If you have the 10GbE NICs bonded as an IFGRP or VIF or whatever they call them these days, unbond them. IFGRP plus iSCSI is a no-no. Bind both 10GbE NICs to the iSCSI service on each of the NetApp controllers individually and set them for RR multipathing over jumbo frames (enabled end-to-end) and it'll work properly. At least the pathing will.
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