Migration Types and Strategies
There are three key migration types in AWS Server Migration Service: homogeneous, heterogeneous, and replatforming. Homogeneous migrations involve moving applications from similar source and target infrastructure, such as VMware to AWS. Heterogeneous migrations involve moving applications from dissimilar source and target infrastructure, such as Hyper-V to AWS. Replatforming involves changing the underlying infrastructure and application architecture during migration. Migration strategies to consider include Lift and Shift, which moves on-premises applications to AWS with minimal modifications, Refactor or Re-architect, which involves redesigning applications to take advantage of new AWS features, and Hybrid Migration, where parts of an application are migrated to AWS while other parts are retained on-premises.
Guide to AWS Server Migration Service: Migration Types and Strategies
What it is and why it's important:
AWS Server Migration Service is a service that allows businesses to migrate their on-premises workloads to the AWS cloud. Understanding different migration types and strategies is crucial as it allows for planning and implementation of a robust and effective migration process.
How it works:
The Migration Types are categorized into three main methods: Rehost (Lift-and-Shift), Re-platform (Lift, Tinker-and-Shift), and Repurchase (Drop-and-Shop). The selection of a type depends on the business requirements, resources, and desired outcomes. The Server Migration Service works by replicating live server volumes to AWS and creating Amazon Machine Images (AMIs) for each volume.
Exam Tips:
Understanding the functionality of different migration strategies is vital for the exam. Remember, Rehost is when you pick up an application from an existing environment and move it to AWS as-is. Re-platform involves some level of modification to the applications before moving to AWS. Repurchase implies abandoning the existing application platform and moving to a different product or service.
It's also essential to understand the advantages of each strategy. For example, Rehosting is often the quickest to implement, while Replatforming offers a more balanced approach, incorporating the benefits of the cloud more fully without the cost of significant application changes. In contrast, Repurchasing is often preferred when looking for an opportunity to adopt a SaaS approach.
In the exam, look for keywords in the questions that hint at which migration strategy is being referred to or best applied. For example, 'quick and fast implementation' hints at Rehosting, while 'modification of applications' can imply Replatforming.
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