VDI (virtual desktop infrastructure) runs desktop operating systems as virtual machines on central servers and delivers them over a network, so users can work from any device. IT teams manage every desktop centrally, while users get a familiar desktop with their own apps, settings, and files.
For IT managers and leaders, VDI simplifies desktop management, protects data, and supports remote and shared work without maintaining a full workstation for every user. Analyst firm Gartner describes VDI as a full user desktop environment that runs as a virtual machine on a server and is accessed remotely.
VDI Meaning: What Does VDI Stand For?
VDI stands for virtual desktop infrastructure. In plain terms, VDI means that instead of running a desktop on the device in front of you, the desktop runs in a data center or on an on-premises server, and your device displays it. A VDI definition therefore covers both the desktops themselves and the infrastructure that hosts, connects, and manages them. A virtual machine is a single software-based computer, whereas VDI is the full system that delivers many virtual desktops to many users, with built-in brokering, access, and management.
How Does VDI Work?
VDI moves the desktop from the endpoint to a central server, and users connect to it over a network. Five steps describe the process from setup to daily use.
- Host Desktops Centrally: Servers in a data center or cloud host many virtual machines, each running its own desktop operating system.
- Connect Through a Client: Users connect with a client application on a laptop, tablet, or thin client, or through a web browser.
- Exchange Inputs and Display: The client sends keystrokes and mouse clicks to the virtual machine, which sends back the screen and audio output.
- Access From Anywhere: Users can reach their desktops from nearly any location with a network connection.
- Manage Centrally: IT administrators apply updates and security patches to desktops from one place, which reduces downtime.
Key Components of VDI
Three components work together to deliver a virtual desktop. The first is the virtualization platform and hypervisor, which creates and runs the virtual machines that host each desktop. The second is the connection broker, which authenticates users and assigns them to an available desktop. The third is profile management, which stores each user's settings, files, and preferences so their desktop feels consistent every time they log in.
What Is VDI Access?
VDI access lets users remotely connect to a virtual desktop hosted on a central server, so it looks and works like a physical one, complete with their applications, settings, and files.
Access is typically delivered through a remote display protocol or a web-based interface. Users can connect from desktops, laptops, tablets, smartphones, and thin clients, which makes it easier to support remote workers, contractors, and employees who move between locations.
Types of VDI: Persistent vs. Non-Persistent Desktops
VDI desktops fall into two main categories, and the choice affects both user experience and management effort. Persistent desktops give each user a dedicated virtual machine that keeps their changes between sessions. Users can install applications and customize settings, and the desktop looks the same every time they log in. This feels closest to a personal computer, but each desktop needs its own storage and ongoing management. Non-persistent desktops assign users a fresh desktop from a shared image each time they log in, and discard changes when they log out. They are easier to manage and patch because IT maintains one master image, which makes them popular for call centers, classrooms, and shared workstations.
Session-based remote desktop is a related approach in which many users share a single server operating system, rather than each receiving a full virtual machine. It uses fewer resources but offers less isolation, which can matter for graphics-heavy or customized workloads.
| Persistent VDI | non-Persistent VDI | Session-Based Remote Desktop | |
|---|---|---|---|
| Desktop type | Dedicated virtual machine per user | Fresh desktop from a shared image at each login | Shared server session |
| Customization | High; changes are saved | Limited; changes reset on logout | Limited |
| Management effort | Higher | Lower | Lower |
| Best for | Power users and personalized work | Shared and task-based work | Basic applications for many users |
VDI in Cloud Computing: On-Premises VDI vs. Cloud-Hosted Desktops
VDI in cloud computing can take several forms, depending on where desktops are hosted and who manages the infrastructure. The comparison below shows how on-premises VDI, cloud-hosted VDI, and desktop-as-a-service differ.
| On-Premises VDI | Cloud-Hosted VDI | Desktop as a Service (DaaS) | |
|---|---|---|---|
| Where desktops run | Organization's own data center or edge site | Organization's account in a public cloud | Provider-managed cloud service |
| Who manages infrastructure | The organization | Shared between the organization and the cloud provider | The service provider |
| Control | Highest | High | Lower |
| Cost model | Upfront hardware investment with predictable operating costs | Pay-as-you-go; can rise with usage | Subscription per user |
| Best for | Data control, low latency, and predictable workloads | Variable demand and geographic reach | Fast setup with minimal infrastructure management |
VDI Deployment Model Compared
On-permises VDI
RUNS IN
Organization's data center or edge site
MANAGED BY
The organization
Cloud-hosted VDI
RUNS IN
Organization's public cloud account
MANAGED BY
Shared with the cloud provider
Desktop as a service
RUNS IN
Provider-managed cloud service
MANAGED BY
The service provider
Benefits of VDI
VDI changes how organizations deliver and manage desktops, and five benefits stand out for most IT teams.
