The system overview tool of the Joint COntrols Project (JCOP) framework

For each control system of the Large Hadron Collider (LHC) experiments, there will be many processes spread over many computers. All together, they will form a distributed system with around 150 computers organized in a hierarchical fashion. A centralized tool has been developed for supervising, identification of errors and troubleshooting such a large system. A quick response to abnormal situations will be crucial to maximize the physics usage. This tool gathers data from all the systems via several paths (e.g., process monitors, internal database), and after some processing, presents it in different views. Correlations between the different views are provided to help to understand complex problems that involve more than one system. It is also possible to filter the information presented to the shift operator according to several criteria (e.g. node, process type, process state). Alarms are raised when undesired situations are found. The data gathered is stored in the historical archive for further analysis.