This parameter specifies the acceptable number of corrupt data blocks during an RMAN backup, with respect to data files.
rman_maxcorrupt = (<dbf_name>|<dbf_id>:<corr_cnt>, ...)
Possible values:
<dbf_name>: data file name
<dbf_id>: data file ID
<corr_cnt>: maximum acceptable number of corrupt data blocks for the specified data file