bug 5147: Adding the check to block create and destroy of system resources whilst the storage pool is in maintenance mode. This is based on checking if the pool is in UP state

server/src/com/cloud/storage/allocator/AbstractStoragePoolAllocator.java

@@ -142,7 +142,12 @@ public abstract class AbstractStoragePoolAllocator extends AdapterBase implement
             return false;
         }
             
-		
+		//if pool is NOT in up state, return false
+        if(!pool.getStatus().equals(com.cloud.host.Status.Up))//this is the pool status
+        {
+        	return false;
+        }	
+        
 		// Check that the pool type is correct
 		if (!poolIsCorrectType(dskCh, pool, vm, offering)) {
 			return false;