Since remote, hybrid, and BYOD policies have become an economic reality in the past decade, VDI offers a secure and cost-effective way to manage these modern business operations. The tech enables centralized control of data, reducing security risks while allowing employees to work more flexibly than ever before.
Let’s break down VDI technology and provide a clear picture of its architecture, benefits, use cases, challenges, and how it compares to alternatives.
What Is Virtual Desktop Infrastructure (VDI)?
Virtual Desktop Infrastructure (VDI) is a technology that hosts desktop environments on a central server, allowing employees to access their workspaces from various devices and locations.
Imagine logging into your work computer from home, and everything looks and feels exactly the same: your files, apps, and settings are all there. That’s what Virtual Desktop Infrastructure delivers. Instead of running an operating system and applications directly on a physical device, these virtual desktops, running as individual Virtual Machines (VMs), are brought to you over a network.
For those interested in the technical details, VDI desktop sessions are streamed to endpoints using display protocols such as RDP, PCoIP, or HDX.
Let’s run through the core components that make virtual desktop environments possible:
- Virtual Machines (VMs): These are the individual digital copies of desktop operating systems (like Windows or Linux) along with their installed applications and user data. Each user interacts with a dedicated virtual machine (in persistent VDI) or a newly generated one (in non-persistent VDI).
- Hypervisor: VMs are managed by a hypervisor, the foundation of VDI. It’s software that creates, runs, and administers the VMs on the central server. It allocates resources, including processing power, memory, and storage to each machine.
- Connection broker: The connection broker verifies user credentials and then assigns the person to the correct VM, or a randomized one from a pool containing multiple virtual desktops.
- Endpoints: These are the devices users work from, like laptops, tablets, smartphones, and thin clients (lightweight computing devices specifically designed for remote desktop services). The endpoint device essentially acts as the display and input interface (keyboard, mouse, or touchscreen) for the virtual desktop.
- Display protocols: These are technologies that stream the desktop session.
This simplified workflow offers a quick look at VDI in practice:
- User logs in from their device → Client (the software or browser that connects to VDI) → Broker (authenticates user’s credentials and assigns a desktop) → Virtual Machine on server (runs the virtual desktop in the data center) → Desktop session (user interacts with apps and files remotely)
Next, we explain the workings and backend components in more detail.
How Does VDI Work?
As mentioned above, a hypervisor serves as the virtualization foundation. It’s the core backend component, hosting and managing the VMs and allocating server resources to the desktops. VMware ESXi and Microsoft Hyper-V are widely used examples of hypervisors.
The broad VDI workflow is fairly straightforward. We’ll walk through the action steps:
- User action: You, the user, initiate a connection request from your device, e.g., your laptop.
- Client software: Specialized client software (often a small application on your device) communicates securely with the VDI environment.
- Connection broker interaction: Your connection request reaches the connection broker. Connection brokers act as the “traffic controllers” of a VDI environment, ensuring users reach the correct virtual desktop securely and efficiently. They also handle session management and load balancing.
Common examples of connection brokers are Citrix StoreFront / Delivery Controller (for Citrix systems) and VMware Horizon Connection Server (for VMware Horizon). - VM allocation: The broker identifies an appropriate Virtual Machine for you. In persistent VDI, this will be your personalized desktop. In non-persistent VDI, it will be a fresh, generic desktop.
- Desktop session delivery: The server hosting the VM sends your virtual desktop session back to your laptop endpoint over the network using a display protocol.
Display protocols are the technologies that transmit the visual display of the virtual desktop from the server to your laptop and relay your keyboard and mouse inputs back. Common display protocols include PCoIP, HDX, and RDP.
During your session, you interact with this desktop as if it were running locally.
Persistent vs Non-persistent VDI
To cater to different session needs, Virtual Desktop Infrastructure offers two distinct models:
- Persistent VDI: In this setup, each user gets the same desktop every time they log in. It’s like having your own physical computer, with a dedicated VM that retains your files, settings, and installed applications for a consistent, personalized experience.
- Non-persistent VDI: Here, users connect to a pool of generic VMs. Each time you begin a session, a clean, standard desktop is spun up for your use. Any changes made during the session are usually discarded once you log off. This model lends itself to task-based work and environments prioritizing standardization and quick desktop deployment.
Storage Systems
Storage is another key backend component. Each virtual desktop needs storage space for:
- Operating System images
- Applications and updates
- User profiles and data
- Temporary files and system logs
In many cases, storage requirements can exceed 100GB per desktop, especially in environments with rich media, large applications, or persistent desktops.
