[Installing Oracle DataBase Server 11.2.0.3 on Oracle Linux 6.3]: Multiplexing Archivelogs
Creating a directory for storing backup files and archive logs
$ mkdir -p /u02/oradata/${ORACLE_SID}/archivelogs
$ mkdir -p /u03/oradata/${ORACLE_SID}/archivelogs
$ sqlplus / as sysdba
Set directories for archive logs
SQL> ALTER SYSTEM SET LOG_ARCHIVE_DEST_1='location=/u02/oradata/ora112/archivelogs mandatory' scope=both;
SQL> ALTER SYSTEM SET LOG_ARCHIVE_DEST_2='location=/u03/oradata/ora112/archivelogs mandatory' scope=both;
View current values of the LOG_ARCHIVE_DEST parameter
SQL> show parameter LOG_ARCHIVE_DEST;
Set format for archivelog files
SQL> ALTER SYSTEM SET LOG_ARCHIVE_FORMAT='%t_%s_%R.arc' scope=spfile;
SQL> quit