2. A Server is a computer program that provides services to other computer programs (and their users) in the same or other computers. Virtualization is a method of running multiple independent virtual operating systems on a single physical computer. It is a way of maximizing physical resources to maximize the investment in hardware. Introduction… Fig 1:A general server
4. Server virtualization is the masking of server resources, including the number and identity of individual physical servers, processors, and operating systems, from server users. Server Virtualization Fig 3: Virtual Server
7. Virtualization at the operating system (OS) layer. Approaches to Server Virtualization
8. A).The virtual machine model: Virtual machines are based on the host/guest paradigm. Each guest runs on a virtual imitation of the hardware layer. This approach allows the guest operating system to run without modifications. It's not running on real hardware. It uses a hypervisor to coordinate instructions to the CPU. The hypervisor is called a virtual machine monitor (VMM). VMware and Microsoft Virtual Server both use the virtual machine model.
10. The paravirtual machine (PVM) model is also based on the host/guest paradigm. The VMM actually modifies the guest operating system's code. This modification is called porting. Porting supports the VMM so it can utilize privileged systems calls sparingly. Xenand UML both use the paravirtual machine model. B).The paravirtual machine model:
12. Virtualization at the OS level works a little differently. It isn't based on the host/guest paradigm. In the OS level model, the host runs a single OS kernel as its core and exports operating system functionality to each of the guests. Virtuozzoand Solaris Zones both use OS-level virtualization. C).Virtualization at the operating system layer
13. Virtualization at the operating system (OS) layer Fig 6:Virtualization at the operating system (OS) layer
14. Server virtualization can be viewed as part of an overall virtualization trend in enterprise IT that includes storage virtualization, network virtualization, and workload management. Server virtualization can be used to eliminate server sprawl, to make more efficient use of server resources, to improve server availability, to assist in disaster recovery, testing and development, and to centralize server administration Scope of virtualization
15. Reduces administrative efforts Lowers operational costs Fewer servers to manage Speeds deployment Now 1-6 weeks (requisition, setup, software, test) Virtual reduces this to hours Reduced hardware and infrastructure costs Improves resource utilization Increases availability Tools to enhance security Virtualization Benefits
16. Server consolidation Multiple OS & application support Lab and deployment testing Training Help desk Disaster recovery Application isolation Intrusion detection Security Server Virtualization Scenarios
17. Fewer servers to manage and recover/restore Reduces costs Server VMs are hardware independent Can be restored to other platforms No need to match primary site and secondary site hardware VMs are encapsulated Faster Can be replicated between sites No need for bare-metal installs Disaster Recovery
18. Physical-to-VM recovery Restore physical backup to running VM Lower costs – no need for 1-to-1 physical servers VM-to-VM recovery Protects against operating system/application failure Recover failed VM on another server Disaster Recovery
19. Server Virtualization is the perfect solution for applications that are meant for small- to medium-scale usage .Munich - Fujitsu announced a new initiative aimed at helping small and mid-size businesses (SMBs) take advantage of the business-boosting benefits of switching to server virtualization. ‘My Very First Hyper-V’ combines hardware and software components to provide an affordable, easy-to-manage entry point to server virtualization, offering SMBs significantly-reduced fixed and operational costs, as well as increased system flexibility and availability. Implementation:
20. The future of virtualization is really about the future of the OS. Abstractly speaking, virtualization is just the latest development in the operating system's ongoing adaptation to different forms of multitenancy (protected memory and multiuser support being two earlier points on this trend). Future Scope
