Abstract: Asynchronous CF Lock Duplexing is a new enhancement to IBM’s parallel sysplex technology that was made generally available in October 2016. It is an alternative to the synchronous system managed duplexing of coupling facility (CF) lock structures that has been available for many years. The new Asynchronous CF Lock Duplexing feature was designed to be a viable alternative to synchronous system managed duplexing. The goal was to provide the benefits of lock duplexing without the high performance penalty. It eliminates the synchronous mirroring between the CFs to keep the primary and secondary structures in sync.
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