Oracle Real Application Cluster Use Case

Note:

Check the Oracle Database installation documentation for Linux to verify that the platform is certified for use with the current Oracle Linux release: https://docs.oracle.com/en/database/oracle/oracle-database/index.html.

Oracle Real Application Cluster (RAC) uses its own cluster stack, Cluster Synchronization Services (CSS). You can use O2CB with CSS, but note that each stack is configured independently for timeouts, nodes, and other cluster settings. You can use OCFS2 to host the voting disk files and the Oracle cluster registry (OCR), but not the grid infrastructure user's home, which must exist on a local file system on each node.

Because both CSS and O2CB use the lowest node number as a tie breaker in quorum calculations, ensure that the node numbers are the same in both clusters. If required, edit the O2CB configuration file, /etc/ocfs2/cluster.conf, to make the node numbering consistent. Then, update this file on all the nodes. The change takes effect when the cluster is restarted.