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

with RAC environment

error:

INF - RMAN-03009: failure of backup command on ch00 channel at 06/04/2011 13:50:04
INF - ORA-00245: control file backup failed; target is likely on a local file system


check your SNAPSHOT CONTROLFILE parameter with RMAN
replace parameter shared location  or ASM location.



[oracle@testdb01 oracle]$ rman 

RMAN> connect target /

RMAN> show SNAPSHOT CONTROLFILE NAME;

CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/11.2.0.3/db_1/dbs/snapcf_testdb1.f'; # default

RMAN> CONFIGURE SNAPSHOT CONTROLFILE NAME TO '+DATADG/snapcf_testdb.f';