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IBM z/VM
IBM z/VM · Armonk, New York, United States · founded 1911
What it is
IBM z/VM is a paid, self-hosted operating system and hypervisor for running guest servers on IBM Z and IBM LinuxONE systems. It can host Linux, z/OS, and z/TPF virtual machines, and IBM says one supported server can run hundreds to thousands of guest servers. Supported workloads include Linux, hybrid cloud, and containers, with nested virtualization available. z/VM 7.5 lists Host Secure Boot validation for signed host IPL code on ECKD and SCSI devices, plus Memory Overcommitment Control. Single System Image coordinates resources across z/VM systems to balance workloads and reduce planned outages. Performance Data Pump supplies real-time z/VM performance data for visualization and analysis in enterprise observability products. IBM lists Red Hat OpenShift as a supported workload and offers management add-ons. Releases run only on specified IBM Z and LinuxONE models. Linux must be obtained from a distribution partner, and optional features require separate orders and licenses.
For and against
For
- Hosts hundreds to thousands of guest servers
- Supports nested virtualization
- Coordinates resources across z/VM systems
- Provides real-time performance data
- Supports Red Hat OpenShift workloads
Against
- No free plan
- Self-hosted on IBM Z or LinuxONE
- Linux must be obtained separately
- Optional features require separate licenses
The verdict
IBM z/VM targets large-scale virtualization on IBM Z and LinuxONE, with workload, security, coordination, and monitoring features. Hardware compatibility depends on the release, while Linux and some options require separate procurement.
Who it suits
It suits organizations running virtualized Linux, z/OS, z/TPF, hybrid-cloud, or container workloads on supported IBM Z or LinuxONE hardware. Teams needing multi-system coordination and enterprise performance data may use its listed management features.
Plans and prices
IBM z/VM
Runs on supported IBM Z and IBM LinuxONE servers · optional features require separate orders and licenses
Read 8 Oct 2026 · ibm.com
On the record
- Company
- IBM's corporate address is in Armonk, New York, and IBM's history page says its predecessor C-T-R was incorporated in 1911.ibm.com · read 8 Oct 2026
- Host platforms
- IBM Z and LinuxONEibm.com · read 20 Sep 2026
- Host Secure Boot
- z/VM 7.5 can validate signed host IPL code for ECKD and SCSI devices using security keys in the HMC certificate store.ibm.com · read 8 Oct 2026
- Integrations
- IBM lists Red Hat OpenShift as a supported workload and offers add-ons for managing z/VM and Linux systems.ibm.com · read 8 Oct 2026
- Linux provisioning
- Linux is not provided with z/VM and must be obtained from a Linux distribution partner to run as a guest.ibm.com · read 8 Oct 2026
- Memory management
- IBM lists Memory Overcommitment Control among z/VM 7.5 features.ibm.com · read 8 Oct 2026
- Nested virtualization
- Yesibm.com · read 20 Sep 2026
- Optional licenses
- DirMaint, Performance Toolkit, RACF, and RSCS are included in the z/VM 7.4 system image but are installed disabled and require orders to establish licenses before enabling.ibm.com · read 8 Oct 2026
- Performance monitoring
- Performance Data Pump extracts real-time z/VM performance data for visualization and analysis in enterprise observability products.ibm.com · read 8 Oct 2026
- Platform limits
- Each z/VM release runs only on specified IBM Z and LinuxONE servers; z/VM 7.5 lists IBM z16, z17, and LinuxONE Emperor 4, Rockhopper 4, Emperor 5, and Rockhopper 5 models.ibm.com · read 8 Oct 2026
- Pricing model
- IBM describes optional sub-capacity pricing for eligible z/VM programs, which requires IBM License Metric Tool and the z/VM Hypervisor Proxy for ILMT.ibm.com · read 8 Oct 2026
- Purpose
- IBM z/VM is an operating system and hypervisor designed to run guest servers including Linux, z/OS, and z/TPF virtual machines on IBM Z and IBM LinuxONE.ibm.com · read 8 Oct 2026
- Scale
- IBM says z/VM can run hundreds to thousands of guest servers on a single IBM Z or IBM LinuxONE server.ibm.com · read 8 Oct 2026
- Security configuration
- The z/VM 7.5 default RACF configuration is set to meet Common Criteria requirements, and some environments may require new CP commands to change security settings.ibm.com · read 8 Oct 2026
- Service delivery
- IBM delivers new z/VM functions through continuous delivery during a release lifecycle.ibm.com · read 8 Oct 2026
- Systems management
- The Single System Image feature coordinates resources across z/VM systems to reduce planned outages and balance workloads.ibm.com · read 8 Oct 2026
- Workloads
- The product supports Linux, hybrid cloud, and containerized workloads.ibm.com · read 8 Oct 2026