IBM z15
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IBM z15 server

Deliver security, privacy and resiliency at scale as part of your enterprise-wide cloud infrastructure. The IBM z15® enables cloud-native services while extending the value of data and applications. So you can drive to market faster, while avoiding cloud security risks and complex migration challenges.

The IBM z15 introduced Instant Recovery technologies to IBM zSystems. It is superseded by the IBM z16™.


Hybrid cloud automation

Learn about how digital transformation requires agility and flexibility of the public cloud while integrating with critical systems of record on-premises.

Featured resources

Read the Secure Hybrid Cloud for Dummies eBook

Browse the IBM Z and Cloud Modernization Resource Center

Benefits Cloud native

Build digital and AI-infused services that are developed — and deployed — anywhere in your cloud.

Encryption everywhere

Protect your data and applications, and manage privacy by policy, across your ecosystem.

Cyber resilience

Isolate workloads at scale, protect against attacks, deliver continuous service, and mitigate downtime.

Flexible compute

Get a z15 system for any business size, available through public, private or hybrid cloud.

Modernize applications

Make app modernization a snap so your business stays up to date.

Features A cloud native experience for developers

Get greater flexibility, portability and consistency when developing and deploying new digital and AI-infused services.

Watch the video (02:30)
Mission-critical pervasive encryption

Enable extensive encryption of data in-flight and at-rest to substantially simplify encryption and reduce costs.

Explore pervasive encryption
Ultimate uptime with Instant Recovery

Unlock system capacity to deliver faster recovery, reducing points of failure and building a 24x7x365 operation.

Watch the video (02:17)
Flexible compute for any business

IBM Z is trusted by businesses of all sizes, and IBM z15 can make resources available on demand and speed up execution time for various workloads.

Watch the video (01:45)
Isolate workloads

IBM Secure Execution enables isolation of workloads with granularity and scale to ensure protection of end-to-end services.

Explore IBM Secure Execution
Product comparison

Choose from two IBM z15 configurations.

Product specifications

IBM z15 T01 multi frame

Read the data sheet

IBM z15 T02 single frame

Read the data sheet

Maximum numbers of engines



Maximum numbers of drawers



Maximum numbers of IO drawers



Numbers of frames

1 to 4


Co-locate with storage/switch




5.2 GHz

4.6 GHz

Maximum memory

40 TB

16 TB


34, 71, 108, 145 and 190

4, 13, 21, 31 and 65

Specifications sheets

More specifications More specifications

Interactive tour

3D product tour 3D product tour

Technical guides

Technical guide Technical guide

Protect your IBM zSystems investment with support and services to keep your system running optimally.

Protect your investment (PDF)

See our flexible model for simpler, more economical IBM zSystems pricing.

Explore Tailored Fit Pricing

Product reviews
Resources IBM z15 Configuration Setup

Understand how to install, configure and maintain the IBM z15 (machine types 8561 and 8562) systems.

IBM zSystems Functional Matrix

Quickly understand the features, functions and connectivity options that are available with the IBM z16m, IBM z15 and IBM z14.

IBM z15 FAQs

Explore answers to the frequently asked questions about IBM z15.

Upgrade and save

See how you can achieve up to 30% savings by upgrading to IBM z15.

IBM Z and Cloud Modernization Center

Accelerate transformation in your IBM Z environment with expert resources, guidance and capabilities.

Instant recovery

Get up and running faster during planned maintenance or unplanned downtime.

Related products IBM z16

Accelerate decision velocity, protect against threats across your business and modernize for hybrid cloud.

IBM LinuxONE 4

Reduce your energy costs and carbon footprint while increasing performance, data protection and customer satisfaction.

IBM Z and Cloud Modernization Stack

Accelerate application modernization and take a standardized approach to IT automation on IBM zSystems technology.


The fastest, most reliable and secure storage systems for IBM zSystems and IBM Power® systems.

IBM z Integrated Information Processor (zIIP)

Cost-effectively include new technologies such as Java and Python in your application portfolio using zIIPs.

IBM Application Discovery and Delivery Intelligence (ADDI)

Accelerate your digital transformation with application insights that increase productivity and reduce risk.

Take the next step

Discover how IBM z15 brings security, privacy and resiliency to your hybrid cloud.

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