Coupling Facility Structures
A CF is used for three purposes:
- Locking information that is shared among all attached systems
- Cache information (such as for a data base) that is shared among all attached systems (or maintaining coherency between local buffer pools in each system).
- Data list information that is shared among all attached systems
These three purposes are catered for by three types of structure:
- Lock
- Cache
- List (and the variant Serialised List)
A structure is a dedicated portion of CF memory. It is said to be connected to by specific CF-exploiting applications on the coupled z/OS systems. A typical Parallel Sysplex contains several structures of each type. Each software exploiter may use several structures of each type. For example each DB2 Data Sharing Group uses one Lock structure, one List structure and several cache structures (one for each Group Buffer Pool (GBP)).
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