This message indicates the capacity of the list structure with respect to signalling. Use this information as part of capacity planning activities, when evaluating structure size in the CFRM policy, or when determining potential causes of signalling performance degradation, or signalling connectivity problems.

The system initially tries to allocate the list structure with enough lists to provide for full signalling connectivity among all the potential systems in the sysplex. The number of potential systems is determined by the maximum number of systems supported by the sysplex couple data set. If numsys is smaller than the maximum number of supported systems, systems may not be able to establish signalling paths due to an insufficient number of lists within the structure. This condition may also indicate that the structure is too small, which can degrade signalling performance. Signalling performance is degraded if the number of signals (list entries) is too small.