That doesn't sound like server meshing, that just sounds like 6 servers sharing the work load for one area. Most likely a case where one server handles all AI/NPC logic, another handles trading/transactions, another handles health/damage/combat, another handles chat, etc.
Using your Dark Age of Camelot example, server meshing would be expanding the map using 2 different "gamespaces" and allowing players the ability to transition between those gamespaces seamlessly without any loading screens and without realizing that they even crossed a boundary at some point. It let's you massively expand the area in which you can travel without loading screens.