Hi Arshad,
you have to do a standard system copy Export/Import only if you want to change the o.s. of the server where database is installed. In my example, after DMO migration, the database is HANA with Linux and the application server is Windows (the source one).
Now my goal is to change the o.s. of the application server that doesn't require a system copy (database is not moved). I can install a new primary application server (called "primary" but is a normal application server) in a linux server and turn off the source windows AS.
What do you think about it? I think this is the right procedure to change a o.s. of AS.
Regards,
Walter