Multiplexing of CONTROL FILES on RAC database. Process is same for single instance datbase.
1) shutdown database on all nodes; ensure no instance is mounting the database
2) startup nomount one instance
3) rman target /
4) restore controlfile to '+DATA' from '+DATA/PRIMARY/CONTROLFILE/Current.269.764683861';
restore controlfile to '+DATA' from '+DATA/PRIMARY/CONTROLFILE/Current.269.764683861';
repeat for other controlfiles.
check your ASM disk targets... this is only a example
5) sqlplus / as sysdba
6) alter system set control_files='+DATA/PRIMARY/CONTROLFILE/current.753.771970049', '+DATA/PRIMARY/CONTROLFILE/Current.269.764683861',
'+DATA/PRIMARY/CONTROLFILE/current.751.771970043' scope=spfile;
7) shutdown (immediate)
8) srvctl start database -d <database name>
