I was wondering if people would be interested in having a plugin that transferred user data from server to server. (I do not know if one exists..) So as soon as the user got off one server, his data would transfer the the other servers. Yes, I understand the amount of abuse that could be used in this, but it seems like if managed correctly,it could be used awesomely. Any and all opinions would be loved to be read. Thanks -Ryan AKA. Devils_Cool
As javoris767 said, you need some sort of central server or database that the other servers connect to and interact with. Most likely this would be a completely separate server due to the load that could be on it could cause lag, which would affect your game if you were running it with a minecraft server. It is possible though and has been done, take a look at how DayZ (or better for this MineZ) or another online game uses this, they contain a database for information that transfers over from one to another and allows the servers to access that information.
If all the Servers are running off a Linux OS you can make folder links to share certain folders EG one server could have the folder for "examplepermissionsplugin" but the other 2 servers would just use "/link" to that folder where their ones would be.