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

Azure databases

When it comes to database offerings in Azure, there are essentially two types you need to consider:

  • IaaS database offerings
  • Database as a Service (DBaaS)

IaaS databases and standard database servers that you are probably familiar with are ones such as SQL Server, Db2, and Oracle. These all run just as you would expect in Azure VMs in your Azure estate. To install them, you need to provision a VM with the proper OS configuration and install the database of your choice. If you have a substantial investment in Db2 and as a result have employees who are very familiar with Db2 Database Administer (DBA) administration and management, you can migrate your Db2 in z/OS to Db2 in Azure, which is Db2 LUW (which stands for Linux, Unix, and Windows). It should be noted here that Db2 for z/OS and DB2 LUW are different products and have different performance characteristics. The point here is that you can deploy them in Azure just as if you were deploying them on...