A determination is made as to whether one of a system definition file data set and a catalog data set is unavailable for orderly restart of an information system. The system definition file data set provides resource definition information for the information system and the catalog data set provides resource state information for the information system. A determination is made that the other of the system definition file data set and the catalog data set is available. The unavailable one of the system definition file data set and the catalog data set is reconstructed by rebuilding the system resource definition and state information used by the unavailable one of the system definition file data set and the catalog data set using system resource information within the other available one of the system definition file data set and the catalog data set.