What is virtualization and how to activate it step by step

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Virtualization has become a key component of any modern technology infrastructure. It's the foundation of the cloud, today's data centers, and many of the tools we use daily without even realizing it. However, despite its widespread use, it still raises many questions: what exactly is it, what is it used for, is it worthwhile for a small business, and how do you activate it on a standard PC?

In the following lines, we'll provide a comprehensive yet accessible overview of what virtualization is, how it works, and how to enable it on your computer. We'll also explore different types of virtualization (servers, network, data, applications, desktops), their advantages and disadvantages, and why it has become the standard in most organizations.

What is virtualization and why is it so important?

When we talk about virtualization, we're referring to a technology that allows a single physical computer (usually a server) to be divided into several independent virtual machines. Each of these virtual machines can have its own operating system (Windows, Linux, etc.) and its own allocated resources (memory, CPU, storage) as if it were a separate computer.

The interesting thing is that, from the inside, each virtual machine believes it's working in a dedicated environment , as if it had its own exclusive hardware. In reality, this isn't the case: it's sharing the same physical server with other virtual machines, but everything is managed through a software layer that transparently creates this illusion.

Thanks to this approach, instead of having many underutilized servers, we can concentrate several workloads on fewer physical machines , making much better use of the available power. This translates into space savings, energy savings , reduced hardware costs, and much more flexible management.

This concept isn't new: back in the 60s and 70s, IBM conducted the first tests of sharing computing resources among different users, precisely to improve efficiency. It wasn't until the late 90s and early 2000s, with the increasing IT needs and the rising cost of maintaining so much equipment, that virtualization took off and became the default model in data centers and businesses.

How virtualization works: hypervisor and virtual machines

To fully understand how virtualization works, a simple metaphor is helpful: imagine a huge hotel that's just one open space . If we leave it as is, we're wasting valuable square footage. The logical solution is to divide it into separate rooms, each with its own door, bed, and bathroom, but all sharing the same building.

In this example, the hotel building would be the physical server , while the rooms would be the different virtual machines. Each room has its own space and resources, but they all depend on the same building. In computing, when we virtualize, we take the physical hardware and logically divide it into several virtual machines that run simultaneously without interfering with each other.

For this magic to work, we need two fundamental elements: the virtual machine and the hypervisor . The virtual machine is, simply put, a computer created by software, with its own configuration of CPU, RAM, disk, and virtual devices. On top of it, we install a guest operating system (Windows, Linux, etc.) that behaves exactly like a physical PC: it needs licenses, updates, antivirus software, and is vulnerable to attacks if not properly protected.

The other key player is the hypervisor. This software component creates the virtualization layer that sits between the hardware and the virtual machines . Its job is to dynamically allocate physical resources among the different virtual machines, making each one "think" it has the hardware at its disposal. If a virtual machine needs more CPU or RAM at any given time, the hypervisor takes care of allocating it (if it's available).

For optimal performance, it's crucial that the hypervisor, storage, and network operate stably . A problem with a disk or network card on the physical server can impact all virtual machines using it. However, at a logical level, each virtual environment is isolated, and a failure within one virtual machine (such as malware or misconfiguration) shouldn't affect the others.

Something that's sometimes overlooked is security: since each guest operating system functions the same as one installed on a real computer , it also has the same vulnerabilities. That's why it's important to maintain measures such as antivirus software, updates, encryption, and good practices, unless the VM was specifically created for attack testing or laboratory purposes.

What is the purpose of virtualization in everyday life?

Beyond theory, virtualization has earned its place because it solves very specific problems in the day-to-day operations of businesses . One of the most common uses is the ability to run multiple logical servers on a single physical server, thus reducing the number of machines needed to deploy applications and services.

It is also extremely useful for testing operating systems or new versions without putting the production environment at risk, or even testing programs without getting infected using Windows Sandbox.

Another typical scenario is when there's a need to continue using legacy software that only runs on outdated operating systems . Instead of maintaining an old, vulnerable machine, the system is virtualized and runs on a modern server, encapsulating the risk and simplifying maintenance.

At the infrastructure level, virtualization allows you to maximize the capacity of your servers by optimizing the use of CPU, RAM, and storage. This reduces downtime, improves application response times, and makes it easier for your IT environment to grow or adapt smoothly.

For all these reasons, for many companies, large and small, virtualization has become one of the best investments in technology : it reduces the amount of hardware needed, provides service encapsulation, improves isolation between environments, and gives enormous independence in choosing providers and architectures.

Types of virtualization: beyond virtual machines

Although virtualization is often associated only with running virtual machines on a server, the reality is that virtually any IT building block can be virtualized . This includes servers, storage, networks, data, applications, and even complete desktops for end users.

According to the definition of analysis firms like Gartner, virtualization is the abstraction of IT resources that hides their physical nature from users. From this perspective, what we do is present a logical resource (a server, a disk, a virtual network, etc.) while hiding the complexity of the underlying hardware, something that fits very well with current cloud models.

