A separate Management network (separate VLAN) is a viable option although a bit more complex compared to the normal practice of having just one and use NIC teaming for redundancy. If you would like to go for this approach, ensure both managemement vmkernels are on a different physical networks (connected to different switches). Another thing to consider is adding an additional isolation address (das.isolationaddress) for each additional management network. Hope it helps.
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