This information applies to coupling facility log streams only; for DASD-only log streams, see Recovery performed for DASD-only log streams.
When a system fails, system logger tries to safeguard all the coupling facility log data for the failed system by offloading it to DASD log data sets so that it is on a persistent media.
Recovery processing for the failing system is done by a peer connector, which is another system in the sysplex with a connection to a coupling facility structure that the failing system was also connected to. Note that a peer connector need only be connected to the same coupling facility structure, not the same log stream. See the chapter on planning for system logger functions in z/OS MVS Setting Up a Sysplex for more information.
When all the systems in a sysplex fail, there are no peer connectors to perform the recovery processing for the failing systems, which would consist of offloading the coupling facility data for log streams to DASD log data sets. Coupling facility resident log data continues to exist. Further recovery processing depends on whether or not the coupling facility also failed.