Linux Tactic

Maximizing Efficiency: Converting Physical Servers to Virtual Machines

Introduction to Virtualization

Virtualization is a technique that allows you to create virtual versions of physical resources like operating systems, hardware, or storage devices. By implementing virtualization, you can run multiple virtual machines on a single physical machine, which can reduce costs, improve scalability, and enhance the reliability of your infrastructure.

This article will provide an overview of virtualization and its different elements, including hardware fundamentals, hypervisors, types of virtual machines, and virtual machine files.

Hardware Fundamentals

Virtualization is possible due to the advances in hardware, which has led to processors that can handle complex tasks and higher storage capabilities. Some essential hardware components that are necessary for virtualization are power supply unit, motherboard, CPU, RAM, NIC, and storage.

The power supply unit is responsible for providing power to all the hardware components, while the motherboard provides the connections among all essential components like CPU, RAM, and storage. The CPU is the heart of the computer and is responsible for processing instructions and data.

It is also responsible for managing virtualization, which requires specialized instruction sets. Virtualization only works with CPUs that have these specialized instruction sets.

RAM is the temporary memory that the computer uses to store data while it’s being processed. When you create a virtual machine, the host system sets aside a portion of the RAM for that virtual machine.

Network interface cards (NICs) provide the connection to the network, and storage devices like hard drives and solid-state drives (SSDs) provides permanent storage for data.

Operating Systems and Hypervisors

Hypervisors and operating systems are both essential components of virtualization. An operating system is the software that controls all the resources on your computer, whereas a hypervisor also called a virtual machine manager, is a piece of software that controls and manages virtual machines.

There are two types of hypervisors: type 1 and type 2. A type 1 hypervisor runs directly on the host computer’s hardware and controls all the hardware resources.

A type 2 hypervisor runs like any other application on a host operating system.

Virtual Machine Files and Live State

Virtual machine files are at the heart of every virtual machine. Every virtual machine has several files that store information about virtual machine’s hardware configuration, virtual machine state, and virtual machine data.

The virtual machine configuration file contains all the information about the virtual machine’s hardware configuration, which includes CPU, RAM, and Network settings. It also includes the virtual disk’s location and size.

Virtual machine state includes information about the virtual machine’s current running state, including the running applications and services, the state of the virtual disk, the network configuration, and peripherals attached to the virtual machine. The persistent and live state is the data that the virtual machine is currently using and is stored in the virtual disk, RAM, and any peripherals that the virtual machine is using.

Snapshots can be used to create a state in time, and virtual disks can be easily moved to other physical hosts when moving the virtual machine.


In this article, we discussed the basics of virtualization. We learned that virtualization is a technique that allows you to create virtual versions of physical resources like operating systems, hardware, or storage devices.

We also dove into essential hardware components like power supply units, motherboards, CPUs, RAM, NICs, and storage devices. We also covered hypervisors and operating systems, which are responsible for managing resources like CPU, RAM, and storage.

Finally, we explored virtual machine files, including virtual machine state, persistent and live state, and snapshots. Implementing virtualization can transform your infrastructure into a more manageable, reliable, and scalable environment.

Essential Components of Virtualization

Virtualization has revolutionized the way we manage resources on our computer systems and servers. By creating virtualized versions of hardware, such as CPUs, memory, storage, and networks, we can achieve optimal usage of the resources we have available, reducing costs and increasing efficiency.

In this article, we will explore the essential components of virtualization, including CPU, memory, network, and storage virtualization.

CPU Virtualization

CPU virtualization allows virtual machines to utilize CPU resources of the host machine. It enables the creation of multiple virtual CPUs from the physical cores of the host machine.

Typically, the allocation of cores depends on the number of virtual machines running on the host machine. It is essential to right-size virtual machines to avoid CPU resources wastage.

Right-sizing virtual machines can help reduce CPU resource usage and achieve optimal virtualization. It involves periodically monitoring virtual machines to review their usage patterns and adjusting their allocation parameters to achieve a balanced CPU resource utilization.

Memory Virtualization

Virtualized memory can be allocated to virtual machines from the physical RAM of the host machine. The hypervisor manages memory allocation and monitoring to avoid resource wastage.

The hypervisor creates a memory table, which comprises memory slot entries and shows what portions of virtualized memory are in use and which are available. The hypervisor monitors memory usage, and when a virtual machine requires more memory, the hypervisor reserves the required amount of host memory for the virtual machine.

To achieve optimum performance, it is essential to configure memory correctly in the virtual environment. Configuring memory means balancing how much memory to allocate to each virtual machine, examining high-performing guest virtual machines to allocate more memory, and limiting resources to less active virtual machines.

Network Virtualization

Network virtualization creates virtual NICs (vNICs) that can be assigned to virtual machines to enable communication between virtual machines, and between virtual machines and physical machines on the network. Virtual switches can manage and direct traffic flow between virtual NICs.

Virtual LANs (VLANs) can also be created to segment network traffic.

A Physical switch manages the VLAN traffic between the physical and virtual environments. Mobility is another key benefit of network virtualization, which allows virtual machines to be moved between hosts with minimal disruption.

