Server Virtulization and Network Virtulization in Cloud Computing

Abstract

Data Centers of today are rapidly moving towards the use of server virtualization as a preferred way of sharing pool of server hardware resources between multiple gust domains that hosts different applications. Due to trends like Cloud Computing and Green IT, virtualization technologies are gaining increasing importance. They promise energy and cost savings by sharing physical resources, thus making resource usage more efficient. However, resource sharing and other factors have direct effects on system performance, which are not yet well-understood. Hence, performance prediction and performance management of services deployed in virtualized environments like public and private Clouds is a challenging task. One benefit of virtual machines in these environments is the ability to multiplex several operating systems on the hardware based on dynamically changing system characteristics. However such multiplexing can be done while observing per VM performance guarantees.