Learn about the purpose of XCF (Cross-System Coupling Facility) in IBM mainframe systems and how it enables communication and coordination in a Sysplex environment.
Table of Contents
Question
XCF is used for:
A. Sysplex
B. Shutdown the system
C. IPLing the system
D. None
Answer
A. Sysplex
Explanation
XCF, which stands for Cross-System Coupling Facility, is a component of IBM’s z/OS operating system used in mainframe computing environments. Its primary purpose is to enable communication and coordination among multiple z/OS systems in a Sysplex (System Complex).
A Sysplex is a cluster of IBM mainframes that work together as a single system image, allowing for high availability, workload balancing, and resource sharing. XCF provides the essential services that make this possible by allowing systems within the Sysplex to communicate with each other, monitor each other’s status, and coordinate their activities.
Some key functions of XCF in a Sysplex environment include:
- Enabling systems to join or leave the Sysplex dynamically
- Facilitating the exchange of messages and data between systems
- Providing group services for managing collections of related systems or applications
- Monitoring the health and status of systems in the Sysplex
- Coordinating the use of shared resources, such as data sets or coupling facility structures
So in summary, the correct answer to the question “XCF is used for:” is A. Sysplex. XCF is not used for shutting down or IPLing (Initial Program Load) of individual systems, but rather for enabling the communication and coordination necessary for multiple systems to function as a Sysplex.
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