Oracle Error Message
RMAN-06481: WARNING: backup piece ‘string’ cannot be found on the storage medium
Reason for the Error
The CHANGE BACKUPPIECE AVAILABLE command was used, but the backup piece cannot be found on the storage medium.
Solution
If the storage containing the backup piece has been removed from the host, restore it and retry the command. If the backup piece is permanently gone, then issue the CHANGE BACKUPPIECE DELETE command for this backup piece.