Case1

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. ) 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 demands the other operating systems are placing on the physical server. The entire system works together as a cohesive unit. 3) OS-level virtualization: OS-level virtualization approach doesn’t use a hypervisor at all.
Instead, the virtualization capability is part of the host OS, which performs all the functions of a fully virtualized hypervisor. The biggest limitation of this approach is that all the guest servers must run the same OS. Each virtual server remains independent from all the others, but you can’t mix and match operating systems among them. Because all the guest operating systems must be the same, this is called a homogeneous environment. 2. Why is virtualization important to a company like Hudson’s Bay Company? How did that factor into their decision to partner with IBM?

For this company, they have lots of contact directly with their customer that they need to have great efficiency to serve their customer and did a right statistic and accurate record to establish their information system to see how to make them better. Virtualization can help them realize the capacity, delivered as promise and decline the timing when they are planning. For example, they want to create an image that once might take an hour, but after, it takes only in minutes. It helps them save time that adds more efficiency for them.
About their decision to partner with IBM, IBM led to industry that they believe it will be an innovation and useful for their company operating to cooperate with them and it will also benefit in both of them. 3. What kind of companies are likely to use a storage area network (SAN)? The company which has massive information to flow in and out will likely to use SAN that’s because it will protect the information from the suddenly down of computer, and company still can use the information they want on the Cloud. A storage area network (SAN) is a dedicated network that provides access to consolidated, block level data storage.
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 environments. A SAN does not provide file abstraction, only block-level operations.
However, file systems built on top of SANs do provide file-level access, and are known as SAN file systems or shared disk file systems. 4. Can you think of any risks involved in virtualization? Although, virtualization emphasize the efficiency of minimize the risk that they enhance the security by centralized IT management, easily update service packs& patches and easily restore servers. Once, it was really damage and lost any control, it might be totally break down, because such as all of the desktop are manage by one central sever.
If the information are hike it once, it would happened at the same way because centralize all the things in one place, and it would be the risk that we have think about it. 5. Explain why virtualization is considered a “green” technology. Virtualization can improve the percentage of resources using, increase the flexibility of IT, decrease the system’s operation time, help to cut down the human resources to manage and achieve the function of environment protecting of saving energy and reduce carbon dioxide.
Green technology, also called environment technology, is an application of environment science to sustain the natural environment and to reduce the negative effects from human activities. Sustainable development is the core goal of green technology. Because virtualization let many companies to reduce the wasting of hardware and the environment impact from those companies. So we think virtualization is such a kind of green technology.