Book Image

Modernizing Legacy Applications to Microsoft Azure

By : Steve Read, Larry Mead
Book Image

Modernizing Legacy Applications to Microsoft Azure

By: Steve Read, Larry Mead

Overview of this book

Organizations have varying circumstances, objectives, and prerequisites when contemplating a hyper-scale cloud solution transformation to a platform such as Azure. Modernizing Legacy Applications to Microsoft Azure uncovers potential scenarios and provides choices, methodologies, techniques, and prospective possibilities for transitioning from legacy applications to the Microsoft Azure environment. You’ll start by understanding the legacy systems and the main concerns regarding migration. Then, you’ll investigate why distributed architectures are compelling and the various components of the Azure platform needed during migration. After that, you’ll explore the approaches to modernizing legacy applications and the Rs of modernizing (i.e., rehost, refactor, rearchitect, and retire). You’ll also learn about integration approaches and potential pitfalls. By the end of this book, you’ll be well equipped to modernize your legacy workloads while being aware of pitfalls and best practices.
Table of Contents (18 chapters)
Part 1: Legacy Estate Options
Chapter 2: Strategies for Modernizing IBM and Unisys Mainframes
Part 2: Architecture Options
Part 3: Azure Deployment and Future Considerations

Strategies for Modernizing IBM and Unisys Mainframes

As we mentioned in Chapter 1, when we refer to mainframes in this book, that covers the IBM Z series and the Unisys Dorado and Libra series. This chapter will cover at an in-depth level the strategies to modernize these mainframes to Azure. Here is a list of topics we will cover:

  • IBM mainframes:
    • z/OS—The most common IBM mainframe operating system
    • z/Virtual Storage Extended (z/VSE)—Similar to z/OS, but usually for smaller workloads
    • z/VM—Z-series virtualization
    • z/Transaction Processing Facility (z/TPF)—For high-volume transaction workloads
    • z/Linux—Linux that can run under z/VM
    • Specialty engines—Integrated Facility for Linux (IFL) and z Integrated Information Processor (zIIP)
  • Unisys:
    • Libra—From the Burroughs Master Control Program (MCP) line
    • Dorado—From the Sperry OS 2200 operating system