在不同的WCF实例上共享数据状态

I have two servers(and could be more later) with a WCF service, both behind a load balancer. The client application, in multiple IS servers(also loadbalanced), call the WCF to do some action, lets say a Save. The same data, lets say Client information, could be opened by several users at same time. The Save action can be, then, be executed from several users at the same time, and the call will go to different WCF servers.I have two servers(and could be more later) wit