Both FSN and LACP provide port level redundancy. However, LACP has load balancing in addition. You can refer to VNXe High Availablitiy document for more examples. White Paper: VNXe High Availability VNXe3100, VNXe3150, and VNXe3300 Overview  Yes, in the above example, all three are in same SP.  Subnet I think come in upper layer which switches dont care. If you are thinking about vLAN, they should be configured allow multiple vLAN traffic if SPA and SPB are in different vLAN.  Even if both SPs are in put in differnet subnets, network connectivity should be configured such that, if IP addresses (CIFS/NFS/iSCSI server IP address)  on one SP fails over to peer SP, hosts/users should be able to connect to it.
Hi,  We have a new VNXe 3150 with  2X1 GB I/O modules.  Going to connect  4 physical severs (for CIFS) to storage through switch.  FCN will provide port level redundancy and LACP will allow multiple ports into single logical port and will provide load balance across linked ports and redundant ports.    My quire is can which one I can configure here either FSN / LACP ??  Thanks in advance.
Quire on FSN & LCAP