"Most existing database clustering solutions rely on a shared disk storage to maintain their cluster state, as can be seen in the diagram below."
In the case of RAC, although state is written to a file called 'voting disk', the actual state of the cluster is communicated through a high speed inter connect which is redundant. Only if the network connection(s) are down, state is exchanged through the 'voting disk'.
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"Most existing database clustering solutions rely on a shared disk storage to maintain their cluster state, as can be seen in the diagram below."
In the case of RAC, although state is written to a file called 'voting disk', the actual state of the cluster is communicated through a high speed inter connect which is redundant. Only if the network connection(s) are down, state is exchanged through the 'voting disk'.