diff --git a/engine/api/src/org/apache/cloudstack/storage/datastore/db/StoragePoolVO.java b/engine/api/src/org/apache/cloudstack/storage/datastore/db/StoragePoolVO.java
index a8c1e7feb49..941b952baaa 100644
--- a/engine/api/src/org/apache/cloudstack/storage/datastore/db/StoragePoolVO.java
+++ b/engine/api/src/org/apache/cloudstack/storage/datastore/db/StoragePoolVO.java
@@ -203,8 +203,8 @@ public class StoragePoolVO implements StoragePool {
         return capacityBytes;
     }
 
-    public void setUsedBytes(long available) {
-        usedBytes = available;
+    public void setUsedBytes(long usedBytes) {
+        this.usedBytes = usedBytes;
     }
 
     public void setCapacityBytes(long capacityBytes) {
diff --git a/engine/storage/src/org/apache/cloudstack/storage/volume/datastore/PrimaryDataStoreHelper.java b/engine/storage/src/org/apache/cloudstack/storage/volume/datastore/PrimaryDataStoreHelper.java
index 53ead0b99f5..4ea4ceec555 100644
--- a/engine/storage/src/org/apache/cloudstack/storage/volume/datastore/PrimaryDataStoreHelper.java
+++ b/engine/storage/src/org/apache/cloudstack/storage/volume/datastore/PrimaryDataStoreHelper.java
@@ -113,7 +113,7 @@ public class PrimaryDataStoreHelper {
 
         StoragePoolVO pool = this.dataStoreDao.findById(store.getId());
         pool.setScope(scope.getScopeType());
-        pool.setUsedBytes(existingInfo.getAvailableBytes());
+        pool.setUsedBytes(existingInfo.getCapacityBytes() - existingInfo.getAvailableBytes());
         pool.setCapacityBytes(existingInfo.getCapacityBytes());
         pool.setStatus(StoragePoolStatus.Up);
         this.dataStoreDao.update(pool.getId(), pool);