[Installing Oracle DataBase Server 11.2.0.3 on Oracle Linux 6.3]: Multiplexing Controlfiles
$ mkdir -p /u02/oradata/${ORACLE_SID}/control
$ mkdir -p /u03/oradata/${ORACLE_SID}/control
$ sqlplus / as sysdba
SQL> select name from v$CONTROLFILE;
NAME
--------------------------------------------------------------------------------
/u02/oradata/ora112/control01.ctl
/u02/oradata/ora112/control02.ctl
SQL> shutdown immediate;
SQL> quit
$ cp /u02/oradata/ora112/control01.ctl /u02/oradata/${ORACLE_SID}/control/control01.ctl
$ cp /u02/oradata/ora112/control01.ctl /u02/oradata/${ORACLE_SID}/control/control02.ctl
$ cp /u02/oradata/ora112/control01.ctl /u03/oradata/${ORACLE_SID}/control/control03.ctl
$ sqlplus / as sysdba
SQL> startup nomount;
SQL> ALTER SYSTEM SET control_files = '/u02/oradata/ora112/control/control01.ctl', '/u02/oradata/ora112/control/control02.ctl', '/u03/oradata/ora112/control/control03.ctl' scope=spfile;
SQL> shutdown immediate;
SQL> startup;
SQL> SELECT name FROM v$CONTROLFILE;
NAME
--------------------------------------------------------------------------------
/u02/oradata/ora112/control/control01.ctl
/u02/oradata/ora112/control/control02.ctl
/u03/oradata/ora112/control/control03.ctl
SQL> quit
Delete old controlfiles
$ rm /u02/oradata/ora112/control01.ctl
$ rm /u02/oradata/ora112/control02.ctl