Performance Benefits of Asynchronous Duplexing

IBM introduced Asynchronous duplexing for the Db2 Coupling Facility (CF) lock structure back in 2016. It took some time for sites to get positioned with the combination of software (z/OS 2.2, Db2 V12) and hardware (z13 CFs) prerequisites. And considering the business-critical role the Db2 lock structure plays in Db2 data sharing environments, it was understandable that many users have taken a cautious approach to implementing a change of this magnitude.

In this Cheryl Watson Tuning Letter Reprint, Todd Havekost and Frank Kyne detail their experience after analyzing the detailed performance data from another client that implemented Asynchronous duplexing.

This article covers the tremendous performance benefits they experienced (including some that were entirely unanticipated by all involved), and is of interest to anyone still contemplating Asynchronous duplexing, as well as for those who want to better understand coupling facility performance.


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This document is reprinted with permission from Watson and Walker. It originally appeared in Cheryl Watson’s Tuning Letter 2021 No. 2.

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