1. A method for collecting performance data, comprising: identifying criteria for membership in a criteria group for which performance data is to be collected; determining member objects of the criteria group according to the criteria; selectively collecting performance data corresponding to the member objects of the criteria group in accordance with a value of an indicator associated with the criteria group; automatically causing an update in membership of the criteria group in response to an I/O data path having changed from a previous iteration, the update being based on changes in discovered I/O path elements by automatically detecting, while selectively collecting performance data, changes in discovered connections and objects used in each discovered I/O path; and displaying the discovered I/O paths and corresponding performance data associated with each of the discovered I/O paths.