code: public long getGlobalDataSizeDirectly() throws QuotaManagerException
     {
        long size = 0;
        for (RepositoryQuotaManager rqm : rQuotaManagers.values())
        {
           size += rqm.getRepositoryDataSizeDirectly();
        }
  
        return size;
     }
docs: Calculates the global size by summing sized of all repositories.