we use 3 WLC4404. Two of them on location A (130 APs), the third on location B (40 APs). Both locations are connected via 10GE-MAN, and 10km away. Now one could say I could put the controllers of location A and location B into two different mobility groups. But if one WLC fails on Location A, one third of Location A APs connect to WLC on Location B. As result two thirds of Location A APs would be in another mobility group than the last third.
So, can I use different Mobility groups only, when a location has enough WLC-capacity to support all APs on that location?
And what about RF groups? Does this matter apply there too? I am currently unsure if I should let all three controllers run with all the same Mobility and RF group.