JOURNEY TO THE CLOUD
A Guidepost for a Collaborative Modernization Approach
Understand your short and long term cloud goals,
and formulate a strategy to achieve them
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The drivers for moving workloads to the cloud are well documented: Organizations need to simplify operations, reduce costs, and increase application agility to meet market demands. Additional motivations for moving workloads to the cloud include balancing the need to meet regulatory compliance requirements with the desire to greatly increase innovation, performance, and scalability.
But the critical question for organizations to first answer is: What are the specific cloud destination options, and what is the recommended approach to get there? To be effective, organizations need a strategy that fully maximizes cloud benefits, including, but not limited to, leveraging a cloud-native landscape.
Short and Long-Term Destination Options
LEGACY TO CLOUD
The selected cloud destination will ultimately depend on the customer’s desired short and long-term goals.
Advanced has the unique ability and experience to migrate legacy workloads to any cloud destination: cloud ready, cloud optimized, or cloud native. The below graphic provides an overview of the three different cloud destination options:
Disposition Strategies Mapped to Cloud Destinations
LEGACY TO CLOUD
The starting point of any modernization journey should be a comprehensive assessment – encompassing applications, operations, and the supporting infrastructure. Assessment results should look to validate any pre-selected disposition strategies (sometimes referred to as modernization patterns), and ultimately assist in defining the overall modernization approach. Depending on the long term goals – the approach often includes a combination of disposition strategies. For example, a long term goal of re-engineering a large, complex mainframe monolith into cloud-native microservices can be broken into several incremental steps:
- Refactor applications to a cloud-native language such as Java or C# and run containerized in a cloud ready environment.
- Optimize applications to obtain desired level of elasticity at the container level, running in a cloud optimized environment. In parallel, re-engineer specific functionality identified during the assessment phase with Java-based microservices.
- Continue to optimize the application, incrementally re-engineering to microservices and progressing towards a cloud native environment, realizing that it may not be necessary to replace the entire monolith in the short or long term. It’s important for each application to be analyzed critically via an in-depth assessment in order to understand the reality that parts of the monolith might be better served remaining intact.
Disposition Strategies - An Overview
JOURNEY TO THE CLOUD
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Rehost
A proven, mature approach based on an environment that runs on distributed platforms and emulates the legacy operating environment. The emulation capability minimizes the amount of change that occurs when migrating legacy systems to a distributed platform. Source code is recompiled where possible, and customized to support the specific Rehost technology. Data is migrated – with the structure of some original data types retained, including Relational, VSAM, Sequential, GDGs, among others. Operational functionality provided by third party solutions such as job schedulers, print and output management, security, and systems management solutions are replaced in order to support the same processing capabilities as the original legacy environment.
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Refactor
Our Automated Refactoring approach retains functional equivalence while converting core legacy applications to fully maintainable, refactored object-oriented Java or C# code. Once the legacy application and database is refactored, developers can extend application functionality directly without the need to navigate the original legacy code. Critical business logic from the legacy system is preserved, while enabling deeper integration with other Java or C# workloads and additional customization to meet evolving business requirements.
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Optimize
Various levels of optimization can be applied during or following an Automated Refactoring project. Code is analyzed during the assessment to determine application cloud-readiness and the required optimization effort to obtain the desired level of elasticity (i.e. horizontal scalability [scale out/in] and vertical scalability [scale up/down]) required by the application workloads being migrated.
Because mainframe-based applications are stateful by nature, they require modifications in order to take advantage of the dynamic scaling abilities provided in a cloud-optimized environment. If scaling is desired, the assessment phase will allow for identification of areas where state is being stored on the application tier, such as the use of shared memory (e.g. CICS TS Queues, TD Queues, CWA, TWA if applicable) in addition to anywhere the applications are reading/writing local files, logs, and configuration scripts. At this point Advanced can provide customers with options that weigh the pros and cons for addressing each state-specific issue. Examples include leveraging a distributed cache to support state, and moving any local file access to a scalable shared file system.
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Re-Engineer
Sometimes referred to as rewrite, re-engineering captures original application specifications, and then redesigns and develops the new solution using the latest application frameworks. In addition, re-engineering incorporates any required new functionality, which is a common driver for selecting this approach. Re-engineering delivers a completely customized solution that meets exact requirements, leveraging the latest application frameworks, architectures and practices such as cloud-native microservices and DevOps. The primary business outcome for re-engineering is increased application agility to more quickly meet evolving market demands.
ModPaaS, our bespoke modernization solution, is available today on Amazon Web Services (AWS), Microsoft Azure, and Google Cloud marketplaces.
Additional insights to help you modernize
RESOURCES
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2021 Mainframe Modernization Report
Explore the the impact Covid-19 is having, and will continue to have, on modernization plans, and the case for application modernization among large enterprises with annual revenues over $1 billion.
Read report -
Know the details, reduce the risk
This whitepaper gives an in-depth explanation on why a detailed assessment of legacy applications and databases is essential for proper strategic modernization planning and decision-making.
Read whitepaper
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Live Discussion: The 2021 Mainframe Modernization Business Barometer Report
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How cloud migration can help your organization to go green
Blog Read blog -
Know the details, reduce the risk: How to begin your mainframe modernization journey
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Struggling to adopt DevOps? Maybe it’s because of your ageing mainframe
Blog Read blog