Live migration enables virtual machines to be moved from one host to another without downtime or loss of connections. Decoupling, one of the primary benefits, separates virtual machines from the physical and network infrastructures, providing improved mobility and management.

Storage Virtualization

The creation of a virtual SCSI controller and virtual disks with virtualization enables physical storage to be abstracted as virtual storage. This abstraction enables the hypervisor to manage storage commands and simplify the storage usage process.

The shared storage in storage virtualization enables multiple hosts to access the same storage resources, which enhances collaboration and resource sharing across hosts. Storage arrays can be utilized to improve the performance of virtual storage, and decoupling separates virtual storage from the physical storage to provide improved storage mobility and management.

Benefits of Virtualization

Virtualization offers a multitude of benefits. One of the key benefits is consolidation, which involves combining multiple workloads into fewer physical servers.

Consolidating reduces overhead costs of running multiple servers, thereby increasing efficiency. Efficiency maximizes hardware investment by reducing resource waste.

By utilizing all resources on a single physical machine, virtualization enables resizable resources to ensure resources are not left idle. Mobility is another key benefit of virtualization, which provides live migration and decoupling for improved mobility and management.

It enables dynamic resource allocation, reducing downtime required for maintenance, which leads to load balancing, where loads can be adjusted across multiple hosts. Automated load balancing helps ensure that virtual machines efficiently utilize the resources available.


Virtualization is an incredible technology that provides many benefits, including efficiency, improved mobility, and balanced resource utilization. With the proper virtualization components, you can create a virtualized environment that utilizes all resources, maximizing efficiency and reducing overhead costs.

By incorporating virtualization into your infrastructure, you can be sure to achieve optimal use of your resources and better manage your workloads.

Converting Physical Servers to VMs

Converting physical servers to virtual machines can be a useful technique when you need to optimize resource usage, enhance scalability, or reduce hardware costs. Physical to virtual (P2V) conversion requires software tools that can translate the physical hardware to virtual hardware and support mapping of the host operating system to a virtualized environment.

In this article, we explore the concepts, software options, and the conversion process associated with P2V conversions.

Concepts and Software Options

Before embarking on a P2V conversion process, it is essential to determine whether the hardware is compatible with virtualization software. Choosing the right hypervisor, which is a virtual machine monitor or software emulation layer, can make the process easier.

Common hypervisors include VMware, Oracle VirtualBox, and Microsoft Hyper-V. The Ubuntu operating system can be used to carry out P2V conversions using software tools like Clonezilla, which is a bootable CD that creates and restores image backups of data.

It is also possible to use the VMware Converter software, which is available for free and provides a straightforward wizard-driven interface for the conversion process. Compatibility issues related to drivers and physical hardware can arise when converting physical servers to virtual machines.

It is crucial to ensure that the virtualization software and hardware drivers available for the virtual machine are compatible with the physical hardware.

Converting Process

The P2V conversion process can involve several steps, depending on the software tools and hardware compatibility involved. The following are some common steps involved in a P2V conversion process:


Analysis: The first step in the process is an analysis of the physical server’s hardware and components, including CPUs, RAM, network adapters, and storage disks. 2.

Planning: After the analysis, it’s time to plan the conversion strategy, which includes choosing the appropriate hypervisor and virtualization software to best suit the hardware structure of the physical hardware. 3.

Installation: The next step involves installing the hypervisor and virtualization software on the destination server. It is here that the physical hardware is translated into virtual hardware.

4. Conversion: This step is where the hypervisor maps the host operating system and applications to the virtual hardware that was created and installed in the installation step.

This process also involves creating a virtual machine that can be used to host the converted server. 5.

Testing: Once the conversion is complete, it’s essential to test the virtual machine to ensure that all drivers and configuration settings are correct. It is possible to encounter several errors during the P2V conversion.

Proper testing should be done to catch these errors and eliminate them. In summary, the P2V conversion process involves the analysis of the physical server’s hardware and components, planning of the appropriate hypervisor and virtualization software, installation of the virtual machine on the destination server, conversion of the host operating system and applications to virtual hardware, and testing of the virtual machine for compatibility issues and errors.


Converting physical servers to virtual machines can have many benefits, including enhanced scalability, lower hardware costs, and improved resource usage. Hypervisors like VMware, Oracle VirtualBox, and Microsoft Hyper-V are available for use in the virtualization process.

When carrying out P2V conversions, it is important to conduct a thorough analysis of the physical server’s compatibility with the selected virtualization software and carry out proper planning and testing of the virtual environment. By following the outlined steps and recommendations, you can convert physical servers to virtual machines and gain the benefits of virtualization.

In conclusion, converting physical servers to virtual machines (P2V) is a valuable technique that can optimize resource utilization, enhance scalability, and reduce hardware costs. By utilizing software tools and compatible hypervisors, such as VMware or Oracle VirtualBox, the P2V conversion process becomes achievable.

Key steps include analyzing hardware compatibility, planning the conversion strategy, installing the appropriate hypervisor, mapping the host operating system to virtual hardware, and thorough testing. Virtualization offers numerous benefits, including increased efficiency, mobility, and resource consolidation.

By embracing P2V conversions, businesses can transform their infrastructure, improving their overall productivity and achieving cost-effective solutions in a dynamic digital landscape.

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