taken from TR-4182
As a best practice, NetApp recommends that when you create an IFGRP, you should create the IFGRP by
using ports from different NICs. You should, however, verify that they are the same model or chipset and that
they have the same port speed, functionality, and so on. This step is critical in maintaining consistency in the
IFGRP in the event of a port failure. By maintaining consistency with port aggregation and by spreading the
IFGRP over NICs in different PCI slots, you decrease the chances of a slot failure bringing down all the ports
in an IFGRP.