There may be occasions when it is necessary to alter the Parallel Sysplex® configuration — to add or modify processors, to upgrade coupling facilities, or to remove and replace hardware or software components of the configuration. This topic provides guidelines specifically for handling the configuration of coupling facility (CF) resources in a Parallel Sysplex environment. It emphasizes the relationship between the structures that may already be allocated in a CF and the CF and structure definitions in a coupling facility resource management (CFRM) policy. It is important to understand these relationships thoroughly before beginning any configuration changes for CF resources.