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What is the best way to design and implement a cloud migration strategy for a complex legacy system?

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Cloud migration is the process of moving applications, data, and infrastructure from on-premises or legacy systems to cloud-based platforms. It can offer many benefits, such as scalability, flexibility, cost-efficiency, and security. However, cloud migration can also pose many challenges, especially for complex legacy systems that may have multiple dependencies, customizations, or integrations. How can you design and implement a cloud migration strategy that minimizes risks and maximizes results? Here are some key steps to follow.

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Comprehensive assessment:

Before diving into cloud migration, thoroughly evaluate your current system's hardware, software, and applications. This knowledge is crucial in bridging the gap to the cloud environment smoothly.
Start with minimal changes:

When moving to the cloud, initially keep alterations to a minimum. This helps establish a baseline for performance and cost which is essential for understanding the migration's impact and ensuring you reap the benefits of reduced infrastructure expenses.

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1 Assess your current state

Before you plan your cloud migration, you need to understand your current system and its requirements. You should conduct a thorough assessment of your applications, data, and infrastructure, and identify their dependencies, performance, security, and compliance needs. You should also evaluate your business goals, budget, and timeline for the migration. This will help you determine the scope, feasibility, and priorities of your cloud migration project.

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Lakshmanan Sethu

?LinkedIn Top AI Voice | Helping Customers with Google Cloud AI/ML,Data Solutions | Published Author | Speaker
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Implementing cloud migration strategies for legacy systems is cumbersome . This is mainly because legacy systems are built on on premise’s environment and lot of technical debts if we consider lift & shift to cloud migration . The first step is to document the current state and identify the gaps to work on to future state - application deployment on cloud . There are many factors to consider 1. On premise hardware configuration 2. Licensed software information n support for cloud 3. Inventory of applications & databases 4. Security requirements 5. Compliance standards 6. Business user locations 7. Scalable & reliability metrics .

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2 Choose your cloud model

The next step is to choose the cloud model that best suits your system and goals. There are three main types of cloud models: public, private, and hybrid. Public clouds are hosted and managed by third-party providers, such as AWS, Azure, or Google Cloud, and offer high scalability, availability, and affordability. Private clouds are hosted and managed by your own organization, and offer more control, security, and customization. Hybrid clouds are a combination of public and private clouds, and offer more flexibility, interoperability, and innovation. You should weigh the pros and cons of each model, and consider factors such as cost, performance, security, compliance, and integration.

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3 Select your migration strategy

Once you have chosen your cloud model, you need to select your migration strategy. There are six common migration strategies, also known as the 6 Rs: rehost, replatform, refactor, repurchase, retain, and retire. Rehost means to lift and shift your system to the cloud without any changes. Replatform means to make some minor changes to your system to optimize it for the cloud. Refactor means to rearchitect your system to leverage cloud-native features and services. Repurchase means to replace your system with a cloud-based solution. Retain means to keep some parts of your system on-premises or legacy. Retire means to eliminate some parts of your system that are no longer needed. You should choose the strategy that aligns with your business objectives, technical capabilities, and migration resources.

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Orell Garten

I build data products for industrial companies | Freelance ????
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The 6Rs are a good strategy all in all. Keep changed minimal first while rehosting from your on-prem server to a public cloud. Keep changes simple and establish a good baseline (performance, cost, …) to understand how changes affect ot. If changes end up costing you more or decrease performance consider rolling back because after all, the cloud is supposed to decrease your spending for infrastructure.

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4 Execute your migration plan

After you have selected your migration strategy, you need to execute your migration plan. You should follow a structured and iterative approach, and use tools and best practices to automate and streamline the migration process. You should also test and validate your migrated system at every stage, and monitor and troubleshoot any issues that may arise. You should also communicate and collaborate with your stakeholders, such as your users, customers, vendors, and partners, and ensure a smooth transition to the cloud.

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5 Optimize your cloud system

The final step is to optimize your cloud system after the migration. You should review and measure the performance, security, reliability, and cost of your cloud system, and identify any areas for improvement. You should also leverage cloud-native features and services, such as analytics, AI, DevOps, and serverless, to enhance your system's functionality and efficiency. You should also adopt a continuous improvement mindset, and update and innovate your system as your business needs evolve.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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What is the best way to design and implement a cloud migration strategy for a complex legacy system?

1

2

3

4

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1 Assess your current state

2 Choose your cloud model

3 Select your migration strategy

4 Execute your migration plan

5 Optimize your cloud system

6 Here’s what else to consider

Cloud Computing

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What is the best way to design and implement a cloud migration strategy for a complex legacy system?

1

2

3

4

5

6

1 Assess your current state

2 Choose your cloud model

3 Select your migration strategy

4 Execute your migration plan

5 Optimize your cloud system

6 Here’s what else to consider

Cloud Computing

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