Learn about the mainframe facility that allows partitioning into LPARs. Understand how PR/SM enables virtualization and resource sharing on IBM z Systems mainframes.
Table of Contents
Question
What is the facility that allows mainframes to be partitioned into LPARs?
A. Z/os
B. PR/sm
C. Vitual storage
D. Coupling facility
Answer
B. PR/sm
Explanation
The facility that allows mainframes to be partitioned into LPARs (Logical Partitions) is PR/SM, which stands for Processor Resource/Systems Manager.
PR/SM is a hardware partitioning feature built into the firmware of IBM z Systems mainframes. It creates and manages LPARs, allowing a single physical mainframe to be divided into multiple logical partitions, each running its own operating system instance.
Key points about PR/SM:
- Enables secure partitioning of system resources (processors, memory, I/O)
- Allows LPARs to run independently, as if they were separate physical machines
- Provides flexible allocation of resources to LPARs based on workload needs
- Supports advanced capabilities like processor sharing and dynamic resource allocation
- Managed through the Hardware Management Console (HMC)
In summary, PR/SM is the underlying hypervisor technology that provides the foundation for mainframe virtualization and LPAR functionality on IBM z Systems. It offers robust partitioning, resource sharing, and management capabilities to maximize utilization and flexibility of mainframe hardware.
The other options given are incorrect:
- z/OS is the primary operating system for IBM Z mainframes
- Virtual storage refers to memory virtualization techniques
- Coupling facility is a specialized LPAR for data sharing in a Parallel Sysplex
So in this question, PR/SM is the facility that specifically allows mainframes to be partitioned into multiple LPARs.
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