I was reading a lot about RMAN but I have some questions about my configuration, I appreciate any help.
I'm using on Linux, RAC with 2 nodes. I setup another box to use RMAN.
My Flash Recovery Area is in my cluster and is located /u03/flash_recovery_area/OLTP4R/archivelog, there I'm archiving files from both nodes.

I'm trying to make my backups on another directory wich is NFS mounted: '/backup_oltp/'.

These are my RMAN settings:
configure retention policy to redundancy 3;
configure default device type to disk;
configure controlfile autobackup on;
configure device type disk parallelism 2;
configure controlfile autobackup format for device type disk to '/backup_oltp/%F';
configure snapshot controlfile name to '$ORACLE_HOME/dbs/snapcf_ORACLE_SID';
CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT '/backup_oltp/backup_db_%d_S_%s_P_%p_T_%t';
configure channel 1 device type disk connect 'SYS/redclust@oltp4r1';
configure channel 2 device type disk connect 'SYS/redclust@oltp4r2';

After I executed:
backup database plus archivelog tag="Full_Database";

I get the following files in each directory:
ls -latr /backup_oltp
-rw-r----- 1 oracle oinstall 18907136 Aug 25 2006 c-3939414311-20060825-00

ls -latr /u03/flash_recovery_area/OLTP4R/backupset/2006_08_25/
-rw-r----- 1 oracle oinstall 141458432 Aug 25 16:03 o1_mf_annnn_FULL_DATABASE_2gz0fhx4_.bkp
-rw-r----- 1 oracle oinstall 150778368 Aug 25 16:03 o1_mf_annnn_FULL_DATABASE_2gz0fhvj_.bkp
-rw-r----- 1 oracle oinstall 1238573056 Aug 25 16:04 o1_mf_nnndf_TAG20060825T160319_2gz0frkm_.bkp
-rw-r----- 1 oracle oinstall 1112940544 Aug 25 16:05 o1_mf_nnndf_TAG20060825T160319_2gz0j44n_.bkp
-rw-r----- 1 oracle oinstall 15475359744 Aug 25 16:16 o1_mf_nnndf_TAG20060825T160319_2gz0frl5_.bkp
drwxr-x--- 2 oracle oinstall 4096 Aug 25 16:16 .
-rw-r----- 1 oracle oinstall 667648 Aug 25 16:16 o1_mf_annnn_FULL_DATABASE_2gz15w4r_.bkp
-rw-r----- 1 oracle oinstall 564224 Aug 25 16:16 o1_mf_annnn_FULL_DATABASE_2gz15w58_.bkp

So here are my questions:
- Is my configuration correct? What about my RMAN parameters?
- I expected to see my backuped files on '/backup_oltp/', why they are not there?
- Can someone explain to me what are those files on each location?

Any help is appreciated