The distributed model
The distributed model is a peer-to-peer system. Each participating CICS® region can be both a routing region and a target region. A routing program runs in each region.
Figure 1 shows a distributed routing model. Four CICS regions are
connected to each other. A distributed routing program runs in each region. Each region may be a
requesting region, routing region, or target region.
The distributed model applies to the routing of the following:
- CICS business transaction services processes and activities
- Non-terminal-related START requests
- CICS web service requests
Advantage of the distributed model
There is no single point-of-failure.
Disadvantages of the distributed model
- Compared to the hub model, there are a great many inter-region connections to maintain.
- You may have problems with distributed data. For example, any data used to make routing decisions must be available to all the regions. (CICSPlex® SM solves this problem by using dataspaces.)