Discover how a cross-system coupling facility (XCF) allows mainframe systems to communicate directly with each other in a Parallel Sysplex configuration, enabling high availability and scalability.
Table of Contents
Question
Which allows the system to communicate peer to peer
A. Sysplex timer
B. Virtual Coupling
C. Cross system coupling facility
D. Couple Datasets
Answer
C. Cross system coupling facility
Explanation
In an IBM mainframe Parallel Sysplex environment, the cross-system coupling facility provides the communication infrastructure that allows multiple z/OS systems to communicate directly with each other in a peer-to-peer manner. The XCF enables high-speed, low-latency connectivity between the coupled systems.
Here’s how the XCF enables this peer-to-peer communication:
- The XCF uses high-speed fiber optic links called coupling facility channels to interconnect the mainframe systems (known as z/OS images) in the sysplex.
- These channels allow the systems to exchange data and messages with each other through the coupling facility at very high speeds with minimal latency.
- The XCF provides a set of services and protocols that the z/OS images use to communicate. This includes functions like signaling paths, messaging services, locking services, caching services, etc.
- Applications and subsystems running on one z/OS image can directly communicate with applications and subsystems on another z/OS image via the XCF, without going through intermediate nodes or servers.
The other options mentioned – sysplex timer, virtual coupling, and couple datasets – play important roles in a Parallel Sysplex but do not directly enable peer-to-peer communication between z/OS images like the XCF does. The sysplex timer provides a common time source, virtual coupling extends the benefits of a Parallel Sysplex to systems without physical coupling facilities, and couple datasets store configuration and policy information used to manage the sysplex.
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