Automatic changes to structure sizes

z/OS® can automatically alter a coupling facility structure when the structure reaches an installation-defined or default percent-full threshold, as determined by structure full monitoring.

The alter process can change the size of the structure, reapportion the objects within the structure, or both. This function works the same in data sharing environments as it does in non-data sharing environments. See Adding MVS systems to a sysplex for complete information about allowing structures to be altered automatically.