Adabas Parallel Services and Adabas Cluster Services

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# Adabas Parallel Services and Adabas Cluster Services

Adabas Parallel Services is very similar to another Adabas add-on product, Adabas Cluster Services. As shown in the following table, the differences between the two are the mechanisms used for inter-nucleus communication and for maintaining and accessing the shared cache and lock data:

Service | Adabas Parallel Services | Adabas Cluster Services
--- | --- | ---
Architecture | all nuclei on same system image | nuclei on different system images in parallel sysplex
Communication (inter-nucleus) | via inter-process communication (ADALNK) | via cross-system coupling (XCF) services
Cache | in shared data space or 64-bit addressable virtual storage | in coupling facility
Lock | in shared data space | in coupling facility