How Virtualization helps your Business!

What is Virtualization and how it helps?

In computing, virtualization means the act of creating a virtual version of something, including virtual hardware platforms, operating systems, and computer network resources. It began in the 1960s, as a method of logically dividing the system resources provided by mainframe computers between different applications. Later, it was broadened.

Hardware virtualization or platform virtualization refers to the creation of a virtual machine that acts like a real computer with an operating system with its own resources. Softwares executed on these virtual machines are separated from the underlying hardware resources. For example, a computer running Microsoft Windows may host a virtual machine with other operating systems like Centos. Nowadays hardware components also help to maximize the efficiency of virtualization. Intel provides CPUs that support virtualization in hardware. They are called Intel® VT.

One of the best advantages of virtualization is that it's cost efficient. You can easily host several operating systems on a single server. Any security concern you may have are also covered as the can have a separated virtual machine for a single application without it affecting either your database or web application server.

The key benefits of Virtualization are Partitioning (running multiple operating systems and providing divided system resources), Isolation (Preserving performance through resource control and fault/security isolation at the hardware level), Encapsulation (Saving an entire state of the virtual machine to files and easy migration).


VMware ESXi is the industry-leading, purpose-built bare-metal hypervisor. ESXi installs directly onto your physical server enabling it to be partitioned into multiple logical servers referred to as virtual machines. The ESXi bare-metal hypervisor’s management functionality is built into the VMkernel, reducing the footprint to 150 MB. This gives it a very small attack surface for malware and over-the-network threats, improving reliability and security. For more information, you can visit VMWare website.


OpenVZ (Open Virtuozzo) is an operating system-level virtualization technology for Linux. It allows a physical server to run multiple isolated operating system instances, called containers, virtual private servers (VPSs), or virtual environments (VEs.) While virtualization technologies like VMware and Xen provide full virtualization and can run multiple operating systems and different kernel versions, OpenVZ uses a single patched Linux kernel and therefore can run only Linux. All OpenVZ containers share the same architecture and kernel version. This can be a disadvantage in situations where guests require different kernel versions than that of the host. However, as it does not have the overhead of a true hypervisor, it is very fast and efficient.


KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko. Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc. KVM is open source software. The kernel component of KVM is included in mainline Linux, as of 2.6.20. The userspace component of KVM is included in mainline QEMU, as of 1.3.


Citrix XenServer is a leading virtualization management platform optimized for application, desktop and server virtualization infrastructures. Consolidation and containment of workloads on XenServer enables organizations of any vertical or size to transform their business IT computer infrastructures. Comprehensive server consolidation and containment with XenServer also allows for significant performance and capacity gains in CPU cores, host RAM, VM RAM and virtual disks per VM, as well as integration with Microsoft Windows Update Services for automatic Windows VM driver updates.


Xen is a hypervisor using a microkernel design, providing services that allow multiple computer operating systems to execute on the same computer hardware concurrently. Xen runs in a more privileged CPU state than any other software on the machine. Xen supports five different approaches to running the guest operating system: HVM (hardware virtual machine), HVM with PV drivers, PVHVM (HVM with PVHVM drivers), PVH (PV in an HVM container) and PV (paravirtualization). Xen can scale to 4095 physical CPUs, 256 VCPUs per HVM guest, 512 VCPUs per PV guest, 16 TB of RAM per host, and up to 1 TB of RAM per HVM guest or 512 GB of RAM per PV guest.


Microsoft Hyper-V is a server virtualization product developed by Microsoft Corporation, which provides virtualization services through hypervisor-based emulations. Hyper-V is a key addition to Microsoft's cloud computing and virtualization product offerings and provides the complete end-to-end functionality for an enterprise-grade virtualization product. Hyper-V operates both as a standalone solution and as an addition to Windows Server 2008 R2.

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