DB: Oracle Server: Physical OS: Linux 5.5
The production site contains 3 server nodes and will be clustered using Oracle RAC, database replication will be done with the help of Oracle Data guard. As a minimum, the DR site will have a single physical server working in Physical Standby mode.
The situation: DR environment is also shared by a testing environment, which has 3 database servers in RAC cluster. These servers will have 2 images, one for Testing network and one for DR network. Now, when the actual DR will happen, the Testing image would be shut down and DR image will start working and will join the 1st Physical DR Server node and eventually becomes a 4 node DR.
I want to know the technical difficulty to achieve this and what could be the potential pain points?