When you define a list structure, you must specify its size. (If the size you specify is too small, message IXC463I describes the minimum amount of space needed to allocate the structure.)

The size of a signaling list structure depends on the number of MVS™ systems in the sysplex, the level of the coupling facility, the level of MVS you are running, and the size, frequency, and performance requirements for the messages (signals) that the list structure is to accommodate.

IBM® recommends that you use the CFSIZER tool to calculate the size of all your coupling facility structures.