
+++ b/cinder/volume/drivers/xenapi/lib.py
@@ -16,11 +16,13 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from cinder.volume.drivers.xenapi import tools
 import contextlib
 import os
 import pickle
 
+from cinder import units
+from cinder.volume.drivers.xenapi import tools
+
 
 class XenAPIException(Exception):
     def __init__(self, original_exception):
@@ -258,7 +260,7 @@ class CompoundOperations(object):
 
 
 def to_bytes(size_in_gigs):
-    return size_in_gigs * 1024 * 1024 * 1024
+    return size_in_gigs * units.GiB
 
 
 class NFSOperationsMixIn(CompoundOperations):