Historical evolution also reveals another important idea: virtualization has drastically reduced the cost of accessing computing power . Today's servers are so powerful that, without virtualization, many workloads would leave a significant portion of that power unused. By grouping services into virtual machines, we maximize hardware efficiency and reduce costs.

We will now break down the main virtualization variants used in practice, seeing what each one is for and what it contributes within a modern architecture.

Server virtualization

Server virtualization is probably the best-known type. It involves dividing a physical server into several virtual servers , each with its own operating system and applications. Without this technology, many physical servers would have a large portion of their processing capacity unused , as they would only run a very specific application or service. By consolidating several logical servers onto one physical server, efficiency is increased, the number of machines is reduced, administration is simplified, and energy and space costs are lowered.

Storage virtualization

In the case of storage, the idea is to combine and abstract various physical data devices , such as SAN arrays, NAS systems, or local disks, into a large pool of virtual storage. Although the underlying hardware may come from different vendors and use different technologies, administrators perceive it as a single logical unit managed by software.

Thanks to this, it's much easier to optimize tasks like backups, archiving, and recovery , since you're working with that unified set of capabilities. You can also move information between different physical devices without the applications being aware of the change, providing flexibility and service continuity.

Network virtualization

Corporate networks typically consist of a rather heterogeneous mix of switches, routers, firewalls, and other devices spread across multiple locations. Managing all of this by manually accessing each piece of physical equipment is complex and not very scalable, especially in companies with many locations.

Network virtualization groups and abstracts network resources so they can be managed centrally by software. This allows administrators to define policies, routes, segmentation, and security rules without having to manually modify each physical device, simplifying network operation.

Within network virtualization, two approaches stand out. On the one hand, there are software-defined networks (SDN), where traffic routing control is detached from physical devices and managed at a higher logical level. This allows, for example, prioritizing video call traffic over other applications to ensure stable quality in online meetings.

On the other hand, we have network functions virtualization (NFV). This involves virtualizing functions that previously depended on specific devices , such as firewalls, load balancers, or traffic analyzers. This allows us to deploy, move, or scale these functions as if they were software services, without purchasing a dedicated physical device for each one.

Data virtualization

Most modern organizations handle data from multiple sources, in different formats, and located in various places : on-premises databases, cloud systems, SaaS applications, flat files, etc. Integrating all that information and making it available to applications is no easy task.

Data virtualization introduces a software layer between data sources and consuming applications . When an application requests information, the virtualization layer locates it on the relevant systems, transforms it, and returns it in the appropriate format, without the application needing to know the details of where it is actually stored.

This approach allows for greater flexibility in data integration , facilitates analysis projects that combine information from different areas, and reduces the time needed to launch new reports or dashboards, because it avoids constantly replicating data between systems.

Application virtualization

In the realm of applications, virtualization aims to allow the same program to run on operating systems for which it was not originally designed , or to do so without the need for traditional installation on each user's computer. This offers significant convenience in large-scale deployments.

There are several ways to achieve this. One is application streaming , where the application runs from a remote server and only the necessary data is sent to the user's machine at any given time. Another possibility is server-based application virtualization, where users access the application through a browser or thin client, without local installation.

There is also local application virtualization, which involves packaging the code along with its own isolated environment , so that it can run on different operating systems without depending on the libraries installed on the computer. In all cases, the goal is to simplify management, reduce compatibility issues, and make it easier for users to have the tools they need without headaches.

Desktop Virtualization

In many companies, there are non-technical user profiles that simply need a desktop with certain standard applications (office suites, CRM, sales tools, etc.). Managing hundreds of physical PCs with different versions of Windows can be a major headache for support.

Desktop virtualization allows you to run different desktop operating systems as virtual machines that users connect to remotely. This way, instead of relying on local hardware, the desktop "lives" on a central server and is managed from there, saving costs and increasing security.

Within this context, virtual desktop infrastructure (VDI) runs complete desktops on a remote server , while users access them with client devices (thin clients, basic PCs, tablets, etc.). Another variant is local desktop virtualization, in which the hypervisor runs directly on the user's machine, and the user can switch between their main operating system and an additional virtual desktop as easily as switching between applications.

Advantages of virtualization in an organization

The list of benefits offered by virtualization is long, which is why it's often said that no recent IT advancement has offered so many quantifiable advantages . The first major benefit is the reduction of risks and costs: a single, well-sized physical server can host many virtual servers, thus reducing the amount of hardware required, the space it occupies, and energy consumption.

Furthermore, virtualization facilitates the monitoring and control of workloads . Administrators can see in real time how each virtual machine is behaving, what resources it is consuming, and whether there are any bottlenecks. This visibility helps anticipate problems, plan for expansions, and keep performance under control.

Another highly valued feature is the popular "live migration" of virtual machines. This capability allows you to move a virtual machine from one physical server to another without interrupting service , something unthinkable in a purely physical environment. This simplifies tasks such as hardware maintenance, firmware updates, and load balancing without disrupting users.

Backups and cloning also benefit. With systems encapsulated in virtual machines, backing up or cloning a server is much faster and easier. In the event of a disaster or serious failure, a VM can be restored quickly, minimizing the impact on the business.

