WebLogic 11g and Oracle RAC with GridLink DataSource

At the origin there was the OCI Driver, natively supporting TAF (transparent application failover)

In the old days people used to use MultiDataSources to connect to RAC.

This had several disadvantages which are explained in the links below.

The new way seems to be the GridLink data source.

Overall description here:

http://docs.oracle.com/cd/E17904_01/web.1111/e13737/gridlink_datasources.htm#JDBCA373

Detailed configuration instructions here:
http://www.oracle.com/technetwork/middleware/weblogic/wls-jdbc-gridlink-howto-333331.html

When creating a GridLink DS, this page is a bit puzzling:

ONS means Oracle Notification Service, which is part of the Oracle DB installation (NOT of WebLogic).

FAN means Fast Application Notification