The evolution of CICS/ESA in the sysplex environment

The IBM CICS/ESA® transaction processing subsystem has been enhanced in a way that enables transparent exploitation of Parallel Sysplex™ technology, even by existing largescale applications. This paper describes how CICS/ESA takes advantage of and integrates new Multiple Virtual Storage (MVS) features to provide an external view of the sysplex as a single entity with workload-sensitive routing algorithms for passing work requests between nodes of the sysplex. Sysplex-wide access is provided to application scratch-pad data, to security data, and to database and file data with complete integrity.