Improving the reliability in the SLC control system

During the past year, considerable emphasis has been placed on improving the overall reliability of the Stanford Linear Collider (SLC) control system. The Errorlog Facility has proven to be a useful tool to diagnose hardware and software problems. By analyzing the various error messages and their correlations, one can usually determine the software component or hardware module causing faults. Daily summaries help to identify problems so that they can be remedied before they become catastrophic, thereby bringing about a considerable increase in performance. We discuss the various tools that we use and our operational experience with them. (orig.)