We are using Oracle EBS 12.2.4. Is it possible that I start EBS services on patch node perform all testing activities on patch node. At the same time when Production users are accessing application on RUN file system.
You need to stop services from RUN file system then only you can start Services form patch file system.
X A H E E R
as of now it is not possible to run application services from both RUN/PATCH file system.
No, this is currently not supported.
You cannot access the application from both file systems at the same time.
If you want to perform testing, clone production and perform the patching/testing on the target environment.