[storwize]:Fixed check_flashcopy_rate issues

Fixed issues in check_flashcopy_rate that impacts the performance
during bulk Group Snapshot/Clone operations.

check_flashcopy_rate will not make lssystem calls everytime,
instead it uses code_level.

closes bug: #1890586

Change-Id: Icae65dd2473340450c1ff4135f1da86a884ea545

cinder/tests/unit/volume/drivers/ibm/test_storwize_svc.py

@@ -8364,6 +8364,32 @@ class StorwizeHelpersTestCase(test.TestCase):
         self.storwize_svc_common.pretreatment_before_revert(vol)
         stopfcmap.assert_called_once_with('4', split=True)
 
+    def test_storwize_check_flashcopy_rate_invalid1(self):
+        with mock.patch.object(storwize_svc_common.StorwizeHelpers,
+                               'get_system_info') as get_system_info:
+            fake_system_info = {'code_level': (7, 6, 0, 0),
+                                'topology': 'standard',
+                                'system_name': 'storwize-svc-sim',
+                                'system_id': '0123456789ABCDEF'}
+            get_system_info.return_value = fake_system_info
+            flashcopy_rate = 120
+            self.assertRaises(exception.VolumeDriverException,
+                              self.storwize_svc_common.check_flashcopy_rate,
+                              flashcopy_rate)
+
+    def test_storwize_check_flashcopy_rate_invalid2(self):
+        with mock.patch.object(storwize_svc_common.StorwizeHelpers,
+                               'get_system_info') as get_system_info:
+            fake_system_info = {'code_level': (7, 8, 1, 2),
+                                'topology': 'standard',
+                                'system_name': 'storwize-svc-sim',
+                                'system_id': '0123456789ABCDEF'}
+            get_system_info.return_value = fake_system_info
+            flashcopy_rate = 200
+            self.assertRaises(exception.InvalidInput,
+                              self.storwize_svc_common.check_flashcopy_rate,
+                              flashcopy_rate)
+
 
 @ddt.ddt
 class StorwizeSSHTestCase(test.TestCase):

cinder/volume/drivers/ibm/storwize_svc/storwize_svc_common.py

@@ -747,6 +747,7 @@ class StorwizeHelpers(object):
     def __init__(self, run_ssh):
         self.ssh = StorwizeSSH(run_ssh)
         self.check_fcmapping_interval = 3
+        self.code_level = None
 
     @staticmethod
     def handle_keyerror(cmd, out):
@@ -1951,18 +1952,20 @@ class StorwizeHelpers(object):
         return volume_model_updates
 
     def check_flashcopy_rate(self, flashcopy_rate):
-        sys_info = self.get_system_info()
-        code_level = sys_info['code_level']
+        if not self.code_level:
+            sys_info = self.get_system_info()
+            self.code_level = sys_info['code_level']
+
         if flashcopy_rate not in range(1, 151):
             raise exception.InvalidInput(
                 reason=_('The configured flashcopy rate should be '
                          'between 1 and 150.'))
-        elif code_level < (7, 8, 1, 0) and flashcopy_rate > 100:
+        elif self.code_level < (7, 8, 1, 0) and flashcopy_rate > 100:
             msg = (_('The configured flashcopy rate is %(fc_rate)s, The '
                      'storage code level is %(code_level)s, the flashcopy_rate'
                      ' range is 1-100 if the storwize code level '
                      'below 7.8.1.') % {'fc_rate': flashcopy_rate,
-                                        'code_level': code_level})
+                                        'code_level': self.code_level})
             LOG.error(msg)
             raise exception.VolumeDriverException(message=msg)
 

releasenotes/notes/bug-1890586-storwize-check_flashcopy_rate-fix-571e6e182b604725.yaml

@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    `Bug #1890586 <https://bugs.launchpad.net/cinder/+bug/1890586>`_:
+    IBM Storwize: Fixed issues in check_flashcopy_rate that impacts
+    the performance during Group Snapshot/Clone operations for bulk
+    volumes.