diff --git a/cinder/tests/unit/test_hpe3par.py b/cinder/tests/unit/test_hpe3par.py
index 7a8d5af50..7ccef10d9 100644
--- a/cinder/tests/unit/test_hpe3par.py
+++ b/cinder/tests/unit/test_hpe3par.py
@@ -2690,6 +2690,30 @@ class HPE3PARBaseDriver(object):
 
             mock_client.assert_has_calls(expected)
 
+    def test_terminate_connection_from_primary_when_failed_over(self):
+        # setup_mock_client drive with default configuration
+        # and return the mock HTTP 3PAR client
+        mock_client = self.setup_driver()
+        mock_client.getHostVLUNs.side_effect = hpeexceptions.HTTPNotFound(
+            error={'desc': 'The host does not exist.'})
+
+        with mock.patch.object(hpecommon.HPE3PARCommon,
+                               '_create_client') as mock_create_client:
+            mock_create_client.return_value = mock_client
+
+            self.driver._active_backend_id = 'some_id'
+            self.driver.terminate_connection(
+                self.volume,
+                self.connector,
+                force=True)
+
+            # When the volume is still attached to the primary array after a
+            # fail-over, there should be no call to delete the VLUN(s) or the
+            # host. We can assert these methods were not called to make sure
+            # the proper exceptions are being raised.
+            self.assertEqual(0, mock_client.deleteVLUN.call_count)
+            self.assertEqual(0, mock_client.deleteHost.call_count)
+
     def test_extend_volume(self):
         # setup_mock_client drive with default configuration
         # and return the mock HTTP 3PAR client
diff --git a/cinder/volume/drivers/hpe/hpe_3par_common.py b/cinder/volume/drivers/hpe/hpe_3par_common.py
index d15455109..efdd04936 100644
--- a/cinder/volume/drivers/hpe/hpe_3par_common.py
+++ b/cinder/volume/drivers/hpe/hpe_3par_common.py
@@ -237,10 +237,11 @@ class HPE3PARCommon(object):
         3.0.18.3 - Fix delete volume when online clone is active. bug #1349639.
                    (backported from Newton)
         3.0.18.4 - Fix concurrent snapshot delete conflict. bug #1600104
+        3.0.19 - Fix terminate connection on failover
 
     """
 
-    VERSION = "3.0.18.4"
+    VERSION = "3.0.19"
 
     stats = {}
 
@@ -2607,12 +2608,26 @@ class HPE3PARCommon(object):
             return
         except hpeexceptions.HTTPNotFound as e:
             if 'host does not exist' in e.get_description():
-                # use the wwn to see if we can find the hostname
-                hostname = self._get_3par_hostname_from_wwn_iqn(wwn, iqn)
-                # no 3par host, re-throw
-                if hostname is None:
-                    LOG.error(_LE("Exception: %s"), e)
-                    raise
+                # If a host is failed-over, we want to allow the detach to
+                # 'succeed' when it cannot find the host. We can simply
+                # return out of the terminate connection in order for things
+                # to be updated correctly.
+                if self._active_backend_id:
+                    LOG.warning(_LW("Because the host is currently in a "
+                                    "failed-over state, the volume will not "
+                                    "be properly detached from the primary "
+                                    "array. The detach will be considered a "
+                                    "success as far as Cinder is concerned. "
+                                    "The volume can now be attached to the "
+                                    "secondary target."))
+                    return
+                else:
+                    # use the wwn to see if we can find the hostname
+                    hostname = self._get_3par_hostname_from_wwn_iqn(wwn, iqn)
+                    # no 3par host, re-throw
+                    if hostname is None:
+                        LOG.error(_LE("Exception: %s"), e)
+                        raise
             else:
                 # not a 'host does not exist' HTTPNotFound exception, re-throw
                 LOG.error(_LE("Exception: %s"), e)