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Oracle Clusterware includes two important components:
1. Voting disk: A file that manages information about node membership
2 OCR (Oracle Cluster Registry): A file that manages cluster and Oracle RAC database configuration information.
These files can be stored on ASM (Automatic Storage Management) or a cluster filesystem.
[Reference]
http://docs.oracle.com/cd/B28359_01/rac.111/b28252/adminoc.htm
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