Thank you for the reply.

I have tested many ways in a "json config file" but still can not work as executing 'rpc.py log_set_flag nvme' when starting the SPDK app with '-c' option and specify the json config file.

That's why I'm here asking for an example of "json config file".

Does anybody know the answers? Or currently SPDK does not support "log_set_flag" in a json config file?

Thanks