code: protected ValueDataWrapper readValueData(String identifier, int orderNumber, int type, String storageId)
        throws SQLException, IOException, ValueStorageNotFoundException
     {
        ValueIOChannel channel = this.containerConfig.valueStorageProvider.getChannel(storageId);
        try
        {
           return channel.read(identifier, orderNumber, type, containerConfig.spoolConfig);
        }
        finally
        {
           channel.close();
        }
     }
docs: Read ValueData from External Storage.
  
  @param identifier
  PropertyData
  @param orderNumber
  Value order number
  @param type
  property type
  @param storageId
  external Value storage id
  @return ValueData
  @throws SQLException
  database error
  @throws IOException
  I/O error
  @throws ValueStorageNotFoundException
  if no such storage found with Value storageId