diff --git a/cinder/tests/unit/test_dellscapi.py b/cinder/tests/unit/test_dellscapi.py
index 3c9ac3bb960..d24bdcf7c9a 100644
--- a/cinder/tests/unit/test_dellscapi.py
+++ b/cinder/tests/unit/test_dellscapi.py
@@ -6100,7 +6100,6 @@ class DellSCSanAPITestCase(test.TestCase):
                    'StorageCenter': ssn,
                    'ReplicateActiveReplay': False,
                    'Type': 'Asynchronous',
-                   'SyncMode': 'HighAvailability',
                    'DestinationVolumeAttributes':
                        {'CreateSourceVolumeFolderPath': True,
                         'Notes': notes,
@@ -6116,6 +6115,7 @@ class DellSCSanAPITestCase(test.TestCase):
         self.assertDictEqual(self.SCREPL[0], ret)
         payload['Type'] = 'Synchronous'
         payload['ReplicateActiveReplay'] = True
+        payload['SyncMode'] = 'HighAvailability'
         ret = self.scapi.create_replication(self.VOLUME,
                                             str(destssn),
                                             qosnode,
@@ -6166,7 +6166,6 @@ class DellSCSanAPITestCase(test.TestCase):
                    'StorageCenter': ssn,
                    'ReplicateActiveReplay': False,
                    'Type': 'Asynchronous',
-                   'SyncMode': 'HighAvailability',
                    'DestinationVolumeAttributes':
                        {'CreateSourceVolumeFolderPath': True,
                         'Notes': notes,
@@ -6183,6 +6182,7 @@ class DellSCSanAPITestCase(test.TestCase):
 
         payload['Type'] = 'Synchronous'
         payload['ReplicateActiveReplay'] = True
+        payload['SyncMode'] = 'HighAvailability'
         ret = self.scapi.create_replication(self.VOLUME,
                                             str(destssn),
                                             qosnode,
diff --git a/cinder/volume/drivers/dell/dell_storagecenter_api.py b/cinder/volume/drivers/dell/dell_storagecenter_api.py
index 5297cf19abe..8ba7d85990d 100644
--- a/cinder/volume/drivers/dell/dell_storagecenter_api.py
+++ b/cinder/volume/drivers/dell/dell_storagecenter_api.py
@@ -2702,8 +2702,12 @@ class StorageCenterApi(object):
         payload['StorageCenter'] = self.find_sc()
         # Have to replicate the active replay.
         payload['ReplicateActiveReplay'] = replicate_active or synchronous
-        payload['Type'] = 'Synchronous' if synchronous else 'Asynchronous'
-        payload['SyncMode'] = 'HighAvailability'
+        if synchronous:
+            payload['Type'] = 'Synchronous'
+            # If our type is synchronous we prefer high availability be set.
+            payload['SyncMode'] = 'HighAvailability'
+        else:
+            payload['Type'] = 'Asynchronous'
         destinationvolumeattributes = {}
         destinationvolumeattributes['CreateSourceVolumeFolderPath'] = True
         destinationvolumeattributes['Notes'] = self.notes