The system logger writes log data to log streams in a coupling facility and to its data space. When the utilization of a log stream reaches the value of HIGHOFFLOAD that you have defined in your LOGR policy, the system logger will move the log data to disk data sets and delete the log data from the log stream. These data sets, called DASD log data sets, are allocated by the system logger as VSAM linear data sets and should be managed by SMS.

The recommended value for HIGHOFFLOAD is 85 percent for the primary system log.