VNX5200 and CAVA

hi,

i'm trying to plan to setup CAVA on our VNX5200.

Do we need a license to use CAVA ?

If we need a license who can i check if we have it ?

Having server_2 and server_3 in active/standby configuration i have to setup

the global cifs server only on server_2 (where i have my VDM to protect) ?

CAVA can influence VDM remote replica ?

thanks

Maurizio