When the coupling facility space for a log stream becomes full

This topic applies to coupling facility log streams only.

Ordinarily, system logger off-loads coupling facility resident log stream data to DASD log data sets before the coupling facility storage allocated to the log stream is fully utilized. Occasionally however, the coupling facility storage allocated to a log stream reaches 100% utilization, for reasons such as a sudden burst of logging activity or because your coupling facility is sized too small for the volume of log data.

You can monitor the number of times a log stream becomes full using SMF record 88 (field SMF88ESF).

If you want to enlarge your coupling facility structure, you can do it in one of two ways:

Alter the coupling facility size dynamically by issuing the SETXCF START,ALTER command or the IXLALTER service.
Update the CFRM policy with the new coupling facility size, activate the policy, and then have the operator initiate a rebuild of the structure.