Remove archives using RMAN

Question

Hello everyone,
We've two situations (11GR2 (11202) RAC) ...
- first, is even when using "backup as copy archivelog all not backed up 1 times" for backing up logs to normal FS from ASM I get below errors in log file:
Starting backup at 10-OCT-11
current log archived
channel ch1: starting archived log copy
input archived log thread=2 sequence=14123 RECID=44194 STAMP=764124901
channel ch2: starting archived log copy
input archived log thread=1 sequence=18793 RECID=44195 STAMP=764124901
RMAN-03009: failure of backup command on ch1 channel at 10/10/2011 02:00:23
ORA-19635: input and output file names are identical: /oracle/admin/archive_backup/RAC_2_14123.arc
continuing other job steps, job failed will not be re-run
channel ch1: starting archived log copy
input archived log thread=2 sequence=14124 RECID=44196 STAMP=764124930
RMAN-03009: failure of backup command on ch2 channel at 10/10/2011 02:00:24
ORA-19635: input and output file names are identical: /oracle/admin/archive_backup/RAC_1_18793.arc
continuing other job steps, job failed will not be re-run
Is RMAN not supposed to backup only those archives which were not already backed up ?
Or is it that copy is not counted as a backup ???
- Second, when I remove the logs using "delete archivelog all completed before "trunc(sysdate)"" it removes the logs from ASM as well as the copy made using above command.
can anybody help me with this.
thanks

Answer 1

From documentation:
Note: You can only specify NOT BACKED UP integer TIMES when backing up archived redo log files into backup sets.
RMAN does not throw an error, but it ignores the clause.
Werner