To deconfigure Oracle Clusterware:
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Log in as the root user on a node where you encountered an error.
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Change directory to Grid_home/crs/install. For example:
# cd /u01/app/11.2.0/grid/crs/install
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Run rootcrs.pl with the -deconfig -force flags. For example:
# perl rootcrs.pl -deconfig -force
Repeat on other nodes as required.
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If you are deconfiguring Oracle Clusterware on all nodes in the cluster, then on the last node, enter the following command:
# perl rootcrs.pl -deconfig -force -lastnode
The -lastnode flag completes deconfiguration of the cluster, including the OCR and voting disks.