Logging flow overview

Log entries that must be merged are written to the same log stream. The logging flow is as follows:

1. Each subsystem (CICS®, SMSVSAM, or RRS) sends log entries to the system logger, IXGLOGR.
2. The system logger writes log entries, not only to log streams in the coupling facility, but also to the local buffer in the IXGLOGR data space.
3. If you set up DASD staging data sets (optional), the system logger also writes log entries to the DASD staging data sets.
4. If the utilization reaches the HIOFFLOAD value set in your LOGR policy, the system logger moves the log entries to DASD log data sets. This process is called offloading.
5. If a DASD log data set becomes full, the system logger allocates a new one.
6. When offloading is complete, the system logger deletes the offloaded log entries from the coupling facility, from the local buffers in the IXGLOGR data space, and from the DASD staging data sets.