Coupling facility structure size is defined in terms of the total storage in the coupling facility to be used. This includes both control areas required by the coupling facility control code and data areas used by the application. Determination of the size is further affected by coupling facility allocation rules and the coupling facility allocation increment size, a function of the level of coupling facility control code.

You must take all of these factors into account when determining how to define your CFRM policy and how to configure your coupling facility.