SMB Client Error

It's a bad idea to mix iSCSI and LACP. Try to un-team your connections and use MPIO where you do trunking so far.

I agree with the previous speaker, MPIO is your best bet if you are considering the performance first. As for the configuration in general, I think you can make it less complicated, more reliable and what most importantly, more performant going with local storage of your nodes instead of physical SAN box. Take starwind free and let it synchronize the data across the nodes which should give you a decent performance increase since your clients would have the shortest way to storage (data locality - low latency).