Ey Luca, didn't see your message. I am with the same scenario; 2nd nic for storage with Linstor.
It is the first time I have two nic in each node and the first time to have to use Linstor. I am bit afraid with all together because it is a hot migration. Feel free to open a private message to talk about. Now you make me curious about Netapp. seems a cloud product, right?