A method begins by a dispersed storage (DS) processing module selecting two or more correlated error messages of a plurality of error messages. The method continues with the DS processing module identifying two or more collection of records corresponding to the selected two or more correlated error messages such that a collection of records includes an event record including information regarding an event, a first record including information regarding a dispersed storage (DS) processing module processing an event request to produce a plurality of sub-event requests, and a plurality of records including information regarding a plurality of DS units processing the plurality of sub-event requests. The method continues with the DS processing module identifying a correlation cause of one or more errors corresponding to the two or more correlated error messages based on the two or more collections of records.