diff --git a/Cinder/Mitaka/huawei_driver.py b/Cinder/Mitaka/huawei_driver.py
index 00f3729..5cd90c5 100644
--- a/Cinder/Mitaka/huawei_driver.py
+++ b/Cinder/Mitaka/huawei_driver.py
@@ -745,7 +745,7 @@ def _common_create_volume(self, volume, src_obj=None, src_type=None,
             huawei_lun_wwn=lun_info.get('WWN'), hypermetro=hypermetro)
         model_update = {'provider_location': provider_location}
         model_update.update(replica_info)
-
+        huawei_utils.set_volume_lun_wwn(model_update, lun_info, volume)
         return model_update
 
     def create_volume(self, volume):
@@ -1995,6 +1995,7 @@ def manage_existing(self, volume, external_ref):
 
         model_update['provider_location'] = huawei_utils.to_string(
             **provider_location)
+        huawei_utils.set_volume_lun_wwn(model_update, lun_info, volume)
         return model_update
 
     def _get_lun_info_by_ref(self, external_ref):
@@ -3193,12 +3194,6 @@ def lock_host_when_terminate_connection():
 
     def _terminate_connection_locked(self, volume, connector, **kwargs):
         """Delete map between a volume and a host."""
-        attachments = volume.volume_attachment
-        if volume.multiattach and len(attachments) > 1 and sum(
-                1 for a in attachments if a.connector == connector) > 1:
-            LOG.info("Volume is multi-attach and attached to the same host"
-                     " multiple times")
-            return
 
         metadata = huawei_utils.get_lun_metadata(volume)
         LOG.info("terminate_connection, metadata is: %s.", metadata)
@@ -3514,12 +3509,6 @@ def lock_host_when_terminate_connection(volume, connector):
 
     def _terminate_connection_locked(self, volume, connector, **kwargs):
         """Delete map between a volume and a host."""
-        attachments = volume.volume_attachment
-        if volume.multiattach and len(attachments) > 1 and sum(
-                1 for a in attachments if a.connector == connector) > 1:
-            LOG.info("Volume is multi-attach and attached to the same host"
-                     " multiple times")
-            return {}
 
         lun_id, lun_type = self.get_lun_id_and_type(
             volume, constants.VOLUME_NOT_EXISTS_WARN)
diff --git a/Cinder/Mitaka/huawei_utils.py b/Cinder/Mitaka/huawei_utils.py
index 7faba56..87807ae 100644
--- a/Cinder/Mitaka/huawei_utils.py
+++ b/Cinder/Mitaka/huawei_utils.py
@@ -107,6 +107,12 @@ def get_volume_metadata(volume):
     return {}
 
 
+def set_volume_lun_wwn(model_update, lun_info, volume):
+    metadata = get_volume_metadata(volume)
+    metadata['lun_wwn'] = lun_info.get('WWN')
+    model_update.update({"metadata": metadata})
+
+
 def get_admin_metadata(volume):
     admin_metadata = {}
     if 'admin_metadata' in volume:
diff --git a/Cinder/Newton/huawei_driver.py b/Cinder/Newton/huawei_driver.py
index bce97e7..097cff2 100644
--- a/Cinder/Newton/huawei_driver.py
+++ b/Cinder/Newton/huawei_driver.py
@@ -3193,12 +3193,6 @@ def lock_host_when_terminate_connection():
 
     def _terminate_connection_locked(self, volume, connector, **kwargs):
         """Delete map between a volume and a host."""
-        attachments = volume.volume_attachment
-        if volume.multiattach and len(attachments) > 1 and sum(
-                1 for a in attachments if a.connector == connector) > 1:
-            LOG.info("Volume is multi-attach and attached to the same host"
-                     " multiple times")
-            return
 
         metadata = huawei_utils.get_lun_metadata(volume)
         LOG.info("terminate_connection, metadata is: %s.", metadata)
@@ -3514,12 +3508,6 @@ def lock_host_when_terminate_connection(volume, connector):
 
     def _terminate_connection_locked(self, volume, connector, **kwargs):
         """Delete map between a volume and a host."""
-        attachments = volume.volume_attachment
-        if volume.multiattach and len(attachments) > 1 and sum(
-                1 for a in attachments if a.connector == connector) > 1:
-            LOG.info("Volume is multi-attach and attached to the same host"
-                     " multiple times")
-            return {}
 
         lun_id, lun_type = self.get_lun_id_and_type(
             volume, constants.VOLUME_NOT_EXISTS_WARN)
diff --git a/Cinder/Ocata/huawei_driver.py b/Cinder/Ocata/huawei_driver.py
index 6f7b0ad..2207102 100644
--- a/Cinder/Ocata/huawei_driver.py
+++ b/Cinder/Ocata/huawei_driver.py
@@ -3193,12 +3193,6 @@ def lock_host_when_terminate_connection():
 
     def _terminate_connection_locked(self, volume, connector, **kwargs):
         """Delete map between a volume and a host."""
-        attachments = volume.volume_attachment
-        if volume.multiattach and len(attachments) > 1 and sum(
-                1 for a in attachments if a.connector == connector) > 1:
-            LOG.info("Volume is multi-attach and attached to the same host"
-                     " multiple times")
-            return
 
         metadata = huawei_utils.get_lun_metadata(volume)
         LOG.info("terminate_connection, metadata is: %s.", metadata)
@@ -3514,12 +3508,6 @@ def lock_host_when_terminate_connection(volume, connector):
 
