Nt1330 Case 1.1

CASE 1
1. Explain the difference between the three types of server virtualization using the first video.

1) Virtualization: virtualization uses a special kind of software called a hypervisor. The hypervisor interacts directly with the physical server's CPU and disk space. It serves as a platform for the virtual servers' operating systems. The hypervisor keeps each virtual server completely independent and unaware of the other virtual servers running on the physical machine. Each guest server runs on its own OS -- even have one guest running on Linux and another on Windows. The hypervisor monitors the physical server's resources. As virtual servers run applications, the hypervisor relays resources from the physical machine to the appropriate virtual server. Hypervisors have their own processing needs, which mean that the physical server must reserve some processing power and resources to run the hypervisor application. This can impact overall server performance and slow down applications. 2) Para-virtualization: Para-virtualization approach is a little different. Unlike the full virtualization technique, the guest servers in a Para-virtualization system are aware of one another. A Para-virtualization hypervisor doesn't need as much processing power to manage the guest operating systems, because each OS is already aware of the
SANs are primarily used to make storage devices, such as disk arrays, tape libraries, and optical jukeboxes, accessible to servers so that the devices appear like locally attached devices to the operating system. A SAN typically has its own network of storage devices that are generally not accessible through the local area network by other devices. The cost and complexity of SANs dropped in the early 2000s to levels allowing wider adoption across both enterprise and small to medium sized business