Use CVU to verify that your system is prepared for configuration changes before using Oracle DBCA to create Oracle RAC databases.

1. To use Oracle Database Configuration Assistant (Oracle DBCA) to change the database configuration, run Cluster Verification Utility (CVU) to verify that your system is prepared for configuration changes using the following command syntax:

   /u01/app/21.0.0/grid/bin/cluvfy stage -pre dbcfg -fixup -n node_list -d ORACLE_HOME [-verbose]
   

   In the preceding syntax example, the variable node_list is the list of nodes in your cluster, separated by commas, and the variable ORACLE_HOME is the path for the Oracle home directory where OUI creates or modifies the database. The -fixup flag generates a fixup script that can be run as root to resolve many operating system configuration tasks if they were not completed before you run the check.

2. To verify that your system is prepared for an Oracle Database with Oracle Real Application Clusters (Oracle RAC) installation on a two-node cluster with nodes node1 and node2, with the Oracle Grid Infrastructure home path/u01/app/21.0.0/grid, and with the Oracle home path /u01/app/oracle/product/21.0.0/dbhome_1, enter the following command:

   $ /u01/app/21.0.0/grid/bin/cluvfy stage -pre dbcfg -fixup -n node1,node2 -d 
   /u01/app/oracle/product/21.0.0/dbhome_1
   

   You can select the option -verbose to receive progress updates as CVU performs its system checks, and detailed reporting of the test results.

   If the CVU summary indicates that the cluster verification check fails, and you cannot resolve these issues by running the fixup script, then review and correct the relevant system configuration steps, and run the test again.