How to change a terraria server world size

To change your world size, you will need to create a new world since the one that has been generated used the default size (small).
Follow these instructions :

1. Stop your server
2. Go in /saves/Worlds folders
3. Delete the server world files (world.wld and world.wld.bak files)
4. Change the size in the "settings" page
5. Go back to the manage page and click "restart"

Warning : Medium world size and above will require at least 2gb of ram to start properly.