- Centralized Management: IT maintains desktop images, updates, and security settings from one place instead of touching every device.
- Stronger Security and Data Control: Data stays on central servers rather than on individual laptops, which reduces the impact of lost or stolen devices.
- Remote and BYOD Access: Employees, contractors, and partners can reach their desktops from approved personal or company devices.
- Lower Desktop Hardware Costs: Thin clients and older devices can display virtual desktops, extending hardware lifecycles.
- Faster Onboarding and App Updates: New users can receive a ready desktop quickly, and IT can apply application updates once and deliver them to everyone.
Challenges of VDI
VDI delivers real advantages, but it also asks more of infrastructure and planning than traditional desktops. Knowing the challenges early helps teams design around them.
- Upfront Cost and Complexity: VDI requires servers, storage, networking, and software, and historically has been complex to design and deploy.
- Bandwidth and Latency: Because the desktop runs remotely, a slow or unreliable network can affect responsiveness and user experience.
- Windows Licensing: Virtual desktops carry their own licensing requirements, which need to be planned and tracked carefully.
- Graphics-Heavy Work: Design, engineering, and video workloads may need GPU resources to deliver acceptable performance.
VDI Cost Considerations
VDI costs fall into direct and indirect categories, and a complete picture includes both. Direct costs include server and storage hardware, virtualization and desktop licensing, networking, and power and cooling. Indirect costs include the staff time needed to design, operate, and support the environment, as well as the cost of downtime if the platform is unavailable. Organizations should also account for savings, such as reduced desktop hardware spending and less time on device-by-device maintenance. Because costs vary widely by deployment size, user type, and licensing agreements, a workload-based estimate is more reliable than a general figure.
VDI Use Cases and Examples
VDI fits situations where central control, security, and flexible access matter most. Four use cases come up repeatedly.
Remote and Hybrid Work: Employees get a consistent desktop whether they work from the office, home, or on the road.
Healthcare: Clinicians can sign in to their desktop from different workstations while patient data stays on central systems.
Education Labs: Schools and universities can deliver lab software to any device without installing it on every machine.
Contractors and BYOD: Temporary workers and personal devices can reach approved applications without placing company data on the endpoint.
Where Scale Computing™ Fits
Scale Computing provides the virtualization layer that VDI software runs on, and it pairs with proven connection brokers.
SC//HyperCore™ Hypervisor serves as the foundation, combining compute, storage, and virtualization on hyperconverged infrastructure that is designed to be simple to deploy and manage. For connection brokering, it works with Leostream or Parallels RAS, which handle user authentication and desktop assignment. Together, they let lean IT teams run VDI on Scale Computing with high availability, without the complexity of assembling separate components.
Conclusion
VDI centralizes desktops so IT teams can manage, secure, and update them from one place while users work from nearly any device. The right approach depends on factors such as desktop type, hosting location, network conditions, and cost, so it helps to define workloads and user needs before choosing a platform. To discuss how Scale Computing supports virtual desktop deployments, request a demo.
Frequently Asked Questions
What does VDI stand for?
VDI stands for virtual desktop infrastructure, a technology that hosts desktops on central servers and delivers them to users over a network.
What is the difference between VDI and a virtual machine?
A virtual machine is a single software-based computer, while VDI is the full system that hosts, brokers, and manages many virtual desktops for many users.
What is the difference between VDI and remote desktop (RDS)?
VDI gives each user a full virtual machine with its own operating system, while remote desktop services share one server operating system among many user sessions.
Is VDI the same as desktop as a service (DaaS)?
No, VDI is typically managed by the organization on its own or cloud infrastructure, while DaaS is delivered and managed by a third-party provider as a subscription.
What do you need to run VDI?
You need servers with a hypervisor, a connection broker, storage, a reliable network, desktop licensing, and client devices or software for users to connect.