You can check by using following command
Expired Backup: List Expired
Then use report obsolete command, it show the backup that you dont need it and after that use Delete obsolete command,
It will delete the backup that you dont need it.
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Use command:
Rman > crosscheck backup;
Rman > crosscheck archivelog all;
Rman > list backup;
Rman > list archive logall;
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1) RMAN>crosscheck backup;
This command will give you the output for the Active and Expired Backups.
2) RMAN>report obsolete;
This command will shows you the obsolete backups.
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