When a system running in a PR/SM™ partition fails, another system in the sysplex that is running in a partition on the same processor can reset or deactivate the failed system and remove it from the sysplex without operator intervention.

The RESETTIME and DEACTTIME parameters allow you to specify how much time should elapse after the status update missing condition is detected before the action is taken.

If the reset or deactivate action against the failed system is unsuccessful, the system that initiated such action falls back to the system default of isolating the failed system immediately, as if ISOLATETIME(0) was specified.

If system isolation is possible, IBM® suggests that you use the ISOLATETIME parameter, because the RESETTIME and DEACTTIME parameters forcibly terminate I/O in-progress instead of giving time to clean up. Note that the SSUMLIMIT parameter also applies to resetting or deactivating a failed system. See Isolating a failing system.