Each individual network link is a path to the LUN. You can't aggregate them and then try to multipath over them. Break the IFGRP and bind each interface to iSCSI individually. I had a 2240-4 in a previous job and we were getting ~2800 IOPS on the random 8k test with 16 1TB SATA in an aggregate when configured properly (binding 2 of the interfaces to the iSCSI service with no IFGRP).
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