Entergy powers innovation and saves costs with OpenFrame and Tibero - TmaxSoft
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Case Study
  • Mainframe was over a million dollar annual expense that increased each year
  • Spent several years rearchitecting legacy systems but still had some mission critical applications running on IBM z/OS
  • 15.7 million lines of code, 172 MIPS
  • Mainframe was shut down completely without affecting business or operations
  • The high-performance associated with the mainframe was unchanged
  • Annual run costs decreased by 70%
  • Greater reliability – normalized delivery into a core competency
  • Faster processing times and a smaller application footprint

Company Overview

Entergy is an integrated energy company that owns and operates power plants with approximately 30,000 megawatts of electric generating capacity, including 9,000 megawatts of nuclear power.

It delivers electricity to 2.9 million utility customers in Arkansas, Louisiana, Mississippi and Texas. The company has annual revenues of more than $10 billion and significantly more than 13,000 employees.

Entergy’s purpose is to provide customers with low-emission, reliable energy at a reasonable cost while delivering superior service. The company maintains a strict focus on safety, strives for operational excellence and supports engaged employees.

The challenge

The mainframe system that enabled some of Entergy’s most critical operations was implemented in 1981. They had been rearchitecting their legacy systems but still had some mission critical applications running on IBM z/OS. The cost to support the systems was a over a million dollar annual expense that increased each year, ultimately affecting customers.

These issues needed to be addressed; it was not possible to maintain the status quo any longer. Moving some applications over and a few other options, such as rewriting, were also on the table. However, these were too big of an undertaking with no guarantee of success. As a result, the company realized all mainframe programs, databases, storage, scheduling, and interfaces would have to be ported onto new virtual servers in its virtual environment. Migrating the mainframe was the most viable option.

The solution

TmaxSoft delivered a proof of concept (POC) that showed that programs could be moved without change and that they would perform the same as they had on the mainframe. Entergy saw that the lift from the old platform to a new platform would have huge benefits and enable them to successfully shut down the mainframe.

Entergy selected TmaxSoft to migrate their mission critical applications to the OpenFrame platform and migrate their data to the Tibero RDBMS, both running on Linux. TmaxSoft assisted with application migration, which included recompilation of the application programs on Linux and building both a production and a test environment. The file system (PS, GDG, VSAM) was migrated and ADF COBOL was rewritten to Java. TmaxSoft also provided OpenFrame and Tibero services, mentoring and training for developers and administrators, and product installation and configuration. Entergy’s team learned a great deal along the way about how to take 100 years of power lines and decades of programming and make it all work on a Linux platform.

After the migration, the company reported that processing time was the same and, in some instances, faster than on a mainframe. Significant decrease in annual run costs of over 70%, and the application footprint decreased significantly as well. Entergy’s team even found it to be more reliable than the mainframe with fewer incidents of interruptions of deliveries. The new modernized solution supports growth and innovation, enabling the energy company to better serve their customers.

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