For any technical or non-technical reason, you may want to downgrade a successful or failed upgrade of Oracle Clusterware 11gR2 to the previous version as it was before 11g R2. In order to do so, you will need to complete the following downgrade procedure.
1. As root, navigate through the
$GRID_HOME/crs/install
directory and execute therootcrs.pl downgrade
script on all nodes in a cluster. This script will stop the resources and shut down the cluster stack on the node./u01/app/11.2.0/grid/crs/install/rootcrs.pl downgrade [-force]
2. Use the
-force
flag to stop partial or failed 11gR2 upgrades. However, this command neither resets the OCR nor deletesocr.loc
.3. After the
rootcrs.pl downgrade
script is successfully executed on all nodes, as the root user on the local Node 1 of the cluster, you will need to navigate through theRID_HOME/crs/install
directory and execute the following sample command:/u01/app/11.2.0/grid/crs/install/rootcrs.pl...