Why z/OS

IBM z/OS® is designed to keep applications and data available, systems secure, server utilization high, and development agile. It maintains compatibility for existing applications and runs Linux® on IBM Z® containers on premises and in hybrid clouds. And with the new IBM z15™ you can get even more performance, data privacy, security, and cyber resiliency.

What’s new

z/OS V2.4

With a continuous delivery model, new z/OS capabilities are available each quarter with no impact to stability, complexity or costs.

Accelerate recovery boost

Additional image-level processing capacity and parallelism for faster return to steady-state operations.

Accelerate SORT

Cut the CPU costs and improve the elapsed time for eligible sort workloads.

Scan code for security

Identify vulnerabilities and obtain information for remediation.

Accelerate hybrid cloud adoption

IBM z/OS Container Extensions

Deploy and manage nearly any Linux on Z application in a z/OS address space.

Cloud Provisioning and Management for z/OS

Provision quickly with automated self-service processes.

z/OS Cloud Broker

Deploy z/OS resources and services with cloud apps for seamless cloud DevOps.

Develop applications

Java for z/OS

Provides the Java language and function for z/OS.

Language environment

A run-time environment for C, C++, COBOL, PL/I Fortran and assembler applications.

Metal C

Generates code without language environment runtime dependencies.


IBM SDK for Node.js - z/OS helps augment existing IBM Z® application stacks.


z/OS XML System Services is used to parse documents with or without validation.

Enable security

Multi-Factor Authentication for z/OS (MFA)

Works with RACF to add authentication factors.

JES2 Spool Encryption

Enables extensive encryption and compression of JES2-managed data sets.

Resource Access Control Facility (RACF)

Helps secure data, protect vital system resources and control permissions.

IBM Z Data Privacy for Diagnostics

Safeguard data dumps and protect data from vendors.

z/OS Authorized Code Scanner

Scan authorized code for vulnerabilities and obtain information for remediation.

z/OS Certificate Authority (PKI)

Allows administrators to manage requests in accordance with policies.

Gain ease of use

z/OS Management Facility (z/OSMF)

Web-based interface helps manage z/OS systems z/OSMF. Ansible collection available on Ansible Galaxy.

z/OS Software Installation Simplification

Simplify software installation, set-up, and maintenance

z/OS Upgrade Workflows

Upgrade z/OS through z/OSMF Workflows task for a tailored upgrade path.

Manage performance

Capacity Provisioning

Automated identification and resolution of system capacity bottlenecks. 

Resource Measurement Facility (RMF)

Collects data to monitor, tune and configure the system.

z/OS Workload Interaction Correlator

Generate summaries of OS, middleware and workload component activities.

z/OS Workload Management (WLM)

Monitors the system and manages multiple workloads.

Manage systems

IBM z/OS Communications Server

Foundation for building and deploying networking applications on z/OS.

Hardware Configuration Definition (HCD)

Configures processor’s channel subsystem and OS.

Hardware Configuration Manager (HCM)

Offers a PC-based interface to HCD.

Network File System (NFS)

Brings managed storage to a distributed network.

Print Services Facility (PSF) and Infoprint Server

Helps manage production printing.

System Display and Search Facility (SDSF)

Monitors and manages a sysplex in JES2/JES3 environments.

Manage storage


Provides high-performance sort, merge, copy, analysis and reporting.


Provides storage, data and device management functions.


Provides data management services such as copying,  and space reclamation.


Provides policy based data availability and life cycle management functions.


Manages your removable media as one enterprise-wide library across systems.

IBM z/OS Cloud Storage

Simplify data archiving operations using Transparent Cloud Tiering (TCT).

Hear from customers

z/OSMF enables mainframe users to use open interfaces for applications which benefit our IT operational management. From now on, z/OSMF is a key component of our operating system rather than an independent product.

Lihui Liu, Project Manager, ICBC Data Center

Explore resources

New community

Participate to make the mainframe even more integrated and agile.

New software pricing

New enterprise consumption and capacity solutions offer flexibility and savings.


Delivers fast, personalized customer services at scale with cutting-edge IBM technology


Cuts dev costs with Z Container Pricing and empowers developers with RESTful APIs.

More case studies

See how customers in your industry are succeeding with IBM Z.


See Consolidated Service Test, Recommended Service Updates and more.


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