Oracle Error Message
RMAN-06479: WARNING: control file copy ‘string’ cannot be found on disk
Reason for the Error
The CHANGE CONTROLFILECOPY AVAILABLE command was used, but the control file copy cannot be found on disk.
Solution
If the storage containing the control file copy has been removed from the host, restore it and retry the command. If the control file copy is permanently gone, then issue the CHANGE CONTROLFILECOPY DELETE command for this control file.