Parameter 'LOG_FILE_NAME_CONVERT' definition is:
Specify the location of the primary database online redo log files
followed by the standby location. This parameter converts the path
names of the primary database log files to the path names on the
standby database. If the standby database is on the same system as the
primary database or if the directory structure where the log files are
located on the standby system is different from the primary system,
then this parameter is required. Multiple pairs of paths may be
specified by this parameter.
As I understand, if the redo log file directory and file name on
physical site are the same as on primary site, I don't have to assign
any value to this parameter.
For example, if '/redo/redo1.log' is one of the redo log files on
primary, at the time I create physical db, I just have to create this
redo log file as '/redo/redo1.log' on physical site.