In addition to all of the above, there is also reduced energy consumption , since where several permanently running devices were previously needed, everything can now be concentrated on fewer, more powerful servers. In large organizations, the savings in electricity and cooling are very significant and contribute to sustainability strategies.

Virtualization is also a great asset in disaster recovery plans. It's possible to maintain replicas or images of virtual machines in other data centers or in the cloud, ready to be deployed if something goes wrong. Even before a critical upgrade, complete system snapshots can be taken to revert to a previous state if a problem arises.

From an administrative perspective, working with virtual servers makes management much simpler and more centralized , especially in environments with Linux system administration . Updating, deploying applications, applying security patches, or modifying configurations can be done in an orchestrated and, in many cases, automated way, freeing the IT team from repetitive tasks.

The isolation provided by virtual environments also offers an extra layer of security. A failure or infection in one virtual machine doesn't necessarily have to affect the rest or the main server, as long as the environment is properly segmented. This allows for the creation of more controlled zones for testing, development, or access from outside the organization.

Finally, it's worth highlighting the ability to allocate or scale resources at high speed . If an application runs short on RAM or CPU, more can be allocated from the hypervisor without physically replacing components. And with fewer hardware components that can fail, maintenance is reduced and overall reliability is improved.

Disadvantages and challenges of virtualization

Despite all its advantages, virtualization isn't perfect. One of its biggest challenges is that the physical machine hosting the virtual machines becomes a critical element . If that server fails due to a hardware failure, all the VMs it hosts will be affected, making it vital to invest in redundancy and high-availability best practices.

It's also important to remember that the performance of a virtual machine is usually somewhat lower than that of a dedicated physical server , especially in very demanding environments or those with very intensive I/O loads. Although the difference has been greatly reduced thanks to the power of modern servers, it remains a factor to consider in projects that are highly sensitive to latency.

Another challenge, especially for small businesses, is the initial investment in licenses and suitable hardware , and the need to configure PC components correctly. Setting up a serious virtualization platform requires servers with ample RAM, good storage, and, in many cases, paid software or subscriptions. Without proper planning, there's a risk of running out of resources or quickly becoming overloaded.

Furthermore, some software vendors tie their licenses to the number of virtual machines or CPU usage , which can increase the cost of certain deployments. It's advisable to carefully review the licensing terms before moving applications to virtualized environments to avoid unexpected bills.

Proper planning is another key point: if you don't accurately calculate how many virtual servers you need, what resources they will consume, and how the environment will grow, you can end up with overloaded servers , directly impacting performance. A poor platform design creates more problems than it solves.

Finally, virtualization requires administrators to be trained in new tools and concepts . This can be seen as a positive investment in knowledge, but it also requires time and effort, which are sometimes scarce. Some platforms have a considerable learning curve, so it's worth keeping this in mind when planning for adoption.

How to enable virtualization in the BIOS or UEFI

To take advantage of many of these technologies at the user level or in lab environments, it is essential to enable virtualization features in the computer's hardware. In Intel processors, this is usually called Intel VT-x or Intel Virtualization Technology, while in AMD it is known as AMD-V.

To activate these options, you need to access your computer's firmware interface, whether it's the classic BIOS or the modern UEFI . The appearance of this menu depends entirely on the computer or motherboard manufacturer: some use highly graphical interfaces, while others still have more basic screens, but the general concept is the same. If you need a step-by-step guide, see how to configure the BIOS or UEFI.

To access it, you usually need to press a specific key right when you turn on your PC , before the operating system starts. The most common keys are Delete, F2, F10, F12, or Esc, depending on the model. In many cases, a message like "Press F2 to enter Setup" or similar appears on the initial screen, indicating the correct key.

Once inside the BIOS or UEFI, you'll need to look for a section related to CPU, Advanced, Security, or similar , where the virtualization options are usually located. The names may vary (Intel VT-x, Intel Virtualization Technology, SVM, AMD-V…), but in all cases, it involves enabling these functions so that the hypervisor can use them.

Many manufacturers offer specific guides on their websites explaining exactly where the virtualization option is located on their models. If your brand isn't listed in the usual guides or you're using a motherboard with developer firmware like AMI or Phoenix, it's best to consult the official documentation for your device or the corresponding BIOS/UEFI.

After enabling virtualization and saving the changes, the computer will restart automatically . From there, you can install virtualization software (VirtualBox, Hyper-V, VMware, etc.) and create virtual machines that take advantage of these hardware capabilities to offer better performance and greater stability.

As an important detail, keep in mind that the options and menus vary considerably between manufacturers . If you can't find the right settings, it's a good idea to check your motherboard or laptop manual, or search for your specific model on the manufacturer's support website, as each one places these functions in slightly different sections.

Given all of the above, it's clear why virtualization is at the heart of today's technological landscape: it enables a shift from rigid physical resources to flexible virtual resources , facilitates scalability, reduces costs, improves business continuity, and paves the way for more collaborative and interoperable architectures. Provided it's well-planned, the team is properly trained, and the impact on critical hardware is clearly understood, virtualization offers more advantages than disadvantages and becomes a fundamental ally in digital transformation.