diff --git a/engine/storage/volume/src/org/apache/cloudstack/storage/datastore/provider/DefaultHostListener.java b/engine/storage/volume/src/org/apache/cloudstack/storage/datastore/provider/DefaultHostListener.java
index fffd1e815c4..e77d5489cb6 100644
--- a/engine/storage/volume/src/org/apache/cloudstack/storage/datastore/provider/DefaultHostListener.java
+++ b/engine/storage/volume/src/org/apache/cloudstack/storage/datastore/provider/DefaultHostListener.java
@@ -81,7 +81,7 @@ public class DefaultHostListener implements HypervisorHostListener {
         }
 
         StoragePoolVO poolVO = this.primaryStoreDao.findById(poolId);
-        poolVO.setUsedBytes(mspAnswer.getPoolInfo().getAvailableBytes());
+        poolVO.setUsedBytes(mspAnswer.getPoolInfo().getCapacityBytes() - mspAnswer.getPoolInfo().getAvailableBytes());
         poolVO.setCapacityBytes(mspAnswer.getPoolInfo().getCapacityBytes());
         primaryStoreDao.update(pool.getId(), poolVO);
 
diff --git a/plugins/hypervisors/simulator/src/com/cloud/agent/manager/MockStorageManagerImpl.java b/plugins/hypervisors/simulator/src/com/cloud/agent/manager/MockStorageManagerImpl.java
index 69d4baccd86..8e1aaed8470 100644
--- a/plugins/hypervisors/simulator/src/com/cloud/agent/manager/MockStorageManagerImpl.java
+++ b/plugins/hypervisors/simulator/src/com/cloud/agent/manager/MockStorageManagerImpl.java
@@ -362,7 +362,7 @@ public class MockStorageManagerImpl extends ManagerBase implements MockStorageMa
             txn = TransactionLegacy.open(TransactionLegacy.CLOUD_DB);
             txn.close();
         }
-        return new ModifyStoragePoolAnswer(cmd, storagePool.getCapacity(), 0, new HashMap<String, TemplateProp>());
+        return new ModifyStoragePoolAnswer(cmd, storagePool.getCapacity(), storagePool.getCapacity(), new HashMap<String, TemplateProp>());
     }
 
     @Override
@@ -964,7 +964,7 @@ public class MockStorageManagerImpl extends ManagerBase implements MockStorageMa
             }
         }
         return new StoragePoolInfo(storagePool.getUuid(), host.getPrivateIpAddress(), storagePool.getMountPoint(), storagePool.getMountPoint(),
-            storagePool.getPoolType(), storagePool.getCapacity(), 0);
+            storagePool.getPoolType(), storagePool.getCapacity(), storagePool.getCapacity());
     }
 
     @Override