Single-CSI structure

You can define the CSI structure to have one CSI that keeps track of all your system activity. The single-CSI data set has one global zone and one or more target and distribution zones. These are some reasons for having a single-CSI data set:

The single-CSI data set optimizes the use of direct access storage.
The single-CSI data set puts your whole establishment in one VSAM data set. This provides you with a single control point and one source of information for your whole system.

Single-CSI systems do have a drawback. When SMP/E needs to process a zone, it cannot request access to that specific zone; it must request access to the CSI data set containing that zone. As a result, if you have a single-CSI system, you can run only one background SMP/E job at a time.

Figure 1 shows a single-CSI data set structure.

Figure 1. A single-CSI structure