When the coupling facility fails at the same time as the sysplex, each system in the sysplex does the following:

1. Gets re-IPLed.
2. Identifies all the log streams to which it was connected before the failure occurred.
3. Performs recovery for log streams by trying to recover log data from staging data sets:
   • If each connector to a log stream was using staging data sets at the time of the failure, system logger recreates the log stream data from the staging data sets for each connection. If the recovery from staging data sets is successful, the log stream is considered recovered.

     If system logger encounters an error while trying to recover log data from staging data sets, the log stream is marked as damaged. Subsequent IPLing systems will not attempt recovery from staging data sets because the log stream has been marked as damaged.

   • If one or more connectors to a log stream did not use staging data sets while trying to recover log data from staging data sets, the log stream is marked as damaged.

   Note that each IPLing system will perform recovery for the 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.