The command runs asynchronously to the JES3 address space code. Therefore, it is possible that JES3 is changing the data while the command is executing.
This can lead to an occasional program check or a loop while the command is executing. When a loop is detected, message "IAT6417 Command 'CHK ' exceeded 1 minute. Reply 'CANCEL' to stop" is issued and a response is required. In either case, enter the command again. If the error happens persistently, you can report the problem to IBM®.
The interval specification controls how frequently JES3 will check what the currently dispatched FCT is.
The threshold determines when messages IAT6397, IAT6398, IAT6415 and IAT6410 are issued for an FCT that has been continuously active for the specified number of seconds.