CICS topology
You can distribute CICS® applications and the resources they use between interconnected CICS regions. You can group CICS regions into CICS system groups and CICSplexes, and distribute regions across the z/OS® systems in a sysplex.
The following terms are used when discussing CICS topology:
- Sysplex
A set of z/OS systems that communicate and cooperate with each other through multisystem hardware components and software services.
- CICS region
An named instance of CICS Transaction Server that runs in its own z/OS address space. A CICS region can be started and stopped independently of other CICS regions.
A CICS region can be part of a CICSplex or a single CICS region that is not part of any CICSplex.
- CICSplex
- A grouping of CICS regions that is managed as a single entity. Each CICS region can belong to one CICSplex only. A CICSplex can include CICS regions running on different z/OS systems in a sysplex.
- CICS system group
- A grouping of CICS regions in a CICSplex that can be managed as a single entity. A system group can include CICS regions running on different z/OS systems. In a CICSplex, each CICS region can belong to more than one system group, and system groups can be contained in other system groups.