Virtualization

Virtualization is the creation of a virtual (rather than actual) version of something, such as

an operating system, a server, a storage device or network resources.

The benefits of virtualization
*Reduce the number of physical servers
*Reduce the infrastructure needed for your data center (power, cooling, battery backup, network

switch ports, KVM ports and space)
*Reduce administrative overhead because servers can be administered from a single console
*Ability to bring up new servers quickly (it could take days or weeks to put in a new physical

server but it could take just a few minutes to create a new virtual server from a template)
*Hardware Independence of virtual servers – a virtual server can run on any host server,

regardless of the host hardware
*Because of hardware independence, you receive reduce your disaster recovery cost, complexity,

and recovery time
*A “greener” datacenter & server environment due to the consolidation
Overall, lower TCO of servers

Virtual Machines
It is  emulator that executes programs like as physical machine.This provides a complete system

platform which supports the execution of a complete operating system.

Virtual server

Using virtulization technology a server will be performed as a multiple other systems running in

side it.This individual virtual servers are mostly isolated from each other and may run their

own full-fledged operating system which can be independently rebooted as a virtual instance.
In virtual server kernal runs on the hosted server is also called type 2 Hypervisor

Hypervisor
Hypervisor as the kernel or the core of a virtualization platform.The Hypervisor is also called

the Virtual Machine Monitor. The Hypervisor has access to the physical host hardware.
A Type 1 Hypervisor runs on the bare metal of the hardware.

Hyper-V
Hyper-V, it is a hypervisor-based(Type 1) Windows Server virtualization platform that is

included as a role of Windows Server 2008. Hyper-V enables you to consolidate workloads onto a

single physical server using a broad range of services ranging from resource-intensive services

like Microsoft SQL Server to third-party applications that may run on previous versions of

Windows or Linux.

Host and guest
A host system (host operating system) would be the primary & first installed operating system.

If you are using a bare metal Virtualization platform like Hyper-V or ESX, there really isn’t a

host operating system besides the Hypervisor. If you are using a Type-2 Hypervisor like VMware

Server or Virtual Server, the host operating system is whatever operating system those

applications are installed into.

A guest system (guest operating system) is a virtual guest or virtual machine (VM) that is

installed under the host operating system. The guests are the VMs that you run in your

virtualization platform.

Bare Metal Hypervisor / Native / Type 1 Products
VMware ESX Server
Microsoft Hyper-V
Citrix/Xen Server

Hosted in an OS / Type 2 Products
VMware Server
Microsoft Virtual Server
Parallels Server

Other related Blogs
https://teckadmin.wordpress.com/2013/11/23/installation-of-virtual-servers/
https://teckadmin.wordpress.com/2013/11/23/colinux-another-virtual-tool/
https://teckadmin.wordpress.com/2013/11/23/oracle-virtualbox/

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Posted on February 8, 2014, in Cloud. Bookmark the permalink. Leave a comment.

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