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
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.
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 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, 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
Bare Metal Hypervisor / Native / Type 1 Products
VMware ESX Server
Hosted in an OS / Type 2 Products
Microsoft Virtual Server
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