IBM z15 (8561) Technical Guide

An IBM Redbooks publication

Published 17 January 2020, updated 13 July 2022

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ISBN-10: 0738458120
ISBN-13: 9780738458120
IBM Form #: SG24-8851-00
(513 pages)

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Authors: Octavian Lascu, John Troy, Jannie Houlbjerg, Frank Packheiser, Paul Schouten, Kazuhiro Nakajima, Anna Shugol, Hervey Kamga, Bo XU


This IBM® Redbooks® publication describes the features and functions the latest member of the IBM Z® platform, the IBM z15™ (machine type 8561). It includes information about the IBM z15 processor design, I/O innovations, security features, and supported operating systems.

The z15 is a state-of-the-art data and transaction system that delivers advanced capabilities, which are vital to any digital transformation. The z15 is designed for enhanced modularity, which is in an industry standard footprint.

This system excels at the following tasks:

  • Making use of multicloud integration services
  • Securing data with pervasive encryption
  • Accelerating digital transformation with agile service delivery
  • Transforming a transactional platform into a data powerhouse
  • Getting more out of the platform with IT Operational Analytics
  • Accelerating digital transformation with agile service delivery
  • Revolutionizing business processes
  • Blending open source and Z technologies

This book explains how this system uses new innovations and traditional Z strengths to satisfy growing demand for cloud, analytics, and open source technologies. With the z15 as the base, applications can run in a trusted, reliable, and secure environment that improves operations and lessens business risk.

Table of contents

Chapter 1. Introduction
Chapter 2. Central processor complex hardware components
Chapter 3. Central processor complex design
Chapter 4. Central processor complex I/O structure
Chapter 5. Central processor complex channel subsystem
Chapter 6. Cryptographic features
Chapter 7. Operating system support
Chapter 8. System upgrades
Chapter 9. Reliability, availability, and serviceability
Chapter 10. Hardware Management Console and Support Element
Chapter 11. Environmentals
Chapter 12. Performance
Appendix A. Channel options
Appendix B. System Recovery Boost
Appendix C. IBM Integrated Accelerator for zEnterprise Data Compression
Appendix D. Frame configurations

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