When the coupling facility survives the sysplex failure, each system in the sysplex does the following:

1. Gets re-IPLed.
2. Identifies and reconnects to all the log streams to which it was connected before the failure occurs.
3. Performs recovery for the log streams (from the prior connections), which consists of offloading coupling facility log data to DASD log data sets or ensuring a duplex-mode structure is still intact.
4. Disconnects from the log streams that it reconnected to for recovery processing.
5. Performs recovery for any other log streams that were connected to the same coupling facility structures that the IPLing system had connections to before the failure.

Note that each IPLing system will perform recovery for log streams that it has a peer connection to, for as long as there is recovery to be done. Subsequent peer connectors IPLing will not duplicate recovery performed by other peer connectors.

Because system-level recovery for system logger is performed using the existing Coupling Facility structure information, you are using the correct LOGR couple data set when the systems are re-IPLed. See LOGR couple data set use considerations for guidance on identifying and using an existing LOGR couple data set for use by the sysplex. Consider any environments that force the structure connections or allocations when you need to issue requests for a LOGR couple data set that makes use of structures that are connected to the system.