How to move disks inside ASM diskgroups

Simple commands (without any details go as follow). Modify the datafile names to suit your own needs. These files do not use OMF and hence full filename needs to said during RMAN commands.

Locate file which needs to be moved;
SQL> SELECT file_name FROM dba_data_files;


Take the file offline;
SQL> ALTER DATABASE DATAFILE '+DATA/database/datafile/db_name_data01.dbf' OFFLINE;


Log on to RMAN
OS> rman target / 


Copy the datafile to new location
RMAN> COPY DATAFILE '+DATA/database/datafile/db_name_data01.dbf' TO '+DATA_DISK_GROUP_1/database/datafile/db_name_data01.dbf';


Log on to SQL to rename the file again
SQL> ALTER DATABASE RENAME FILE '+DATA/database/datafile/db_name_data01.dbf' TO '+DATA_DISK_GROUP_1/database/datafile/db_name_data01.dbf';


Log on to RMAN
OS> rman target /

Switch datafile
RMAN> SWITCH DATAFILE '+DATA_DISK_GROUP_1/database/datafile/db_name_data01.dbf' TO COPY;

Log on to SQL  to recover and put the file online again.

SQL> RECOVER DATAFILE '+DATA_DISK_GROUP_1/database/datafile/db_name_data01.dbf';
SQL> ALTER DATABASE DATAFILE '+DATA_DISK_GROUP_1/database/datafile/db_name_data01.dbf' ONLINE;

Done.

Solution for ORA-00245: control file backup failed; target is likely on a local file system

In case you encounter following RMAN errors
2014.08.24 20:30:38 ORA-00245: control file backup failed; target is likely on a local file system

It's because you placed your control file backups on local disk and that's as Oracle error defines, not suitable solution RAC environment. You may check you'r current configuration by issuing RMAN> show all; -command.

Solution for this error easy, just re-configure RMAN to place a snapshot controlfile copy to a shared location (e.g. ASM disk group):

RMAN> configure snapshot controlfile name to '+DBPROD_DATA/CONTROLFILE/snapcf_dbname.f';

or

RMAN> configure snapshot controlfile name to '+DBPROD_DATA/CLUSTER/CONTROLFILE/snapcf_dbname.f';

depending on your setup.