What Is IaaS? A Business Owner’s Guide to Infrastructure as a Service

The global infrastructure as a service market grew 22.5% in 2024, reaching $171.8 billion according to Gartner. That growth is not slowing down. As businesses move workloads off aging physical servers and into the cloud, IaaS has become the foundation that modern IT infrastructure runs on. 

But for many business owners, the terminology is still confusing. What is infrastructure as a service? How does it differ from other cloud computing models? does it make sense for a company of my size? 

This is a full guide to IaaS, breaking down what it is, how the pricing works, whether or not you need it, and the best IaaS providers as well as how they can be managed.

Table of Contents

• What Is Infrastructure as a Service (IaaS) in Cloud Computing? 
• The Shared Responsibility Model 
• Core Components of IaaS: Computing, Storage, and Networking 
• IaaS Security and Compliance: Protecting Your Business in the Cloud 
• IaaS Deployment: Choosing the Right Approach for Your Organization 
• IaaS Management: Best Practices for Operational Success 
• IaaS vs PaaS vs SaaS: Understanding Cloud Service Models 
• Top Infrastructure as a Service Providers in the US 
• How To Compare Infrastructure as a Service Pricing Models 
• Common IaaS Use Cases for Business 
• Benefits and Challenges of IaaS for Mid-Sized Businesses 
• Build a Smarter IT Strategy with LeadingIT 

What Is Infrastructure as a Service (IaaS) in Cloud Computing?

Infrastructure as a service (IaaS) is a cloud computing model where a cloud service provider owns and manages the underlying infrastructure, including physical servers, storage systems, networking equipment, and data centers. Instead of purchasing and maintaining that physical infrastructure yourself, you rent virtualized computing resources from the provider on demand. 

Think of it this way: a traditional on-premises data center requires your business to buy servers, install them in a facility, wire the networking, manage the cooling, and handle every hardware failure. With IaaS, the cloud provider handles all of that. You get access to the same computing resources (virtual machines, storage, networking) through an internet connection. You do not own a single rack of physical hardware. 

The Shared Responsibility Model

IaaS operates on a shared responsibility model that defines who manages what: 

• The cloud service provider manages: Physical servers, data centers, networking hardware, virtualization layer, power, cooling, and physical security 

• Your organization manages: The operating system, middleware, applications, data, and access controls running on that cloud infrastructure 

This is an important distinction. The IaaS provider keeps the lights on and the hardware running. But everything that actually makes your business work — your applications, your files, your security settings, your user accounts — is still on your plate. 

For most small and mid-sized businesses, that is a lot to take on without a dedicated IT team. This is exactly where a managed IT partner steps in. The right partner does not just handle one layer. They take ownership of the full picture — your cloud environments, your on-premises systems, your security, your compliance, and any vendor relationships that need to be coordinated — so that you have one point of contact for all of it. 

At LeadingIT, that is exactly how we operate. We manage your IaaS environments, your operating systems, your applications, your security, your access controls, and anything else that touches your technology. If a piece of the puzzle requires a specialized vendor, we manage that relationship on your behalf. The result is that your team stays hands-off while your entire infrastructure is fully managed. Learn more about our managed IT services. 

Core Components of IaaS: Computing, Storage, and Networking

Every IaaS platform is built on three foundational pillars. Understanding what each delivers helps business owners evaluate which cloud infrastructure resources they actually need. 

Compute

Compute is the processing power that runs your applications and workloads. In an IaaS model, compute resources are delivered through virtual machines (VMs). These are software-based servers that behave like physical machines but run on shared hardware in the provider’s data centers. 

Each virtual machine can be configured with a specific amount of CPU, memory, and its own operating system. 

Need a Windows server for a line-of-business application? One can be set up in minutes. Need a separate environment for a different workload? It can be configured to your exact specifications. 

The key advantage is that you can scale resources up during busy periods and scale them back down when demand drops, paying only for what you use. 

A single physical machine in a provider’s data center can host dozens of virtual servers at the same time through virtualization technology. This is what makes IaaS infrastructure so cost effective compared to purchasing dedicated hardware for every workload. 

Storage

Cloud providers offer multiple storage tiers designed for different use cases: 

• Block storage: High-performance storage that attaches directly to virtual machines, similar to a local hard drive. Used for databases, operating system volumes, and applications that need fast read/write speeds. 

