What is IaaS?
Infrastructure as a service
Infrastructure as a service (IaaS) is a type of cloud computing service that offers essential compute, storage and networking resources on demand, on a pay-as-you-go basis. IaaS is one of the four types of cloud services, along with software as a service (SaaS), platform as a service (PaaS) and serverless.
Migrating your organisation's infrastructure to an IaaS solution helps you reduce maintenance of on-premises data centres, save money on hardware costs and gain real-time business insights. IaaS solutions give you the flexibility to scale your IT resources up and down with demand. They also help you quickly provision new applications and increase the reliability of your underlying infrastructure.
IaaS lets you bypass the cost and complexity of buying and managing physical servers and datacentre infrastructure. Each resource is offered as a separate service component and you only pay for a particular resource for as long as you need it. A cloud computing service provider like Azure manages the infrastructure, while you purchase, install, configure and manage your own software—including operating systems, middleware and applications.
Common IaaS business scenarios
This is the fastest and least expensive method of migrating an application or workload to the cloud. Without refactoring your underlying architecture, you can increase the scale and performance, enhance the security and reduce the costs of running an application or workload.
Test and development
Your team can quickly set up and dismantle test and development environments, bringing new applications to market faster. IaaS makes it quick and economical to scale dev/test environments up and down.
Storage, backup, and recovery
Your organisation avoids the capital outlay for storage and the complexity of storage management, which typically requires a skilled staff to manage data and meet legal and compliance requirements. IaaS is useful for handling unpredictable demand and steadily growing storage needs. It also can simplify planning and management of backup and recovery systems.
IaaS provides all the infrastructure to support web apps, including storage, web and application servers and networking resources. Your organisation can quickly deploy web apps on IaaS and easily scale infrastructure up and down when demand for the apps is unpredictable.
High-performance computing on supercomputers, computer grids or computer clusters helps solve complex problems involving millions of variables or calculations. Examples include protein folding and earthquake simulations, climate and weather predictions, financial modelling and product design evaluations.
Advantages of IaaS
Reduces capital expenditures and optimises costs
IaaS eliminates the cost of configuring and managing a physical datacentre, which makes it a cost-effective choice for migrating to the cloud. The pay-as-you-go subscription models used by IaaS providers help you reduce hardware costs and maintenance and enable your IT team to focus on core business.
Increases scale and performance of IT workloads
IaaS lets you scale globally and accommodate spikes in resource demand. That way, you can deliver IT resources to employees from anywhere in the world faster and enhance application performance.
Increases stability, reliability and supportability
With IaaS, there is no need to maintain and upgrade software and hardware or troubleshoot equipment problems. With the appropriate agreement in place, the service provider assures that your infrastructure is reliable and meets service-level agreements (SLAs).
Improves business continuity and disaster recovery
Achieving high availability, business continuity and disaster recovery is expensive because it requires a significant amount of technology and staff. But with the right SLA in place, IaaS helps to reduce this cost. It also helps you access applications and data as usual during a disaster or outage.
With the appropriate service agreement, a cloud service provider can offer better security for your applications and data than the security you would attain in house.
Helps you innovate and get new apps to users faster
With IaaS, once you have decided to launch a new product or initiative, the necessary computing infrastructure can be ready in minutes or hours, rather than in days or weeks. And because you don't need to set up the underlying infrastructure, IaaS lets you deliver your apps to users faster.
Frequently asked questions
Platform as a service refers to cloud computing services that supply an on-demand environment for developing, testing, delivering and managing software applications. PaaS is designed to make it easier for developers to quickly create web or mobile apps, without worrying about setting up or managing the underlying infrastructure of servers, storage, network and databases needed for development.
Software as a service is a method for delivering software applications over the internet, on demand and typically on a subscription basis. With SaaS, cloud providers host and manage the software application and underlying infrastructure. These providers also handle any maintenance, like software upgrades and security patching. Users connect to the application over the internet, usually with a web browser on their phone, tablet or PC.
Cloud computing is the delivery of computing services using a network of remote servers hosted on the internet to store, manage and analyse data.
A hybrid cloud is a type of cloud computing that combines on-premises infrastructure—or a private cloud—with a public cloud. Hybrid clouds allow data and apps to move between the two environments.
Most cloud computing services fall into four broad categories: infrastructure as a service (IaaS), platform as a service (PaaS), serverless and software as a service (SaaS). These are sometimes called the cloud computing “stack” because they build on top of one another.
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