The operations log

The operations log (OPERLOG) is an MVS™ system logger application that records and merges the hardcopy message set from each system in a sysplex that activates OPERLOG. Use OPERLOG as your hardcopy medium when you need a permanent log about operating conditions and maintenance for all systems in a sysplex.

For more information on OPERLOG, see z/OS MVS Setting Up a Sysplex.