• Object storage: Scalable, cost-effective storage for unstructured data like backups, media files, logs, and archives. Designed to store and manage data at massive scale across multiple servers. 

• File storage: Shared file systems accessible by multiple virtual machines at the same time. Useful for collaboration, shared application data, and workloads that expect a traditional file structure. 

All major cloud providers replicate stored data across geographically distributed data centers for redundancy. If one facility experiences an outage, your data remains accessible from another location. 

Networking

Networking resources connect your virtual machines, storage, and applications to each other and to the internet. Cloud platforms provide: 

• Virtual networks: Isolated network environments where IP addressing, subnets, routing tables, and firewall rules are configured 

• Load balancers: Distribute incoming traffic across multiple servers to prevent any single instance from becoming overwhelmed 

• DNS and content delivery: Route users to the closest or fastest endpoint for your applications 

• VPN and private connectivity: Secure connections between your on-premises environments and cloud infrastructure 

The physical network — the fiber, switches, and routers that carry your traffic — is entirely the provider’s responsibility. Networking is configured through management tools without touching any physical hardware. 

IaaS Security and Compliance: Protecting Your Business in the Cloud

Security and compliance are top priorities for any business using infrastructure as a service. While your cloud service provider manages the underlying infrastructure — including physical servers, networking resources, and the physical security of their data centers — your organization is responsible for securing your own data, applications, and operating systems within the cloud. 

Leading IaaS providers invest heavily in securing their physical infrastructure with protections such as 24/7 surveillance, biometric access controls, and redundant power and networking systems. On top of this, they provide security features designed to help you safeguard your cloud environment, including built-in firewalls, encryption for data at rest and in transit, identity and access management tools, and detailed activity logging. 

However, the shared responsibility model means someone on your side must take an active role in protecting your workloads. This includes configuring access controls, keeping operating systems up to date, and monitoring for suspicious activity. It also means making sure your cloud infrastructure complies with industry regulations such as GDPR, HIPAA, or PCI DSS, depending on your sector. IaaS providers offer compliance certifications and tools to help, but ultimate responsibility for your data and application security rests on your side of the fence. 

For most Chicagoland SMBs without a full internal security team, this is where a managed IT partner with comprehensive cybersecurity services becomes essential. The right partner handles security monitoring, threat detection, compliance management, and incident response across your entire environment — so your team does not have to become security experts overnight. 

IaaS Deployment: Choosing the Right Approach for Your Organization

Selecting the right IaaS deployment model is a strategic decision that impacts your organization’s flexibility, security, and cost structure. The three primary approaches — public, private, and hybrid cloud — each offer different advantages depending on your business needs. 

Public clouds, such as Google Cloud, Microsoft Azure, and Amazon Web Services (AWS), provide on-demand access to scalable computing resources. These providers allow you to scale resources up or down as needed and benefit from the latest innovations in cloud computing without investing in your own hardware. Public cloud is ideal for businesses seeking flexibility, growth, and cost-effective infrastructure management. 

Private clouds offer a dedicated environment, either hosted on-premises or by a third-party service provider. This approach gives you greater control over your infrastructure, making it easier to meet strict security or compliance requirements. Private clouds are well-suited for organizations with sensitive data or specialized workloads that demand a higher level of isolation. 

Hybrid clouds combine the best of both worlds, allowing you to run certain workloads in the public cloud while keeping others in a private environment. This model lets you manage infrastructure efficiently, handle spikes in demand through the cloud, and maintain control over critical data. 

When evaluating IaaS deployment options, consider your organization’s needs for scalability, security, compliance, and cost management. The right approach will depend on your specific business requirements and the guidance of your IT partner. 

IaaS Management: Best Practices for Operational Success

Effective IaaS management is essential for getting the most value out of your cloud infrastructure and keeping day-to-day operations running smoothly. 

If you work with a managed IT partner like LeadingIT, here is the good news: you do not have to worry about any of this yourself. These are the best practices that your IT team or IT partner should be following behind the scenes to keep your cloud environment healthy, secure, and cost-effective. We include them here so you understand what good IaaS management looks like and can evaluate whether your current setup measures up. 

Proactive monitoring. Your IaaS resources — virtual machines, storage, and networking — should be actively monitored around the clock to catch performance issues and control costs before they become problems. Most IaaS providers offer management tools and dashboards that provide real-time visibility into your cloud infrastructure. Your IT partner should be using these tools to stay ahead of issues, not waiting for something to break. 

