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)
1
Part 1: Legacy Estate Options
3
Chapter 2: Strategies for Modernizing IBM and Unisys Mainframes
6
Part 2: Architecture Options
10
Part 3: Azure Deployment and Future Considerations

Summary

So, as you can see, when you hear someone say that they have a mainframe, it can mean different things. Sometimes, they may actually be referring to a mid-range system, such as an Application System/400 (AS/400) or Unix system. The types of mainframes that you would most like to modernize will be either IBM or Unisys, and as you can see from this chapter, they have different approaches for how you modernize them.

We will get into the actual how to modernize later in the book. For now, the intent is to show that IBM and Unisys mainframes, while somewhat similar, are different systems that need to be approached differently.

We have now covered both common types of mainframes. The next chapter will cover midrange systems, such as the iSeries (AS/400) and Advanced Interactive eXecutive (AIX).