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IBM CICS and the Coupling Facility: Beyond the Basics by Kellie Mathis, Rich Jackson, Randy Frerking, Arndt Eade

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VSAM record-level sharing
Record-level sharing (RLS) is a Virtual Storage Access Method (VSAM) function that was first provided by DFSMS z/OS V1.3 and that is used by IBM CICS Transaction Server (CICS TS) for z/OS V1.1 and higher. VSAM data sets are opened in RLS mode, which allows them to be shared (with full update capability) among applications that are running in multiple CICS regions within a sysplex.
In Data Facility Storage Management Subsystem (DFSMS) z/OS V1.3, support was implemented for a new data sharing subsystem, SMSVSAM, which runs ...

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