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Clusterware Architecture:

In Clusterware Architecture there are 2 important files are

1) OCR - oracle cluster Registry.

2)  Voting Disks

The above 2 files are stored in shared storage either in Raw Partitions or CFS(Cluster File Registry)

>   From 11gR2 , we need to store in CFS or Asm Disk Groups (directly placed in raw has been de-supported)

>  OCR File: 
             Oracle Cluster Registry contains the information of  like node names,Ip's Configuration Databases,Listeners ,Services etc that are registered with the cluster.

--> Various clients  of OCR are

1) DBCA

2) SRVCTL

3) Enterprise Manager Console

4) VIPCA

5)NETCA


In Order to optimize the performance of the queries on OCR, Oracle RAC follows Distributed "OCR-Cache " Architecture means every node that is participating in cluster maintains a local copy of OCR file in the local memory which is called oracle cache.

OcrCache  --->  Ocr Process --> Ocr client  into the OCR File.

2) Voting Disks:

              Oracle Rac uses the Voting Disk to manage  cluster membership by way of a health check and artibrates cluster ownership among the instances in case of Network failures . The voting Disk must reside in share disk.