I don´t know where to find all hidden params and their explanation for GoldenGate like this one "_NOIGNOREORPHANLMN".
I would like also to show a possible solution when you want to include the param TRANLOGOPTIONS ALTARCHIVELOGDEST but the log doesn´t reside on ASM. There is a hidden param: tranlogoptions _NOODIRECT <route to log> to solve this.
Internal parameters usually denoted with an _ before the name. They should only be used when support instructs you to use them.
_NOODIRECT prevents the O_DIRECT flag from being used in the open() system call on Linux when opening online and archived logs. The use of the O_DIRECT flag generally requires reading into a buffer aligned on a 512 byte boundary;
It's primarily for Linux, but may also work on AIX.