diff --git a/cinder/tests/unit/volume/drivers/dell_emc/powermax/test_powermax_common.py b/cinder/tests/unit/volume/drivers/dell_emc/powermax/test_powermax_common.py
index b7e1cc6875b..214813666cc 100644
--- a/cinder/tests/unit/volume/drivers/dell_emc/powermax/test_powermax_common.py
+++ b/cinder/tests/unit/volume/drivers/dell_emc/powermax/test_powermax_common.py
@@ -2301,12 +2301,18 @@ class PowerMaxCommonTest(test.TestCase):
                           self.common.manage_existing_snapshot,
                           snapshot, existing_ref)
 
-    @mock.patch.object(common.PowerMaxCommon, '_sync_check')
     @mock.patch.object(rest.PowerMaxRest, 'modify_volume_snap')
-    def test_unmanage_snapshot_success(self, mock_mod, mock_sync):
+    def test_unmanage_snapshot_success(self, mock_mod, ):
         self.common.unmanage_snapshot(self.data.test_snapshot_manage)
         mock_mod.assert_called_once()
 
+    @mock.patch.object(common.PowerMaxCommon, '_sync_check')
+    @mock.patch.object(rest.PowerMaxRest, 'modify_volume_snap')
+    def test_unmanage_snapshot_no_sync_check(self, mock_mod, mock_sync):
+        self.common.unmanage_snapshot(self.data.test_snapshot_manage)
+        mock_mod.assert_called_once()
+        mock_sync.assert_not_called()
+
     @mock.patch.object(utils.PowerMaxUtils, 'is_volume_failed_over',
                        return_value=True)
     def test_unmanage_snapshot_fail_failover(self, mock_failed):
diff --git a/cinder/volume/drivers/dell_emc/powermax/common.py b/cinder/volume/drivers/dell_emc/powermax/common.py
index 38d6a8110ed..1acb3d469cb 100644
--- a/cinder/volume/drivers/dell_emc/powermax/common.py
+++ b/cinder/volume/drivers/dell_emc/powermax/common.py
@@ -2602,12 +2602,15 @@ class PowerMaxCommon(object):
             raise exception.VolumeBackendAPIException(
                 message=exception_message)
 
-        self._sync_check(array, device_id, extra_specs)
-
         LOG.info("Snapshot %(snap_name)s is no longer managed in "
                  "OpenStack but still remains on PowerMax/VMAX source "
                  "%(array_id)s", {'snap_name': snap_name, 'array_id': array})
 
+        LOG.warning("In order to remove the snapshot source volume from "
+                    "OpenStack you will need to either delete the linked "
+                    "SnapVX snapshot on the array or un-manage the volume "
+                    "from Cinder.")
+
     def get_manageable_volumes(self, marker, limit, offset, sort_keys,
                                sort_dirs):
         """Lists all manageable volumes.