Managing control files in ASM

Just a couple of notes on how to create multiple ASM control files and moving control files toa different diskgroup.

Assuming we already have a ASM control file in the DATA diskgroup and we wish to add one to the FRA diskgroup

 SQL>show parameter control_files
+DATA/SID/controlfile/current.730.698514673
alter system set control_files='+DATA','+FRA' scope=spfile;
shutdown immediate;
startup nomount;
exit
rman target
/restore controlfile from '+DATAHR/MHRPRD1A/CONTROLFILE/current.730.698514673';
alter database mount;
alter database open;
SQL>show parameter control_files
+DATA/SID/controlfile/current.730.698514673, +FRAHR/SID/controlfile/current.766.698514673

 
                                                                           

Here is an example of how to migrate from one ASM diskgroup to another

Add the new disk discovery path in (if needed), create a diskgroup and add disks

alter system set asm_diskstring='/dev/oracle','/dev/oracle_hr/r*';

create diskgroup DATANEW  external redundancy disk '/dev/oracle_hr/rdisk1','/dev/oracle_hr/rdisk2';

SQL>show parameter control_files

control_files                        string      +DATA10/SID/controlfile/c urrent.796.695384211
alter system set CONTROL_FILES = '+DATANEW' scope=spfile

shutdown
rman target /
startup nomount
restore controlfile  from  '/+DATA/SID/controlfile/current.796.695384211';
alter database mount;
alter database open;

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