z/OS cross-system coupling facility
IBM Z Workload Scheduler uses the z/OS cross-system coupling facility (XCF) to connect IBM Z Workload Scheduler systems using XCF communication links.
When one or more trackers are connected to the controller through XCF communication links, the IBM Z Workload Scheduler systems form an XCF group. The systems use XCF group, monitoring, and signaling services to communicate. The controller submits work and control information to the trackers using XCF signaling services. The trackers use XCF services to transmit events back to the controller.
XCF connections let IBM Z Workload Scheduler support a hot standby controller and automatic-workload-restart functions.