VDI deployments often rely on high-performance storage systems to deliver the functionality expected. These can range from traditional SANs (Storage Area Networks) to modern all-flash arrays.
The Benefits of VDI
Research clearly demonstrates the growing need for technological solutions to online business operations. In 2024, 22.9% of the U.S. workforce worked remotely, up from 19.6% in 2023. Virtualized desktops offer several advantages for organizations. Consider the following valuable benefits:
- Flexibility: The ability to access working desktops from anywhere, on any device, is at the core of VDI’s appeal. Flexibility empowers remote work and “bring your own device” (BYOD) protocols. It facilitates easy work on the go and smooth transitions between “office” locations.
- Simplified management: IT administrators can manage and update all virtual desktops from a single central location. This streamlines tasks like software deployment, patching, and OS upgrades.
- Cost efficiency: Cost efficiencies are typically achieved in the medium term because older and less powerful devices can still run a VDI desktop. This allows companies to extend the life of existing hardware and limit spending on new machines. Centralized maintenance and lower energy usage create additional savings.
- Enhanced data security: VDI offers security advantages because the entire environment is centrally managed from the data center. All information from a VDI connection lives on the server, not the user’s device. This reduces the risks of data loss if a device is stolen or compromised.
- Business continuity and disaster recovery: Centralized virtual desktops can be more easily backed up and restored in the event of a disaster, supporting stronger business continuity.
- Scalability: Desktop virtualization allows organizations to scale up or down as needed. With a few clicks, administrators can quickly and easily add or remove users and VMs.
VDI Use Cases
To better understand Virtual Desktop Infrastructure in action, let’s look at some real-world applications:
- Healthcare: Hospitals and other healthcare centers leverage VDI to provide clinicians, wards, and teams access to patient records and clinical apps from various locations within the facility or remotely. Centralized control helps improve security and HIPAA compliance.
- Education: In schools and universities, students access lab environments and other learning resources from their personal laptops or tablets. Easy access helps with learning while cutting down on the need for physical teaching spaces.
- Remote workers and teams: Remote desktop virtualization provides a fully functional workspace for remote, hybrid, and global employees. Virtual desktops similarly support secure remote access for project/contract workers and field operators.
- Enterprise IT: In large corporations, VDI ensures employees have secure and managed access to all the tools they need to do their jobs. The corporate services are available regardless of the user location or type of device.
- Call centers/BPOs: Desktop virtualization solutions are also popular in call centers and Business Process Outsourcing firms. These environments benefit from easy scaling, a uniform setup, and secure, compliant access to essential applications for large teams.
Challenges and Limitations of VDI
While a virtual desktop environment brings definite advantages, there are some challenges and limitations you should know about.
- High upfront infrastructure cost: Setting up VDI involves upfront expenditure on servers, storage, networking, and licensing. You may also need to fund additional IT expertise to deploy and manage the system. This expensive initial outlay may be a financial barrier, especially for smaller companies.
- Network dependency (latency): Critically, VDI depends on network performance and adequate bandwidth. To deliver a smooth, low-latency experience, even for resource-intensive applications, you may need to invest in a network infrastructure upgrade.
- Performance issues with graphics-heavy workloads: VDI can struggle to handle applications that rely heavily on graphical processing. Think CAD (Computer-Aided Design), video editing, and 3D modeling. To meet these demands, you may need to purchase specialized hardware such as virtual GPUs (vGPUs).
- Licensing complexity (e.g., Windows VDA, CALs): Virtual environments require additional licenses, such as Windows Virtual Desktop Access (VDA) or Client Access Licenses (CALs). Understanding and managing third-party licenses and the VDI software itself introduces extra complexity, especially as user numbers grow.
- IT skill requirement for setup and maintenance: Deploying and maintaining a VDI environment requires specialized IT skills and expertise. Organizations must often invest in training existing staff or onboarding/ contracting personnel with virtual desktop experience.
Are There Alternatives to VDI?
DaaS (Desktop as a Service) is the most commonly considered alternative to VDI. DaaS provides similar virtual desktop functionality without the need to own or maintain the underlying infrastructure (which is managed by a trusted third-party provider).
For businesses looking to reduce capital expenses, scale quickly, and outsource the complexity of setup, maintenance, and upgrades, DaaS is a viable alternative. That said, many organizations prefer VDI for its control, security, and centralized management.
How to Deploy VDI?
Setting up a VDI environment is a big project that needs careful evaluation and planning. Here’s a helpful checklist to guide a successful deployment:
Assess business and user needs
Start by assessing how a VDI solution could transform the organization and what it will take to move from your current state to the virtual infrastructure.
