It depends on the throughput needed and also what can be pushed on the 8020... For most cases I would run all over 10Gb... requires separate LIFs and since already running VLANs you are separating traffic. Create a separate broadcast domain (same IPspace is fine) for each VLAN, turn off ip fastpath, disable flowcontrol...I also like separate SVMs for each protocol too SAN and NAS...not required but separate them since you can.