Automation. Routine tasks like deploying virtual machines, applying patches, and running maintenance should be automated wherever possible. Automation reduces the risk of human error, speeds up routine work, and frees up time for more strategic projects. This is one of the biggest advantages of working with an experienced IT partner — they bring the tools and processes that most small businesses cannot build on their own. 

Clear policies and access controls. Only authorized users should be able to modify your IaaS resources. Regular backup and recovery processes should be in place and tested. Security practices should be consistent across your entire cloud environment. These steps minimize downtime, protect your data, and ensure compliance with both internal standards and external regulations. 

When these best practices are followed consistently, your IaaS infrastructure becomes a reliable, cost-effective foundation for your business. With the right managed IT partner handling this work, your team can focus on running the business instead of managing servers. 

IaaS vs PaaS vs SaaS: Understanding Cloud Service Models

If you are a business owner trying to make sense of cloud terminology, here is the most important thing to know upfront: most small and mid-sized businesses use a mix of cloud service models every day, often without realizing it. You are probably already using SaaS applications like Microsoft 365 or your accounting software. If your business has servers hosted in the cloud, you are using IaaS. The two work side by side. 

IaaS is one of three primary cloud service models. Each represents a different level of the technology stack that the cloud provider manages on your behalf. 

What Each Model Covers

SaaS (Software as a Service) is the model most business owners are already familiar with, even if they do not know the name. The provider manages everything — the physical infrastructure, the operating system, and the application itself. You simply log in and use the software through a web browser. Examples include Microsoft 365, Salesforce, QuickBooks Online, and Google Workspace. 

IaaS (Infrastructure as a Service) gives you the most control. The provider delivers the physical infrastructure and virtualization layer. Your team (or your IT partner) manages everything above that: the operating system, applications, and data. This model is built for workloads that need specific configurations or cannot be replaced by off-the-shelf software — things like hosting your line-of-business application, running a database server, or maintaining a file server in the cloud. 

PaaS (Platform as a Service) sits in the middle. The provider handles infrastructure plus the operating system and development tools. This model is designed for software development teams that want to build and deploy custom applications without managing the underlying servers. For most small and mid-sized businesses that are not building their own software, PaaS is rarely a factor. 

What This Means for Your Business

For most Chicagoland SMBs, the day-to-day reality is a combination of SaaS and IaaS. Your team uses SaaS applications for email, productivity, and collaboration. Your core business systems — the servers that host your applications and store your critical data — run on IaaS. Your managed IT partner manages all of it so you do not have to think about where one model ends and another begins. 

Top Infrastructure as a Service Providers in the US

The IaaS market is dominated by a small number of cloud providers. According to Gartner’s 2024 market share analysis, the top five IaaS providers control 82% of the global market. Here is how the major players compare. 

Amazon Web Services (AWS)

AWS holds the largest share of the IaaS market at approximately 38% of worldwide revenue. It offers the broadest catalog of cloud computing services across compute, storage, networking, databases, machine learning, and analytics. According to the Flexera 2025 State of the Cloud Report, 53% of SMBs run workloads on AWS, making it the most popular platform among small and mid-sized businesses. 

AWS is a strong fit for organizations that need breadth of services, global reach, and a mature ecosystem of third-party integrations. 

Microsoft Azure

Azure holds the second-largest market position at approximately 24% of worldwide IaaS revenue. Its primary advantage is deep integration with Microsoft products: Active Directory, Microsoft 365, Dynamics 365, and the broader enterprise Microsoft ecosystem. Azure leads among larger enterprises, particularly those already invested in Microsoft tools. 

For Chicago businesses running Microsoft-centric environments, Azure often provides the simplest migration path from on-premises infrastructure to the cloud. 

Google Cloud

Google Cloud holds the third position and continues to grow. Its strengths center on data analytics, machine learning, and cloud-native workloads. Google Cloud is a strong choice for organizations with heavy data processing requirements or teams building cloud-native applications. 

Oracle Cloud Infrastructure

Oracle Cloud is purpose-built for database-heavy workloads, ERP migrations, and organizations already operating within the Oracle ecosystem. For businesses running Oracle databases or Oracle-based applications, Oracle Cloud Infrastructure often delivers better performance and lower cost than running the same workloads on competing IaaS platforms. 

