Secure and scalable infrastructure

The IBM® z/OS® (PDF, 480KB) operating system delivers the secure, scalable, available infrastructure required for hybrid architectures to support on premises, off premises, or provisioned as-a-service.

z/OS integrity statement (PDF, 75.6KB)                     →Announcing container pricing


Focus on a transparent and consumable approach to enable extensive encryption of data in-flight and at rest.

Hybrid cloud

Transform from an IT cost center to a value-generating service provider, delivering world-class services on-premises or off-premises.

Insights with AI

Minimize the cost and complexity of analytics by accessing your enterprise data “in-place” with minimal data duplication or data movement.


Gain 99.999% application availability and unmatched disaster recovery. Some client installations run for a decade without a second’s downtime.

The operating system

IBM z/OS V2.3

This operating system delivers innovations designed to build the highly scalable and securable next-generation infrastructure.

Featured z/OS technologies and tools

System Display and Search Facility (SDSF)

SDSF technology uses IBM z/OSMF to view and help monitor and manage your z/OS sysplex, in both JES2 and JES3 environments.

Resource Measurement Facility (RMF)

This optional feature collects data for z/OS and sysplex environments to monitor systems' performance behavior and tune and configure the system.

IBM SDK for Node.js - z/OS

Node.js can enable enterprise clients to efficiently augment existing IBM Z® application stacks to provide a timely response to customer requirements driven by digital transformation.

IBM® Multi-Factor Authentication for z/OS®

This software works with IBM Resource Access Control Facility (RACF®) to add authentication factors to z/OS systems, define policies for these factors and apply them to specific IDs.

Resource Access Control Facility (RACF)

RACF technology provides security for an installation's data and protects your vital system resources and controls what users can do on the operating system.

IBM Open Data Analytics for z/OS

This software integrates open source analytics, advanced data access and abstraction by combining open source run times and libraries with analysis of z/OS data at its source.

z/OS V2R3 runs extremely stable, robust and offers good improvements to manage our daily business e.g. in Unix System Services, JES2 and z/OSMF

—Horst Schmidt, Generali Shared Services S.c.a.r.l.

z/OS announcements

See what’s new for z/OS.

IBM Z announcements

Meet the new z14 mainframe for trusted digital experiences.

Software pricing news

See what’s new in software pricing and how it works.

Danske Bank

Speeds innovation in banking and customer services.


Gains quality and service with SAP running on the mainframe and z/OS.

Industry success

See how customers have transformed their businesses with IBM Z.

For developers

Get updates on DevOps, find trials and connect with experts.

For students

Develop IT and mainframe skills 

All training

Learn and succeed with personalized learning.

ISVs and z/OS

See the independent software vendors reporting support for z/OS.

ISVs and IBM Z

Learn about our network of service providers and 700 ISVs with over 4,000 applications.


Find popular z/OS product documentation.


Read technical materials written by technical professionals.

More resources

Find z/OS files, workflows and downloads

Find services

Learn about Consolidated Service Test (CST), Recommended Service Upgrades (RSU) and Red Alert service.

Get answers

Search on your own or email us for non-technical questions.

Find more support

Get the services and support you need.


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