What is cloud migration?
Learn about the different types of migration—including cloud to cloud and datacentre migrations—and explore learning resources about a wide variety of cloud migration topics.
Cloud migration definition
Cloud migration is the process of moving applications and data from one location, often a company's private, on-site ("on-premises") servers to a public cloud provider’s servers, but also between different clouds. The main cloud migration benefits include reducing IT costs and improving performance, but there are security, convenience, and other advantages, too.
Keep reading to learn more about the main types of migration, common benefits and challenges, how to move applications and data to a cloud, and the three main managed service models: IaaS, SaaS, and PaaS.
Types of cloud migration
Two key technical factors in most migrations are:
1. the type of resource (or, "workload") that's being migrated, and
2. the location that it's being migrated to.
This section explains some of the most common migration scenarios, and provides an overview of different migration processes, best practises, and business considerations.
Datacentre migration is the process of moving data from on-premises servers and mainframes (often stored in a server room at an organisation’s office), to a cloud provider's servers, which are typically housed in very large, highly secure, and professionally maintained buildings.
High-capacity networks are the most common way to move datacentre resources to the cloud, but when a powerful network isn't available, the resources can still be migrated by first moving them onto high-capacity disks and "data boxes" and then physically shipped to the cloud provider and uploaded to their servers.
Hybrid cloud migration
Many organisations choose to leave some of their resources in their on-premises datacentre and only move a portion of them to the cloud, creating a "hybrid cloud." Hybrid cloud benefits include maximising the value of existing on-premises datacentre equipment, as well as allowing organisations in certain industries to meet industry and governmental compliance requirements.
Hybrid clouds are also useful for cloud to cloud back up, in which on-premises data is backed up on a public cloud as a disaster recovery solution in the event that the on-premises datacentre becomes inoperable, such as in the case of a fire, flood, or crime. (In this case, "cloud to cloud" refers to on-premises datacentres sometimes being called "private clouds.")
Cloud to cloud migration
Now that cloud computing is so common, many organisations are using multiple clouds—often due to mergers and acquisitions—and they sometimes choose to move resources between their public clouds using cloud to cloud migration. This type of migration is also useful when an organization wants to take advantage of different cloud platforms' products, services, and pricing.
While managing resources across multiple clouds might seem difficult, it's possible to conveniently manage them all from a single place using a central management tool.
Application, database, and mainframe migration
Typical cloud migration benefits for these workloads include lower costs, faster and more reliable performance, access to cloud-based developer tools and APIs, more robust security, and the ability to increase or decrease capacity without needing to purchase, install, and maintain new equipment.
While it's often possible to migrate these workloads without making changes to them (known as a "lift and shift" migration), there are benefits to updating (or, "refactoring") them to optimise their performance and reliability on the cloud.
Refer to the resources section for information on how to migrate different workloads.
Managed service models
As you research cloud migration, there's a good chance you'll come across the terms IaaS, PaaS, and SaaS. These terms refer to different levels of managed services that are available through many tech and cloud providers.
IaaS (infrastructure as a service) allows you to quickly scale up and down as demand changes, letting you pay only for what you use. It helps you avoid the expense and complexity of buying and managing your own physical servers and other datacentre infrastructure.
PaaS (platform as a service) includes the benefits of IaaS, but includes managed developer tools, databases, business analytics, and operating systems. It's ideal for reducing development costs and accelerating development time.
SaaS (software as a service) includes IaaS and PaaS, but includes the added convenience of app hosting, which allows users to connect to and use cloud-based apps (such as email and office apps) over the Internet.
Cloud migration stages
There are different technical processes and best practises for migrating different workloads and creating different cloud configurations, but all cloud migrations follow the same basic six stages:
Define the business justification for migration and expected outcomes.
Align the cloud migration plan to the desired business outcomes.
Prepare the on-premises and cloud environments for the migration.
Move the workloads to the cloud environment.
Benchmark and implement security and cost governance best practises for the cloud environment and workloads.
Use proven methodologies for on-going management of the cloud solution.
Cloud migration benefits and challenges
Some of the most common cloud migration benefits are:Learn more about cloud migration benefits
In addition to being able to optimise workloads for cost, there are significant savings in equipment, maintenance, and real estate costs.
Flexibility and scalability
Get exactly the right computing resources when you need them on demand and never pay for equipment that you don't use. And with some cloud platforms' global presence, you can run workloads closer to where your customers are for better performance.
Public clouds make it easier to help protect your data and applications by providing built-in security at the platform level, as well as a variety of specialised security tools. In many cases, security patching is done automatically by the cloud provider.
For highly regulated industries like finance, healthcare, and government, some cloud platforms have specialised offerings to meet compliance requirements more easily.
Back up, recovery, and failover
Most cloud providers offer built-in and one-click back up recovery capabilities, including the ability to store backups in different geographic regions.
Simplified management and monitoring
If the cloud provider offers a central management tool, it's easy to manage and monitor datacentre and cloud resources from a single screen.
Some of the most common migration challenges are:
Moving individual workloads can be straightforward, but planning a large-scale migration requires extensive planning across the organisation.
Moving to the cloud can provide both short- and long-term returns on investment, but it's important to factor in the costs of planning and implementing a migration.
Security and compliance
Cloud providers offer a variety of security and compliance offerings, but customers' are responsible for implementing the right solutions for their needs.
Moving even massive amounts of data to the cloud can be done very quickly, but it requires careful planning to minimise downtime during the move.
Organisational adoption and training
IT professionals and developers will find that most of their current skills apply to the cloud, but some skills training is still required.
Migration partner/vendor selection
Partners are invaluable for organisations that don't have the in-house expertise or capacity to plan and implement their migration, but selecting the right one takes careful consideration.
Frequently asked questions
- Find datacentre migration videos, Microsoft webinars, scenario guides, and learning resources for most common scenarios and workloads on the Azure cloud migration resources page.
- Learn how to bring your mainframe applications to the cloud on the mainframe and midrange migration page.
- Get curated resources and expert help from Azure engineers and partners for every stage of your migration journey through the Azure Migration Programme.
Learn how to implement cost-effective, highly secure, easy-to-manage back up for all of your on-premises and cloud resources with Azure Back up.
For most organisations, the answer depends on the size and complexity of their migration project, as well as their in-house IT capabilities. Azure offers a variety of resources, tools, training, and guidance for both in-house and partner-assisted migrations:
- If you're not sure where to begin, we recommend joining the free Azure Migration Programme to get customised recommendations, a phone consultation with an Azure expert, curated resources, and partner recommendations.
- If you want to implement your migration (or parts of it) on your own, check out the Azure cloud migration resources page for migration videos, webinars, scenario guides, and learning resources for most common scenarios and workloads.
Azure migration resources
Get curated resources and expert help for every stage of your cloud journey
Find videos, scenario guides, and learning resources for common scenarios
Discover, assess, right-size and migrate your on-prem VMs to Azure
Quickly create and deploy mission-critical web apps at scale
Migrate Windows Server workloads using tools you're already familiar with
Move SQL Server databases to Azure with few or no code changes
Migrate Linux workloads to Azure using proven tools
Move mainframe and midrange applications to the cloud
Simplify data protection with one-click cloud to cloud back up
Extend Azure services and management to any infrastructure
Get appliances and solutions for data transfer to Azure and edge compute
Manage your cloud spending with confidence