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

Good ol’ VMs

In the case of a rehost or refactor of the mainframe workloads, you will quite often need to consider VMs. This is the oldest and probably most common deployment option. Not because it is better, but because it has been around longer than any of the other options we are going to consider. Even before distributed platform virtualization was available, mainframe workloads were offloaded by various methods onto physical machines. It was quite logical for this model to incorporate VMs when that technology became available. Let’s have a look at the benefits and things to consider when deciding on this option.


Let’s look at the benefits of VMs:

  • As we mentioned, the solutions available by mainframe rehosting and refactoring vendors—with the exception of a few—all run on VMs. This is because most IT shops are very familiar with the care and feeding of this deployment model. They are reliable and, with modern tooling, easy...