Oracle RAC:
A RAC database allows multiple instances residing on different(usually) servers (which are) in a cluster to access a common database residing on shared storage.
All the servers communicate to the shared storage(where data files, control and redo files are stored) via storage network.
The Servers in the clusters are bound together using cluster management software called ORACLE CLUSTERWARE-- this enables the server to look as though they are single server for the applications.
Clusters require special software often referred to as clusterware, in RAC this is Oracle Clusterware is done by Cluster Ready Services(CRS) in 10g release.
Oracle clusterware stores configuration information
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