Recently one of our consultant has upgraded grid and oracle database on Oracle Exadata from 11.2.0.3 to 12.1.0.2. He has shared upgrade instructions as per the Oracle best practice and documentation.
Hope it will help who are planning to upgrade exadata environment.
If proper plan is in place than upgrade activity is not much difficult.
There are five main section for upgrade.
1. Prepare the Existing Environment
2. Install and Upgrade Grid Infrastructure to 12.1.0.2
3. Install Database 12.1.0.2 Software4. Upgrade Database to 12.1.0.2
5. Post-upgrade steps