As far as SIOC is concerned, Its for managing contention at datastore level.
But i have heard that Oracle recommends you to not enable SIOC. Wont OFI device take care of contention? Whats the bandwidth you have from ESXi server to FI? Even if you enable SIOC, whats the uplink that you have on your storage side? 8GB? Then what about the contention there? You could use QoS on OFI instead.