Dell EMC PS: Fix over-subscription ratio stats

Fixed the provisioned_capacity_gb to use the VolumeReportedSpace
to calculate the over-subscription ratio stats in the Dell EMC
PS volume driver.

Closes Bug: #1719659

Change-Id: I2caa5f2763ec343b0bc875e707924ff9b6424ce5

cinder/tests/unit/volume/drivers/dell_emc/test_ps.py

@@ -58,7 +58,7 @@ class PSSeriesISCSIDriverTestCase(test.TestCase):
 
         self.driver_stats_output = ['TotalCapacity: 111GB',
                                     'FreeSpace: 11GB',
-                                    'VolumeReserve: 80GB',
+                                    'VolumeReportedSpace: 80GB',
                                     'TotalVolumes: 100']
         self.cmd = 'this is dummy command'
         self._context = context.get_admin_context()

cinder/volume/drivers/dell_emc/ps.py

@@ -137,10 +137,11 @@ class PSSeriesISCSIDriver(san.SanISCSIDriver):
         1.4.1 - Rebranded driver to Dell EMC.
         1.4.2 - Enable report discard support.
         1.4.3 - Report total_volumes in volume stats
+        1.4.4 - Fixed over-subscription ratio calculation
 
     """
 
-    VERSION = "1.4.3"
+    VERSION = "1.4.4"
 
     # ThirdPartySytems wiki page
     CI_WIKI_NAME = "Dell_Storage_CI"
@@ -315,7 +316,7 @@ class PSSeriesISCSIDriver(san.SanISCSIDriver):
             if line.startswith('FreeSpace:'):
                 out_tup = line.rstrip().partition(' ')
                 data['free_capacity_gb'] = self._get_space_in_gb(out_tup[-1])
-            if line.startswith('VolumeReserve:'):
+            if line.startswith('VolumeReportedSpace:'):
                 out_tup = line.rstrip().partition(' ')
                 provisioned_capacity = self._get_space_in_gb(out_tup[-1])
             if line.startswith('TotalVolumes:'):

releasenotes/notes/ps-over-subscription-ratio-cal-8aa447c50f2474a8.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Dell EMC PS Driver stats report has been fixed, now reports the
+    `provisioned_capacity_gb` properly. Fixes bug 1719659.