Hello,
If cf is licensed, configured and all cablings is done correctly, then yes.
>cf status
and
>cf monitor
commands will show you, if cf is enabled and takeover possible.
You can disable and enable cf simply typing command >cf enable or >cf disable.
If controller1 crashes, controller2 will take all services from controller1.
In that case if you log in to controller2 using CLI, you are able to see all controller1 aggregates volumes etc.
Ismo