Service levels establish priority among tasks that are waiting to be dispatched.
When the Load Balancer has more Session and Command tasks to dispatch than the PowerCenter Integration Service can run at the time, the Load Balancer places the tasks in the dispatch queue. When nodes become available, the Load Balancer dispatches tasks from the queue. The Load Balancer uses service levels to determine the order in which to dispatch tasks from the queue.
You create and edit service levels in the domain properties in the Administrator tool. You assign service levels to workflows in the workflow properties in the PowerCenter Workflow Manager.