IBM z/OS is an operating system for IBM zSystems mainframes, suitable for continuous, high-volume operation with high security and stability.

Mainframe operating systems are designed to manage the complex internal workings of enterprise computing, including memory, processors, devices, and file systems. IBM Z® operating systems …

In 2025, IBM is building upon this strong foundation with z/OS 3.2, the next release of the IBM flagship mainframe operating system, designed to unlock the value of the new IBM z17.

Welcome. New to z/OS? You've come to the right place! The z/OS basic skills information center is the fastest way to learn and become productive on z/OS. Once you've learned the basic z/OS concepts …

IBM i is a fully integrated operating system, meaning the database, middleware, security, runtime, and hypervisor are all integrated into the stack and licensed as one. This integration helps clients lower …

IBM Z® mainframe software delivers programs, applications and operating systems tailored for IBM Z systems. With hybrid cloud, AI, resiliency and security, it helps organizations modernize IT with the …

IBM Z® is a family of modern infrastructure powered by the IBM Telum® processor that runs enterprise operating systems and IBM Z software delivering greater AI accuracy, productivity and agility.

What are the various OS options for Z? IBM zSystems runs operating systems including z/OS, z/VM, z/VSE, z/TPF, and Linux. In fact, it is common for multiple operating systems to run on a single …

Apr 3, 2025 · Read an overview of z/VM, IBM System z Virtualization Technology with links to technical descriptions and resources, such as z/VM general information manuals and reference guides.

An operating system (OS) is a collection of software that manages a computer’s hardware and applications by allocating resources.