Server Virtualization

Presentation Overview• What is Virtualization• Problem Assessment - Why Virtualization?• Server Virtualization• Typical Server Model• Virtualized Server Model• Hypervisor• Types of Hypervisor• Native Hypervisor (Type I)• Hosted Hypervisor (Type II)• Warnings about Hosted Hypervisor• Advantages of Virtualization• Marketplace Offerings

What is 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.”

Problem Assessment - Why Virtualization?

• Each physical hardware for each server

• High Cost• Power consumption• Down Time of a server• Machine Crashing• High Infrastructure• Less Utilization of

resource

Server Virtualization

• “Server virtualization in general terms lets you take a single physical device and install (and run simultaneously) two or more OS environments that are potentially different and have different identities, application stacks, and so on.”

Typical Server Model

Virtualized Server Model

Hypervisor

• Hypervisor or Virtual Machine Monitor (VMM) is a computing layer which allows multiple operating systems to run on a host computer at the same time.

• Originally developed in the

1970s as part of the IBM

Types Of Hypervisors

• Native Hypervisor (Type I)• Hosted Hypervisor (Type II)

Native Hypervisor (Type I)

• Able to install more than one OS in a virtual server

• Copy the OS from one virtual server to another easily

• Over allocation of memory than the available memory in physical server

Hosted Hypervisor (Type II)

Warnings about Hosted Hypervisor

• Here over allocation of memory is not possible

Advantages of Virtualization

• Zero downtime maintenance• Dynamic resource sharing• Low maintenance cost• Backups, and automated restoration

Market Place Offerings

Freely Available

• OpenVZ (Open Source)• VMWare Server (GSX)• Xen 3.0 (Open Source)

Commercial

• Virtuozzo• VMWare ESX• Xen Enterprise• Microsoft Virtual Server• Virtual Iron

Summary

• Virtualization offers major savings in data center operations

• Reductions in the costs of managing data centers

• Virtualization offers back-up and high availability services

• Cloud computing uses the virtualization as its main component