Add config for netapp asynchronous SnapMirror schedule

Asynchronous SnapMirror schedules are now possible to configure
using netapp option 'netapp_snapmirror_schedule'. Admin must make
sure schedule is already defined on backend filer.

Closes-bug: #1996750
Change-Id: I0390f82dfdc130d49e3af6928996dd730e3cf69f

manila/share/drivers/netapp/dataontap/cluster_mode/data_motion.py

@@ -186,13 +186,14 @@ class DataMotionSession(object):
             source_share_obj)
 
         # 1. Create SnapMirror relationship
-        # TODO(ameade): Change the schedule from hourly to a config value
+        config = get_backend_configuration(dest_backend)
+        schedule = config.netapp_snapmirror_schedule
         dest_client.create_snapmirror_vol(src_vserver,
                                           src_volume_name,
                                           dest_vserver,
                                           dest_volume_name,
                                           relationship_type,
-                                          schedule='hourly')
+                                          schedule=schedule)
 
         # 2. Initialize async transfer of the initial data
         dest_client.initialize_snapmirror_vol(src_vserver,
@@ -475,14 +476,14 @@ class DataMotionSession(object):
                                                        replica_vserver)
 
         # 3. create
-        # TODO(ameade): Update the schedule if needed.
         relationship_type = na_utils.get_relationship_type(is_flexgroup)
+        schedule = replica_config.netapp_snapmirror_schedule
         replica_client.create_snapmirror_vol(new_src_vserver,
                                              new_src_volume_name,
                                              replica_vserver,
                                              replica_volume_name,
                                              relationship_type,
-                                             schedule='hourly')
+                                             schedule=schedule)
 
         # 4. resync
         replica_client.resync_snapmirror_vol(new_src_vserver,

manila/share/drivers/netapp/options.py

@@ -215,6 +215,14 @@ netapp_data_motion_opts = [
                default=3600,  # One Hour
                help='The maximum time in seconds to wait for a snapmirror '
                     'release when breaking snapmirror relationships.'),
+    cfg.StrOpt('netapp_snapmirror_schedule',
+               default='hourly',  # One Hour
+               help='An interval in either minutes or hours used to update '
+                    'the SnapMirror relationship. Few valid values are: '
+                    '5min, 10min, 30min, hourly etc. The schedule at the '
+                    '"destination" host will be the one that will be '
+                    'considered when creating a new replica, or promoting '
+                    'a replica'),
     cfg.IntOpt('netapp_snapmirror_last_transfer_size_limit',
                min=512,
                default=1024,  # One MB

releasenotes/notes/netapp-add-async-snapmirror-schedule-config-54a33647735f751c.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Added new config option `netapp_snapmirror_schedule` which allows admin to
+    configure netapp asynchronous snapmirror schedule. Admin must make sure
+    schedule is already created on the backend filer.