diff --git a/tempest/api/compute/admin/test_migrations.py b/tempest/api/compute/admin/test_migrations.py
index 4f075eb..c9ba730 100644
--- a/tempest/api/compute/admin/test_migrations.py
+++ b/tempest/api/compute/admin/test_migrations.py
@@ -47,12 +47,7 @@
         server = self.create_test_server(wait_until="ACTIVE")
         server_id = server['id']
 
-        self.servers_client.resize_server(server_id, self.flavor_ref_alt)
-        waiters.wait_for_server_status(self.servers_client,
-                                       server_id, 'VERIFY_RESIZE')
-        self.servers_client.confirm_resize_server(server_id)
-        waiters.wait_for_server_status(self.servers_client,
-                                       server_id, 'ACTIVE')
+        self.resize_server(server_id, self.flavor_ref_alt)
 
         body = self.client.list_migrations()['migrations']
 
diff --git a/tempest/api/compute/base.py b/tempest/api/compute/base.py
index d8294f7..13c0cb1 100644
--- a/tempest/api/compute/base.py
+++ b/tempest/api/compute/base.py
@@ -345,6 +345,15 @@
             LOG.exception('Failed to delete server %s' % server_id)
 
     @classmethod
+    def resize_server(cls, server_id, new_flavor_id, **kwargs):
+        """resize and confirm_resize an server, waits for it to be ACTIVE."""
+        cls.servers_client.resize_server(server_id, new_flavor_id, **kwargs)
+        waiters.wait_for_server_status(cls.servers_client, server_id,
+                                       'VERIFY_RESIZE')
+        cls.servers_client.confirm_resize_server(server_id)
+        waiters.wait_for_server_status(cls.servers_client, server_id, 'ACTIVE')
+
+    @classmethod
     def delete_volume(cls, volume_id):
         """Deletes the given volume and waits for it to be gone."""
         cls._delete_volume(cls.volumes_extensions_client, volume_id)
diff --git a/tempest/api/compute/servers/test_disk_config.py b/tempest/api/compute/servers/test_disk_config.py
index aba0240..ff8ea6e 100644
--- a/tempest/api/compute/servers/test_disk_config.py
+++ b/tempest/api/compute/servers/test_disk_config.py
@@ -94,12 +94,8 @@
         self._update_server_with_disk_config(server['id'],
                                              disk_config='MANUAL')
         # Resize with auto option
-        self.client.resize_server(server['id'], self.flavor_ref_alt,
-                                  disk_config='AUTO')
-        waiters.wait_for_server_status(self.client, server['id'],
-                                       'VERIFY_RESIZE')
-        self.client.confirm_resize_server(server['id'])
-        waiters.wait_for_server_status(self.client, server['id'], 'ACTIVE')
+        self.resize_server(server['id'], self.flavor_ref_alt,
+                           disk_config='AUTO')
 
         server = self.client.show_server(server['id'])['server']
         self.assertEqual('AUTO', server['OS-DCF:diskConfig'])
@@ -114,12 +110,8 @@
         self._update_server_with_disk_config(server['id'],
                                              disk_config='AUTO')
         # Resize with manual option
-        self.client.resize_server(server['id'], self.flavor_ref_alt,
-                                  disk_config='MANUAL')
-        waiters.wait_for_server_status(self.client, server['id'],
-                                       'VERIFY_RESIZE')
-        self.client.confirm_resize_server(server['id'])
-        waiters.wait_for_server_status(self.client, server['id'], 'ACTIVE')
+        self.resize_server(server['id'], self.flavor_ref_alt,
+                           disk_config='MANUAL')
 
         server = self.client.show_server(server['id'])['server']
         self.assertEqual('MANUAL', server['OS-DCF:diskConfig'])