Parallel Sysplex

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Schematic representation of a Geographically Dispersed Parallel Sysplex (GDPS). A GDPS is a parallel Sysplex version in which hardware components and connections are designed redundantly and distributed over several locations.

The Sysplex ( Sys tem processing com plex ) is a to 1990 by IBM introduced loose computer link (loosely coupled) of IBM mainframes . This simple form of the cluster is often also called Base Sysplex or Basic Sysplex.

The Parallel Sysplex is a further development of the Sysplex, which was introduced in 1994 . This is a closely coupled computer link . The Coupling Facility (CF) takes on the function of a global working memory, within which three different structure types can be generated. These are lock, list and cache structures that may a. can be used to manage competitive situations when accessing shared resources. The Coupling Facility is an LPAR or an ordinary IBM mainframe on which the Coupling Facility Control Code (CFCC) is executed.

If subsystems such as CICS , DB2 or IMS use the technologies provided by the Parallel Sysplex, they can present themselves to the user as a single application, which is also referred to as a single system image (SSI).

With consistent implementation, the system and subsystem side u. a. Advantages in

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