I received this error when I was trying to install 11.2.0.3 database software in my 2 node cluster employing 11.2.0.3 clusterware.
Reason: clusterware was not up
Solution: Start the clusterware and attempt database software installation again.
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Related Links:
ORA-01102: cannot mount database in EXCLUSIVE mode
ORA-15040: diskgroup is incomplete
PROT-35: The configured Oracle Cluster Registry locations are not accessible
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