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Mainframe modernization in Asia: Transition Journey of a major bank

29. 04. 2024

A major Asian bank transitions from the VSE operating system to z/OS. We are here to share the process with you.

A major Asian bank transitions from the VSE operating system to z/OS. We are here to share the process with you. 

The need for mainframe modernization

We’re excited to kick off a significant migration project in Asia, marking the commencement of our partnership with a major regional bank in collaboration with IBM.  This project shows how we tailor solutions to the specific needs and challenges of our customers in dynamic markets.   

In collaboration with IBM and the client, we conducted live, detailed project planning sessions to establish precise steps for successful project execution. This strategic approach enables us to identify potential challenges, allocate resources effectively, and establish clear milestones to track progress throughout the project lifecycle. 

The customer expressed an urgent need to modernize its mainframe infrastructure. In particular, the transition from the VSE operating system to z/OS is critical to improving performance, scalability and security and meets the customer’s long-term business goals and compliance requirements.   

Stages of the project

As the very first step of the project, led by IBM’s excellent coordination and project management, and with good cooperation from the customer side, CROZ conducted an assessment phase to gather all details about the running z/VSE environment (hardware and software architecture, hardware configuration, software inventory, software and operating system configurations, system management patterns, security settings and management, application inventory, type and size of application data, application lifecycle management, regulatory requirements, etc.).  

Assessed details have been used as a solid foundation for the second, planning phase, where we mapped customer requirements/expectations and gathered details with the z/OS platform, to build a new environment which will have all the functionalities as thean old one, but will be designed to meet all criteria for a sustainable platform capable of easy upgrades and enhancements keeping up with technological standards.   

The following phases of the project are: 

  • Pre-migration activities  
  • Migration activities 
  • Post-migration support 
  • Knowledge transfer 

Since some of the upcoming phases are still have not yet been conducted, we will write about them in future blog articles. 

Benefits for the Client

At the end of the project, the Customer will experience all the advantages of the z/OS platform, comparing it with z/VSE:  


Since z/OS is designed to support larger workloads and scale, better than z/VSE. The customer will be able to address the need for the growth of an organization’s IT requirements over time without significant architectural changes.  

Enhanced Performance 

Compared to z/VSE, z/OS offers superior performance capabilities, particularly for large-scale transaction processing and data-intensive applications. This will result in faster response times and increased throughput for critical business operations.  

Advanced Features  

z/OS provides a broader range of advanced features and capabilities compared to z/VSE. These include support for complex networking protocols, advanced security features, high availability and disaster recovery solutions, and extensive middleware and application integration options. New, advanced features will help customers to easily follow new technical requirements and standards.  

Integration with Modern Technologies  

z/OS is more tightly integrated with modern technologies and industry standards, making it easier to integrate mainframe systems with other platforms, applications, and services within the customer IT ecosystem. This integration will facilitate interoperability and data exchange between mainframe and distributed systems, as well as better control of application lifecycle management.  

Long-Term Support  

Z/OS is IBM’s strategic operating system making it a more sustainable choice for organizations planning for the future. This will reduce the risk of platform obsolescence and minimize the need for frequent migrations or upgrades.  

Compliance and Regulatory Requirements  

Especially for organizations operating in regulated industries such as finance, healthcare, or government, migrating to z/OS is necessary to meet specific compliance and regulatory requirements. z/OS offers robust security and audit capabilities that can help the customer demonstrate compliance with industry standards and regulations.  

The Importance of Modernization for Large Banks and Other Mainframe Users

Large banks and other mainframe customers, usually run their critical business systems on mainframe. They value the reliability, scalability and security of the mainframe platform; however, they keep this critical the infrastructure updated. Additionally, lots of today’s enterprises want to further optimize mainframe applications and architecture by enhancing applications, adding capabilities, modernizing user interfaces, etc.   (hybrid-cloud, DevOps, machine learning, data-streaming) with traditional mainframe technologies. We help our clients create a roadmap to transform the mainframe expand its capabilities and maintain competitive advantage in the industry. 

How We Can Assist with Your Mainframe Modernization

As mainframe technology consultants, we support our clients in the successful and seamless migration and modernization of their mainframe systems. As part of each project, we ensure that strict deadlines are met and the highest level of quality is maintained to guarantee a successful migration that preserves all business functionality and data. At the same time, the system platform is consolidated, optimized, standardized and made more secure. As a result, it will comply with IBM’s best practices and guidelines and be prepared for further modernization steps. 

With our team of experts and extensive experience in managing large-scale projects, we are well-equipped to assist organizations in navigating the complexities of mainframe modernization and migration. We know what needs to be done and how to do it, ensuring top quality and successful outcomes for our clients.    

Header image credits go to Sean Pollock on Unsplash.

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