Today, there is no single cloud computing model. Cloud technologies have expanded, matured and proliferated to support organizations' most demanding business purposes. The proliferation of cloud technologies is particularly confusing to businesses new to cloud adoption, and they are sometimes baffled by the distinction between multi-cloud and hybrid cloud. Both architectures have a distinct definition and purpose. Here we will tease them apart and offer some tips on how to select the best architecture for your applications and business goals. A multi-cloud technology strategy involves two or more cloud computing platforms or providers to handle various business tasks. A business might perform some tasks that use AWS, another set of tasks with Google Cloud Platform, and yet other tasks with Microsoft Azure. A multi-cloud approach can be extensive and complex depending on the number of clouds involved and the ways that a business consumes each cloud resource or service. For example, a business might employ a public cloud provider's IaaS to host its workloads. At the same time, it could use specialized SaaS or PaaS providers for business services such as productivity tools (Office 365), employee expense tracking and reporting (Concur), and so on, where each service is its own cloud. Benefits of multi-cloudSo why undertake such complexity? There are some compelling reasons why a business might explore a multi-cloud approach. They are as follows:
Challenges of multi-cloudThe complexities of a multi-cloud approach extend beyond just juggling resources, services and third-party providers. Organizations that embrace a multi-cloud environment potentially face some new risks and challenges rarely posed by on-premises infrastructure, such as the following:
Multi-cloud management toolsAny organization with a multi-cloud approach must recognize the resources and services it uses, understand their configurations and monitor their performance. IT teams can use tools to handle multiple clouds from a single interface. These tools support a wide array of cloud platforms such as AWS and Azure as well as complementary tools such as Kubernetes to manage container-based workloads. Multi-cloud management tools also should support strong abstraction, orchestration and automation; handle security such as identity management and data encryption; control policy governance and compliance; monitor performance of the infrastructures and applications; and help manage costs. A hybrid cloud technology strategy merges a private cloud or on-premises infrastructure, or both, with a public cloud environment to create a single cloud computing environment that combines the best of both. A business might create a private cloud to support self-service resource provisioning for software developers, or run an important cloud-native application locally. The business can also connect that private cloud to a public cloud to gain extra resources or use specialized services.
Types of hybrid cloudsThe key to a hybrid cloud is uniformity -- consistent access and delivery of resources and services that smoothly integrate public and private clouds. There are two popular approaches to establish a uniform hybrid cloud infrastructure. The traditional approach is to build a private cloud stack, using common platforms such as OpenStack that can integrate with a public cloud. These are sometimes referred to as "heterogeneous" hybrid clouds because the resulting hybrid cloud infrastructure includes technologies and platforms from a variety of providers. Another approach is to use specialized appliances that contain the software stack and services specifically designed to integrate with the desired public cloud. Examples include Azure Stack, Google Anthos and AWS Outposts. These are sometimes called "homogeneous" hybrid clouds because the resulting infrastructure incorporates technologies from a single public cloud provider. An enterprise must consider the costs, performance and management requirements, as well as the technology roadmap, to choose the hybrid cloud program that best fits its needs. Benefits of hybrid cloudOrganizations may choose to add a hybrid cloud strategy for a variety of reasons, including the following:
Challenges of hybrid cloudWhile a well-designed hybrid cloud can offer compelling benefits for a busy enterprise, there are also various hybrid cloud drawbacks to consider, including the following:
Hybrid cloud and multi-cloud deployment models differ in purpose and infrastructure design, and consequently they have similarities and differences. Both hybrid and multi-cloud do the following:
At the same time, there are important distinctions, such as the following:
Can a hybrid cloud be multi-cloud?Given their similarities and differences, hybrid cloud and multi-cloud are typically regarded as separate approaches or architectures, both with their own purpose. However, hybrid clouds and multi-clouds can coexist. A business can build a private cloud for internal use, merge that private cloud with a public cloud to create a hybrid cloud, and then add or integrate multiple other clouds (whether IaaS, PaaS or SaaS) to deliver specific resources or services to the business. Similarly, a business could create a hybrid cloud with one public cloud provider, but also consume the resources and services of other public clouds outside of the hybrid cloud environment. It is theoretically possible to create a "hybrid multi-cloud," but this would require a private cloud that integrates with two or more public clouds simultaneously. In practice, the complex technical hurdles involved in such simultaneous integrations are rarely worth the effort. Only the largest and technically adept enterprises with demanding hybrid project requirements should consider such an endeavor. The general criteria to choose a hybrid or multi-cloud strategy can be reduced to a matter of ownership or control. The choice isn't always obvious or easy, but it will always be driven by specific business needs and goals. When to choose a hybrid cloud strategy: A business requires cloud flexibility, resources, and services, but is obligated (by choice or regulatory standards) to host certain data or workloads locally and cannot place that data or workloads outside of the organization's on-premises data centers or direct geopolitical control. For example, a business wants to build cloud-native applications and host some applications in the public cloud, but must run certain critical workloads locally. When to choose a multi-cloud strategy: A business requires services, resources, infrastructure or cost models provided by specific cloud providers. For example, a business might opt for VM and storage instances from one public cloud provider, business applications (such as productivity or finance) from various SaaS providers and perhaps AI/ML cloud services or language cloud services from other cloud providers. Always choose a cloud architecture based on specific business needs and goals. There is no "best" cloud. Rather, understand the complexities and challenges that each cloud option presents.
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