Choosing the Right IaaS Vendor

No single provider is best for every business. The right choice depends on your existing infrastructure, application requirements, compliance needs, and the expertise of your IT partner. Most organizations use multiple cloud providers. Flexera’s 2025 report found that 70% of organizations now use hybrid cloud strategies combining public cloud, private cloud, and on-premises environments. 

How To Compare Infrastructure as a Service Pricing Models

One of the biggest challenges for business owners evaluating cloud infrastructure is understanding how pricing works. Unlike a traditional on-premises data center where you pay a large upfront cost and then maintain the equipment, IaaS shifts costs to an operational model. But the details matter, and the pricing structures vary significantly between providers. 

Common Pricing Structures

• Pay-as-you-go (on-demand): You pay for computing resources by the hour or second with no long-term commitment. This model provides maximum flexibility but carries the highest per-unit cost. Best for variable or unpredictable workloads. 

• Reserved instances: Commit to a 1 to 3 year term and receive significant discounts, often 30 to 60% off on-demand rates. Best for stable, predictable workloads where you know your capacity requirements in advance. 

• Spot or preemptible instances: Purchase excess capacity at steep discounts (sometimes 60 to 90% off). The trade-off is that the provider can reclaim these resources with short notice. Best for batch processing, non-critical jobs, and tasks that can tolerate interruption. 

Hidden Cost Factors

The compute cost is only part of the picture. Several additional factors affect your total IaaS spending: 

• Data egress charges: Most providers charge for outbound data transfer. Moving large volumes of data out of the cloud can add significant cost. 

• Storage tiering: Frequently accessed data costs more to store than archived data. Choosing the wrong tier wastes money. 

• Networking and load balancers: Traffic between availability zones, regions, or back to your on-premises environments carries fees. 

• Support plans: Basic support is often free. Premium support with faster response times and dedicated account management adds cost. 

• Management tools: Advanced monitoring, security, and compliance tools from the IaaS vendor typically carry separate charges. 

The Cloud Waste Problem

Flexera’s 2025 research found that 84% of organizations say managing cloud spend is their top challenge, and organizations exceed their cloud budgets by an average of 17%. Cloud waste on IaaS remains around 27% of total spend. For a Chicagoland business spending $10,000 per month on cloud infrastructure, that means roughly $2,700 per month is going to resources that are either oversized, unused, or misconfigured. 

This is one reason mid-sized businesses benefit from working with an IT partner that provides virtual CIO guidance on cloud strategy. A strategic advisor helps right-size your IaaS resources and select the most cost-effective pricing model for each workload, preventing the budget overruns that plague organizations managing cloud costs on their own. 

Common IaaS Use Cases for Business

Infrastructure as a service is not a one-size-fits-all solution. It is a flexible foundation that supports a wide range of business needs. Here are the most common IaaS use cases for mid-sized organizations like those across Chicagoland. 

Hosting Line-of-Business Applications

Many small and mid-sized businesses rely on specialized software that cannot be replaced by an off-the-shelf SaaS product — things like industry-specific ERP systems, practice management platforms, custom databases, or legacy applications that the business depends on daily. IaaS lets you move these applications off aging on-premises servers and into the cloud without rewriting or replacing them. 

For a law office running case management software, a manufacturer using an ERP system, or an accounting firm with a specialized tax platform, IaaS provides a way to keep those critical tools running on modern, reliable infrastructure without a major hardware investment. 

Disaster Recovery and Business Continuity

IaaS provides a cost-effective foundation for disaster recovery planning. Instead of maintaining a secondary physical data center for failover, organizations replicate critical systems to geographically distributed cloud infrastructure. If a primary site goes down, workloads fail over to the cloud automatically. 

This model dramatically reduces the cost of business continuity planning. You pay for standby resources at a fraction of the cost of maintaining duplicate physical hardware, and you can scale recovery resources up instantly during an actual event. 

Cloud-Based File Storage and Collaboration

For businesses with remote workers or multiple office locations, IaaS provides centralized, secure file storage that is accessible from anywhere with an internet connection. Instead of relying on a single file server sitting in an office closet, your data lives in a cloud environment with built-in redundancy, automated backups, and access controls. 

This is especially valuable for organizations across Chicagoland with employees working from home, traveling between job sites, or operating out of multiple locations. Everyone accesses the same files, securely and reliably, without depending on a single piece of hardware. 

