Oracle 11.2.0.3 RAC DB backup failing with the following error:

Error

Mon Oct 07 01:03:28 2013
Errors in file /u01/app/oracle/diag/rdbms/testdb/TESTDB1/trace/TESTDB1_ora_25286.trc:
ORA-00245: control file backup failed; target is likely on a local file system

Cause

This is down to the snapshot controlfile being on a local disk and it needs to be on a shared disk for all of the cluster in our case we need to put it on our +FLASH ASM diskgroup

FIX

So to fix the issue we need to configure the SNAPSHOT CONTROLFILE to the +FLASH ASM diskgroup in RMAN, this is done as follows:

RMAN> show all;

using target database control file instead of recovery catalog
RMAN configuration parameters for database with db_unique_name TESTDB are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 3;
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP OFF; # default
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/11.2.0.3/dbs/snapcf_TESTDB1.f'; # default

RMAN> configure snapshot controlfile name to '+FLASH/snapcf_TESTDB1.f';

new RMAN configuration parameters:
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '+FLASH/snapcf_TESTDB1.f';
new RMAN configuration parameters are successfully stored

RMAN>
RMAN> show all ;

RMAN configuration parameters for database with db_unique_name TESTDB are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 3;
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP OFF; # default
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '+FLASH/snapcf_TESTDB1.f';

Run a backup and check the file is created in the +FLASH diskgroup using asmcmd

oracle@testdb01tst /export/home/oracle $ asmcmd
ASMCMD> ls
DATA/
FLASH/
ASMCMD> cd FLASH/
ASMCMD> ls -l
Type         Redund  Striped  Time             Sys  Name
Y    TESTDB/
Y    TESTDBTST/
N    snapcf_testdb1.f => +FLASH/TESTDB/CONTROLFILE/Backup.302.828871329