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The error is a OS error, it means it cannot create a file (no free space, no permissions, no tape...) anyway this means the problem is not located on Oracle (sys or system) is the user of operative system.
Check the permissions where you want to write, a quick way to test this is to use the chmos 777 ;) Anyway BECAREFULL 777 means everybody can do anything, after checking if this is the problem turn the chmod 700 or 770 again ;)
When you have given a backup format , you have given a directory name as part of it.
RMAN can not create a directory at all.Keep everything ready for RMAN to create a backup file.
Thanks for the replies.
The directory /rcat/backups/train does exist and an ls command gives that everyone can write to the directory.
(listing of ls)
drwxr-xr-x 2 oracle dba 96 Aug 29 15:28 train