Web Hosting and E-Commerce

Cloud infrastructure lets organizations host websites and customer-facing applications that scale up and down based on traffic. A seasonal business can increase capacity during peak periods and reduce it during slower months, paying only for the resources it uses. 

For Chicago businesses running customer-facing web applications, this flexibility means you do not need to over-buy hardware for peak demand or risk downtime during traffic spikes. 

Hybrid Cloud Environments

Many organizations use IaaS alongside their on-premises systems in a hybrid setup. This approach lets businesses keep sensitive data or certain workloads on local servers while using cloud infrastructure for backup, additional capacity, or specific applications. 

Hybrid cloud is one of the most common configurations for mid-sized businesses because it provides flexibility without requiring a full migration away from existing on-premises equipment. Your IT partner can help determine which workloads belong in the cloud and which make more sense to keep local. 

Benefits and Challenges of IaaS for Mid-Sized Businesses

Understanding both the advantages and the risks of infrastructure as a service helps business owners make informed decisions about whether and how to use IaaS. 

Benefits

Eliminates upfront hardware costs. Instead of spending tens or hundreds of thousands of dollars on physical servers, storage hardware, and networking equipment, you shift to a predictable monthly expense. Hardware procurement and maintenance become the provider’s problem. 

Scales with your business needs. IaaS lets you add resources when demand grows and scale them back when it drops. You are not locked into a fixed capacity that takes months to expand. 

Increases operational efficiency. Your team spends time on business operations and strategic work instead of dealing with server maintenance, firmware updates, and hardware failures. The cloud service provider manages the physical infrastructure so you do not have to. 

Speeds up deployment. New servers and environments go live in minutes instead of weeks. There are no procurement cycles, no shipping delays, and no installation appointments. When your business needs to move fast, cloud infrastructure removes the bottleneck. 

Supports geographic flexibility. Employees, customers, and partners can access cloud-hosted applications and data from anywhere with an internet connection. For businesses with remote workers or multiple office locations across Chicagoland, this is a significant operational advantage. 

Challenges

Cloud cost management is complex. As Flexera’s research demonstrates, most organizations struggle to forecast and control cloud spending. Without discipline around resource sizing, reserved instances, and usage monitoring, costs can escalate quickly. 

Security is a shared responsibility. The provider secures the underlying infrastructure. Everything above that — including your data, applications, access controls, and configurations — requires active management. Organizations that assume the cloud provider handles all security expose themselves to risk. Pairing IaaS with comprehensive cybersecurity services ensures that your side of the shared responsibility model is fully covered. 

Vendor lock-in is a real concern. Building deeply on one provider’s proprietary services can make it difficult and expensive to switch later. Organizations should consider portability when selecting IaaS solutions. 

Compliance requires planning. Certain industries require data residency controls, encryption standards, and audit capabilities that vary by provider and region. Businesses in regulated sectors need to verify that their IaaS vendor meets their specific compliance requirements. 

Managing IaaS requires expertise. Configuring cloud environments, securing them properly, optimizing costs, and managing infrastructure at scale requires skills that many mid-sized businesses do not have in-house. This is the gap that a managed IT partner fills — providing the expertise to manage your full infrastructure, align cloud investments with business goals, and prevent costly missteps. 

Build a Smarter IT Strategy with LeadingIT

Infrastructure as a service gives businesses of every size access to enterprise-grade computing resources without the burden of owning and maintaining physical hardware. But IaaS is only one piece of the puzzle. Most businesses also rely on SaaS applications, on-premises systems, and hybrid environments that all need to work together — securely, reliably, and within budget. 

That is where LeadingIT‘s managed IT services come in. We do not just help you navigate cloud decisions. We manage your entire IT infrastructure end-to-end — your cloud environments, your on-premises systems, your security, your compliance, and any vendor relationships that need to be coordinated. We do more than your average MSP, whether a task is handled directly by our team or through a vetted partner we manage on your behalf, the experience for you is the same: one point of contact, fully managed, completely hands-off. 

Whether you are migrating your first workloads to the cloud, optimizing an existing environment, or building a hybrid strategy that connects cloud and on-premises systems, our team has you covered. 

✅ Predictable monthly pricing ✅ No long-term contracts ✅ 14-day instant onboarding 

Schedule a free IT risk assessment to evaluate your current infrastructure and identify where cloud services fit your business strategy.