Coupling Facility Levels and Exploiting Software Levels
The CFCC code is released as "Levels", usually denoted by their "CFLEVEL". For example, CFLEVEL 15 was announced in April 2007. Each level brings new function and sometimes improved performance. In most cases the new function or performance improvement requires a corequisite release of z/OS and perhaps new function in some subsystem (such as DB2). One such example is Coupling Facility Structure Duplexing. (Sometimes support from the operating system and subsystems is available via PTFs rather than a full release.)
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