Oracle Database Discussions

Hi, I have a 2 node rac cluster running on linux Itanium and we currently have one physical standby server configured and we did not use the data guard broker. I want to stop sending redo data to the standby and I am a little confused with some of the documentation that I am reading? The parameter log_archive_config says it is dynamic so I was under the impression that I could make this change while the dabase is online but some of the documentation that I was reading regarding standby configurations said that you should bring both instances down when changing this?
I want to set log_archive_config= nodg_config.
Apologies for the simple question and I know your probably asking why don't you try this on your test system. Well unfortunately we dont have the resources for the standby on our test env right now... Lucky me...
Thanks to anyone that has any input on the matter.