Introduction

As technology advances organizations are going to rent services such as servers, computation and storage and pay as you go basis. This trend of renting resources instead of actually buying it is known as cloud computing. When an organization decides to move from a physical or on-premises system to the cloud, this process is called cloud migration. In simple words, cloud migration is the process of migrating storage centres, IT infrastructure and application from on-premises resources to cloud infrastructure.

The shift has become possible because organizations want to take advantage of cloud infrastructure when it comes to cost optimization, better disaster recovery and improved scalability. Other than these basic advantages, cloud technology helps businesses stay connected with advanced technologies like Machine Learning and Artificial intelligence.

Cloud migration decisions often come when companies are facing rising cost of data canters, on-premises infrastructure is aging and they need to support remote workforces. It’s either about meeting growing data storage needs or enabling cloud native features that cannot be possible with on-premises resources the organizations choose to migrate to cloud.

Types of Migration

Different types of cloud migration are possible depending upon the need and solution required for the application. On the border level there are the following categories of cloud migration.

• Cloud to cloud migration
• Data center migration
• Hybrid cloud migration
• Multicloud migration
• Workload specific migration

Cloud to cloud migration

When an organization wants to avoid being dependent on a specific vendor, or want to take advantage of better pricing plans they move from one cloud provider such as AWS, Azure, Google cloud platform, IBM cloud to another. This category of migration is known as cloud-to-cloud migration.

Data centre migration

The migration is known as data centre migration when the company moves the entire functions of the organization to the cloud,  consolidating any physical resource. This happens mostly because companies want to end costly on-site hardware maintenance and eliminate the burden of expensive data centre leases.

Hybrid cloud migration

Some workloads are managed on-site while others are moved to the cloud through hybrid cloud migration. This strategy works effectively, When regulatory limitations necessitate some programs to remain on-premises while others can benefit from cloud features. Research studies claims that companies that use a hybrid cloud strategy can significantly boost their value as compared to one who are depending only on one public cloud platform. It is claimed by top nosh cloud providers that businesses can actually realize 2.5 times more value.

Multicloud migration

Organizations that use a multicloud strategy split workloads among several providers, maximize on the advantages of each platform, and save expenditures. This method lessens dependency on any one vendor and allows flexibility.

Workload specific migration

This strategy focuses on relocating databases, specific workloads, or mainframes in order to benefit from cloud computing. When organizations intend to update their systems without immediately committing to a complete migration process, they start with Work-load specific migration.

Challenges of cloud migration

Implementing cloud computing can turn out to be crucial for any organization, thus an organized implementation cloud strategy is required. Because of their complicated, undocumented and unorganized dependence, it could be challenging to relocate the on-premises system. Performance issues can also arise from applications designed for on-premises infrastructure resulting them performing poorly in cloud environments. Delay in the network connection affects systems that require real-time data processing or run-time and frequent communication.

Security and compliance issues require careful preparation to guarantee that data protection and legal requirements are satisfied in the cloud. Cloud expenses can skyrocket in the lack of proper cloud consulting as teams spin up resources without considering the consequences.

To develop and implement a successful cloud migration strategy it is important to understand 7 R’s of cloud migration.

Understanding the 7 R’s of cloud migration

Success of cloud migration strategy depends on the 7 R’s. Each with a special use case and the trade off.

• Rehost (lift-and-shift)
• Relocate
• Replatform
• Refactor (rearchitect)
• Repurchase (drop-and-shop)
• Retire
• Retain (revisit)

Let’s explore each of them one by one here.

Rehost (lift-and-shift)

Rehosting is the process of moving applications to the cloud without impacting the architecture or application code. This is also referred to as lift-and-shift, applications go from on-premises infrastructure to cloud architecture exactly as they are, usually using virtual machines (VMs).

When businesses need to move rapidly and don’t have the resources to redesign apps this approach is most effective. This also works when the organization wants to reap the benefits of cloud computing like lower data center costs and cutting-edge technologies without spending much.

Relocate

By moving virtual machines directly between environments, relocation transfers workloads without changing programs. In this strategy moving VMware-based workloads to cloud environments is a common step.

This method allows businesses with large VMware infrastructure costs to swiftly move virtual machines while preserving operational consistency and keeping their current virtualization layer intact.

Replatform

During cloud migration, replatforming optimizes programs specifically to leverage cloud capabilities without altering the underlying architecture.

Containerizing apps or moving structured query language (SQL) databases to managed services like Amazon RDS are typical examples of replatforming.

Refactor (rearchitect)

Refactoring changes the process by which developers create applications by entirely rearchitecting apps into cloud based solutions. This procedure involves implementing serverless computing or dividing monolithic programs into microservices. With DevOps methodologies, continuous integration and deployment are made possible by these architectures’ compatibility.

Organizations choose this approach when adding capabilities that are challenging with the current architecture, applications require substantial scalability enhancements, or when long-term operational efficiency justifies the initial expenditure.

Repurchase (drop-and-shop)

Repurchasing substitutes cloud-based software as a service (SaaS) alternatives for current programs. Organizations choose a new, cloud-native solution rather than moving their current software.

For applications where commercial SaaS providers offer comparable or superior functionalities, this approach makes sense. Additionally, it makes sense when migrating legacy apps would be more expensive than using a SaaS substitute.

Retire

Retiring means figuring out which applications are no longer required and taking them down. Projects involving cloud migration frequently show that some programs have little economic value in relation to their cost.

Applications are retired by organizations when usage data indicates low adoption, their capabilities are replaced by other systems, or the costs of migration exceed the applications’ commercial value.

Retain (revisit)

Retaining refers to maintaining applications in their existing setting, at least initially. These apps remain on-site with the intention of reviewing the migration choice at a later time. Applications that are stable and recently upgraded, applications with compliance requirements that must be met prior to migration, and those with intricate dependencies requiring additional planning time can all benefit from this cloud migration approach.

Frequently Asked Questions

1. What are the different types of cloud migration?

Cloud migration includes several approaches such as cloud-to-cloud migration, data center migration, and hybrid migration. Each type depends on business needs, existing infrastructure, and long-term goals.

2. What is data center migration in cloud computing?

Data center migration is the process of moving applications, workloads, and data from on-premise servers to cloud environments. It helps businesses reduce hardware costs, improve scalability, and increase operational efficiency.

3. What are the 7 Rs of cloud migration?

The 7 Rs are a set of strategies used to migrate applications to the cloud. These include rehost, replatform, repurchase, refactor, retire, retain, and relocate. Each strategy is chosen based on application complexity and business objectives.

4. How do I choose the right cloud migration strategy?

The right strategy depends on factors such as cost, time, technical complexity, and business goals. For example, rehosting is faster but less flexible, while refactoring provides long-term benefits but requires more effort.

5. What are the biggest challenges in cloud migration?

Common challenges include cost overruns, data security concerns, downtime risks, and lack of expertise. Proper planning and cloud consulting can help businesses overcome these challenges effectively.