Does your existing network support the performance you’re targeting? How many users are projected (currently and into the future)? Scope your app and software requirements (including persistent vs. non-persistent). Your remote work and BYOD policies and future staffing models are all relevant considerations here.
Select a VDI platform
When selecting a VDI platform, evaluate factors like:
- Cost
- Licensing
- Cloud vs. on-premise deployment
- Compatibility and integration with your existing systems
VMware Horizon, Citrix DaaS, or Microsoft Azure Virtual Desktop are leading, widely deployed solutions.
Develop an endpoint strategy
Decide on the devices to be deployed. Are these thin clients, repurposed PCs, or personal devices (BYOD)? Maybe all of the above? Ensure endpoints support secure access and performance requirements. What endpoint management tools will you use for updates and monitoring?
Build core infrastructure
Design the VDI architecture and configurations. Then build out the necessary servers, storage, networking, and any specialized hardware (such as GPU acceleration) to support the performance and scalability you’re aiming for.
Create and Manage Desktop Images
Build standardized desktop templates tailored to different user roles. Use application layering or virtualization to make updates and maintenance faster and easier.
Configure security and access controls
Adopt multi-factor authentication, encryption, and role-based access to protect the VDI environment. Include threat monitoring and detection tools, and enforce compliance policies through centralized management systems.
Pilot, deploy, and monitor
It’s always wise to roll out the implementation in phases:
- Run a pilot with a sample group to test and validate performance and user experience.
- Onboard users and scale gradually. Monitor usage, latency, and resource consumption.
- Give staff training where needed so the entire team gets onboarded successfully and knows how to get the best from the new setup.
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Acrisure Cyber’s managed IT services and cybersecurity risk management professionals are here to assist you improve the efficiency, security, and scalability of your business. Our experienced team has helped many organizations of different sizes across several industries deploy Virtual Desktop Infrastructure successfully. We can help you, too.
Please connect to discuss how our team can bring real value to your VDI project.
FAQs
What is the difference between VDI and DaaS?
VDI is hosted on an organization’s own infrastructure and administered in-house. Sometimes VDI is hosted in a private or public cloud, but it’s still managed by the organization’s IT team.
DaaS (Desktop as a Service) is a cloud-based service where a third-party provider can host and manage virtual desktops.
Is VDI more secure than using a VPN?
A properly set up VDI usually provides stronger security than a VPN by centralizing data on servers, reducing risks from compromised devices. A VPN (virtual private network) mainly secures data in transit through encryption and conceals the user’s IP address.
Can VDI support video conferencing and Zoom?
Yes. VDI can support video conferencing, including Zoom. Some setups may require the Zoom VDI plugin to ensure smooth audio, video, and screen sharing. Properly configured, it works almost like running Zoom on a local device.
What kinds of devices can connect to a VDI?
VDI can be accessed from a wide variety of devices, including:
- Desktops and laptops: Standard Windows, macOS, or Linux machines using client software or web browsers.
- Thin clients: Lightweight, low-power devices designed specifically for VDI access.
- Zero clients: Minimalist hardware with no OS, relying entirely on the VDI server.
- Tablets: iPads, Android, and Windows tablets using VDI apps.
- Smartphones: iOS and Android phones (with some usability limits due to screen size).
- Web Browsers: HTML5-compatible browsers like Chrome or Edge, providing software-free access.
How much does VDI cost to set up?
The cost of implementing a Virtual Desktop Infrastructure (VDI) varies widely, from a few hundred to over two thousand dollars per user. The main variables impacting cost are:
- User headcount
- Deployment type (on-premises or cloud)
- Hardware and software
- Potential network upgrade
- Persistent vs. Non-persistent (customization and storage costs are higher for Persistent models)
Setup requires upfront expenditure on physical hardware, licensing, networks, and consulting. Ongoing costs include (possibly) dedicated staffing, maintenance, and subscription fees.
Is VDI right for my business?
VDI is ideal for organizations with remote or mobile workforces, strict security requirements, or high employee turnover, where quick desktop provisioning is essential. An IT assessment can help guide you to the best fit.
Is VDI good for small businesses?
VDI can be a good solution for small businesses. It’s especially compelling for smaller firms operating a remote or hybrid work model. Additional benefits include cost savings over the medium term, stronger security, greater flexibility, and scalability.
That said, VDI isn’t suitable for every small business because it brings added complexity, costs, and staffing requirements. It’s important to evaluate your needs and resources before committing to VDI.