Evaluating Current Connectivity Status

The system determines whether the new structure will have equivalent or better connectivity than the old structure by evaluating the current connectivity of both. For both the old structure and the new structure, the system calculates the aggregate SFM system weight of all systems that:

Have connectivity to the coupling facility in which the structure resides, and
Have one or more active connectors to the old structure.

If the system determines that connectivity to the new structure will be better (for a rebuild reason of loss of connectivity) or equivalent or better (for any other rebuild-initiation reason), the rebuild is allowed to proceed. Those systems that have connectivity to the new coupling facility and have one or more active connectors to the old structure will participate in the rebuild. For those systems that might have had connectivity to the old structure in the original coupling facility but do not have connectivity to the new coupling facility, the IXLCONN REBUILD request will fail.

If the system calculates that connectivity to the new structure will be poorer than to the original structure, then the LESSCONNACTION parameter is used. Note that if the reason for the rebuild is a loss of connectivity, the system ignores the LESSCONNACTION specification and stops the rebuild.