SQL> select db_unique_name,database_role,open_mode from v$database;
DB_UNIQUE_ DATABASE_ROLE OPEN_MODE
---------- ---------------- --------------------
turkey_un PRIMARY READ WRITE

[oracle@oracle-stbydbs]$ rman target sys/free2go@turkey auxiliary sys/free2go@india
Recovery Manager: Release 11.2.0.1.0 - Production on Thu Jul 26 18:41:06 2012
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: ORCL (DBID=1316772835)
connected to auxiliary database: ORCL (not mounted)

RMAN> duplicate target database for standby from active database;

Starting Duplicate Db at 26-JUL-12
using target database control file instead of recovery catalog
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=19 device type=DISK
...
contents of Memory Script:
{
   backup as copy current controlfile for standby auxiliary format  '/u02/app/oracle/oradata/orcl/control01.ctl';
   restore clone controlfile to  '/u02/app/oracle/flash_recovery_area/orcl/control02.ctl' from
 '/u02/app/oracle/oradata/orcl/control01.ctl';
}
executing Memory Script
....
sql statement: alter database mount standby database
...
Starting backup at 26-JUL-12
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00001 name=/u01/app/oracle/oradata/orcl/system01.dbf
output file name=/u02/app/oracle/oradata/orcl/system01.dbf tag=TAG20120726T160751
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:01:04
channel ORA_DISK_1: starting datafile copy
...
sql statement: alter system archive log current
contents of Memory Script:
{
   switch clone datafile all;
}
executing Memory Script
datafile 1 switched to datafile copy
input datafile copy RECID=2 STAMP=789667774 file name=/u02/app/oracle/oradata/orcl/system01.dbf
...
Finished Duplicate Db at 26-JUL-12

SQL> alter system set log_archive_dest_2='SERVICE=INDIA LGWR ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=INDIA_UN' scope=both sid='*';
SQL> alter system set log_archive_config= 'DG_CONFIG=(turkey_un,india_un)' scope=both sid='*';
SQL> alter system set log_archive_max_processes=8 scope=both sid='*';

SQL> alter system set fal_server='INDIA' scope=both sid='*';
SQL> alter system set standby_file_management='AUTO' scope=both sid='*';
SQL> alter system set db_file_name_convert= '/u02/app/oracle/oradata/orcl','/u01/app/oracle/oradata/orcl' scope=spfile sid='*';
SQL> alter system set log_file_name_convert= '/u02/app/oracle/oradata/orcl','/u01/app/oracle/oradata/orcl' scope=spfile sid='*';