Hi,
If you take a look for metrocluster configuration guide you can see, that only one management port per ATTO is used in there.
I don't see why you couldn't configure both ports with seperate ip addresses, but if I remeber correctly, there is no trunking possibility.
There is also second SAS port you can't use with NetApp.
I think the main reason is because it's product from Atto, and it's not only for NetApp environments.
It's also cheaper to manufacture one model with two ports than two seperate models.
So far, I haven't configure any ATTOs with two management ports, maybe I use the second port, when the first breaks
Br.
Ismo.