Learn about the critical role coupling facilities play in enabling high availability, workload balancing, and data sharing between mainframe LPARs in an IBM Parallel Sysplex environment.
Table of Contents
Question
Coupling facility is available in
A. Standard Sysplex
B. Parallel Sysplex
C. Sysplex timers
D. LPAR
Answer
B. Parallel Sysplex
Explanation
A coupling facility is a specialized logical partition (LPAR) that runs on IBM mainframe servers like the IBM Z series. Its purpose is to enable high-speed communication and data sharing between the LPARs in a Parallel Sysplex.
Key characteristics of coupling facilities:
- Provide high-speed connectivity between z/OS LPARs in a sysplex
- Allow multiple LPARs to access and update shared data with full read/write integrity
- Enable workload balancing of shared resources across the sysplex
- Maintain global resource serialization to prevent data corruption
- Recover failed LPARs quickly for continuous availability
A coupling facility contains processors and memory but no I/O devices. It runs the Coupling Facility Control Code (CFCC) licensed internal code rather than z/OS.
Multiple coupling facilities can be configured for redundancy. If one fails, another can take over its workload to maintain full sysplex operation.
In summary, coupling facilities are an essential component that enables the high availability, scalability, and data integrity features of a Parallel Sysplex. They are not used in the other options listed (Standard Sysplex, Sysplex Timers, LPAR).
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