     def _terminate_connection_locked(self, volume, connector, **kwargs):
         """Delete map between a volume and a host."""
-        attachments = volume.volume_attachment
-        if volume.multiattach and len(attachments) > 1 and sum(
-                1 for a in attachments if a.connector == connector) > 1:
-            LOG.info("Volume is multi-attach and attached to the same host"
-                     " multiple times")
-            return {}
 
         lun_id, lun_type = self.get_lun_id_and_type(
             volume, constants.VOLUME_NOT_EXISTS_WARN)
diff --git a/Cinder/Pike/huawei_driver.py b/Cinder/Pike/huawei_driver.py
index 256e298..0b87b5e 100644
--- a/Cinder/Pike/huawei_driver.py
+++ b/Cinder/Pike/huawei_driver.py
@@ -3193,12 +3193,6 @@ def lock_host_when_terminate_connection():
 
     def _terminate_connection_locked(self, volume, connector, **kwargs):
         """Delete map between a volume and a host."""
-        attachments = volume.volume_attachment
-        if volume.multiattach and len(attachments) > 1 and sum(
-                1 for a in attachments if a.connector == connector) > 1:
-            LOG.info("Volume is multi-attach and attached to the same host"
-                     " multiple times")
-            return
 
         metadata = huawei_utils.get_lun_metadata(volume)
         LOG.info("terminate_connection, metadata is: %s.", metadata)
@@ -3514,12 +3508,6 @@ def lock_host_when_terminate_connection(volume, connector):
 
     def _terminate_connection_locked(self, volume, connector, **kwargs):
         """Delete map between a volume and a host."""
-        attachments = volume.volume_attachment
-        if volume.multiattach and len(attachments) > 1 and sum(
-                1 for a in attachments if a.connector == connector) > 1:
-            LOG.info("Volume is multi-attach and attached to the same host"
-                     " multiple times")
-            return {}
 
         lun_id, lun_type = self.get_lun_id_and_type(
             volume, constants.VOLUME_NOT_EXISTS_WARN)
diff --git a/RELEASE.md b/RELEASE.md
index 3a28426..5c59626 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,3 +1,61 @@
+# 2.6.4
+## Mappings between Driver and OpenStack versions
+
+| OpenStack |Mitaka|Newton|Ocata|Pike|Queens|Rocky|Stein|Train|Ussuri|Victoria|Wallaby|Xena|Yoga|Zed|Antelope|Bobcat
+|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
+|Cinder Driver|√|√|√|√|√|√|√|√|√|√|√|√|√|√|√|√|
+|Manila Driver|√|√|√|√|√|√|√|√|√|√|√|√|√|√|√|×|
+
+
+We have tested OpenStack Newton with OceanStor Dorado V6 6.1.3
+## Version mappings among Cinder Driver, Huawei storage, and OpenStack
+| OpenStack |Huawei Storage|
+|---|---|
+|Cinder Driver|OceanStor V5 V500R007C61/V500R007C70/V500R007C71|
+| |OceanStor V6 6.1.3/6.1.5/6.1.6/6.1.7
+| |OceanStor Dorado V3 V300R002C10/V300R002C20|
+| |OceanStor Dorado V6 6.1.0/6.1.2/6.1.3/6.1.5/6.1.6/6.1.7
+
+## Version mappings among Manila Driver, Huawei storage, and OpenStack
+| OpenStack |Huawei Storage|
+|---|---|
+|Manila Driver|OceanStor V5 V500R007C61/V500R007C70|
+| |OceanStor V6 6.1.3/6.1.5/6.1.6
+| |OceanStor Dorado V6 6.1.0/6.1.2/6.1.3/6.1.5/6.1.6
+
+## Version mappings among PowerVC, Huawei storage, and OpenStack
+| OpenStack |Huawei Storage|
+|---|---|
+|IBM PowerVC 2.0.0/2.0.1/2.0.2/2.0.3/2.1.0/2.1.1/2.2.0|OceanStor DoradoV3 V300R002|
+| |OceanStor V5 V500R007
+| |OceanStor V6 6.1.3/6.1.5/6.1.6
+| |OceanStor Dorado V6 6.1.0/6.1.2/6.1.3/6.1.5/6.1.6
+
+# 2.6.3
+## Mappings between Driver and OpenStack versions
+
+| OpenStack |Mitaka|Newton|Ocata|Pike|Queens|Rocky|Stein|Train|Ussuri|Victoria|Wallaby|Xena|Yoga|Zed|Antelope|
+|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
+|Cinder Driver|√|√|√|√|√|√|√|√|√|√|√|√|√|√|√|
+|Manila Driver|√|√|√|√|√|√|√|√|√|√|√|√|√|√|√|
+
+
+We have tested OpenStack Newton with OceanStor Dorado V6 6.1.3
+## Version mappings among Cinder Driver, Huawei storage, and OpenStack
+| OpenStack |Huawei Storage|
+|---|---|
+|Cinder Driver|OceanStor V5 V500R007C61/V500R007C70/V500R007C71|
+| |OceanStor V6 6.1.3/6.1.5/6.1.6
+| |OceanStor Dorado V3 V300R002C10/V300R002C20|
+| |OceanStor Dorado V6 6.1.0/6.1.2/6.1.3/6.1.5/6.1.6
+
+## Version mappings among Manila Driver, Huawei storage, and OpenStack
+| OpenStack |Huawei Storage|
+|---|---|
+|Manila Driver|OceanStor V5 V500R007C61/V500R007C70|
+| |OceanStor V6 6.1.3/6.1.5/6.1.6
+| |OceanStor Dorado V6 6.1.0/6.1.2/6.1.3/6.1.5/6.1.6
+
 # 2.6.2
 ## Mappings between Driver and OpenStack versions