Beyond Rehosting: How Enterprises Can Rethink Their Legacy Migration Strategy

A reality that binds every enterprise is a system that has become outdated and requires immediate modernization. However, modernization is tough in more ways than one. Not only does your infrastructure change, but your employees need training, it takes time to bring back returns on revenue, and your customers need to understand sudden delays and unexplained errors too.

Legacy system transformation does not have to be difficult; it depends on what strategy you use. Let’s read about each of them that are available to you and that you can employ based on your requirements, budget, and migration capability.

Why Rehosting is Not Always a Choice

Rehosting is a legacy migration strategy built for enterprises that are not ready for a complete move from their usual work method with the aging system. It is the shifting of legacy applications to a modern platform without any change in their code.

It is often called the lift-and-shift migration. While it is a good choice for companies that do not wish to spend money, waste time, or expend effort in a heavyweight migration process, it brings several risks.

For one, you have to prepare for a full-scale migration with the time you have saved. Secondly, you now have to divide your technical staff into two groups, one to look over the tasks for the future migration and one for everyday maintenance and problem-solving.

On top of that, any disruption or inefficiency that was carried by the software gets brought over to the new hardware-backed system. Optimization and scalability are limited as well.

Legacy Migration Strategies Beyond Rehosting

There are quite a few methods of legacy migration that you can opt for beyond rehosting. They depend on the available level of expertise, your budget for the process, and your short- and long-term requirements. They are:

1. Replatforming – It refers to making minor, targeted improvements in the system without any changes to the application.

2. Refactoring – It makes significant changes to the software code to improve scalability, performance, etc. without any modifications to its architecture.

3. Rearchitecting – As the name suggests, it makes changes to the architecture of the applications, usually moving from a monolithic structure to microservices.

4. Rebuilding – It is defined as the rewriting of an application entirely from ground zero, without the influence of the previous version.

5. Replacing – Compared to rebuilding, replacing buys a different application or SaaS option after retiring the old one.

6. Encapsulation – It encloses the legacy software inside a modern interface, like APIs, service layers, etc., allowing modern systems to interact with it without any contact.

Choose well only after careful examination and consideration.

Risks to Avoid During Legacy Migration

Legacy system migration risks build up slowly and strike with precision. Yet, they can cause severe problems for technical and non-technical employees alike. You can expect:

· Dependencies that you did not realize were present as they were never consciously made or documented

· Data inaccuracies or incompleteness despite a good result from test migration

· Downtime that arises during the migration process in spite of attempts to minimize it

· Compatibility issues that show up when moving data from the legacy system to the new one

· Sensitive data that are often revealed during the migration leading to breaches and malware

· Data that may be too immense in volume for an uncomplicated migration process

Risks will exist for any process, and that includes legacy migration. Taking active steps to avoid them is the best way to prevent any jeopardies.

Final Words

Legacy system migration is more than just moving from one application to another or updating an existing one. It requires careful planning and execution, followed by post-migration assessment.

With the help of a renowned emulation enterprise like Stromasys, you will get assistance at every step of the lift-and-shift migration process. Your applications will breathe free of outdated hardware without understanding the change at all.