diff --git a/fuelweb_test/tests/test_ha_one_controller.py b/fuelweb_test/tests/test_ha_one_controller.py
index 3c3e79cbc..56b9011ba 100644
--- a/fuelweb_test/tests/test_ha_one_controller.py
+++ b/fuelweb_test/tests/test_ha_one_controller.py
@@ -676,10 +676,7 @@ class NodeDiskSizes(TestBasic):
             for disk in node['meta']['disks']:
                 assert_equal(disk['size'], disk_size, 'Disk size')
 
-        # pylint: disable=round-builtin
-        hdd_size = "{} TB HDD".format(
-            round(((disk_size * 3 / (10 ** 9)) / 1000), 3))
-        # pylint: enable=round-builtin
+        hdd_size = "{} TB HDD".format((disk_size * 3 / (10 ** 9)) / 1000)
         notifications = self.fuel_web.client.get_notifications()
         for node in nailgun_nodes:
             # assert /api/notifications
@@ -688,25 +685,13 @@ class NodeDiskSizes(TestBasic):
                 current_node = notification['node_id'] == node['id']
                 if current_node and discover and \
                    "discovered" in notification['message']:
-                    assert_true(
-                        hdd_size in notification['message'],
-                        '"{size}" not found in notification message '
-                        '"{note}" for node {node} (hostname {host})!'.format(
-                            size=hdd_size,
-                            note=notification['message'],
-                            node=node['name'],
-                            host=node['hostname']
-                        )
-                    )
+                    assert_true(hdd_size in notification['message'])
 
             # assert disks
             disks = self.fuel_web.client.get_node_disks(node['id'])
             for disk in disks:
-                assert_equal(
-                    disk['size'], NODE_VOLUME_SIZE * 1024 - 500,
-                    'Disk size {0} is not equals expected {1}'.format(
-                        disk['size'], NODE_VOLUME_SIZE * 1024 - 500
-                    ))
+                assert_equal(disk['size'],
+                             NODE_VOLUME_SIZE * 1024 - 500, 'Disk size')
 
     @test(depends_on=[NodeMultipleInterfaces.deploy_node_multiple_interfaces],
           groups=["check_nodes_disks"])