One of the functions of the operating system is to ensure that the computer's memory or storage space is efficiently and effectively controlled and managed by the system's memory management unit (MMU). There are two categories of memory that are recognized by the computer. Primary memory, which is also referred to as the random access memory (RAM) is responsible for holding data and other program elements that are necessary for programs to execute in the CPU. Keywords: main memory; memory deduplication; cloud computing; virtualization; performance 1. Introduction Cloud computing has become a popular computational technique in both industry and academia for reducing the cost of ownership and management of computational hardware while increasing the flexibility and on demand scalability of such resources [1]. Question: 7 The following description of cloud computing is correct A. Cloud computing is a technology that enables IT resources to be obtained anytime, anywhere, conveniently, and on demand B. Various IT resources in cloud computing need to be paid to use C. IT resources obtained in cloud computing need to be used through the network D. In the process of obtaining IT resources, users need to CloudCache supports on-demand cache management based on a typical flash caching architecture illustrated in Figure 1. The VM hosts share a network storage for storing the VM disks, accessed through SAN or IP SAN [20, 5]. Every host employs a flash cache, shared by the local VMs, and every VM's access to its remote disk goes through this cache. 1) Hardware Virtualization: When the virtual machine software or virtual machine manager (VMM) is directly installed on the hardware system is known as hardware virtualization. The main job of hypervisor is to control and monitoring the processor, memory and other hardware resources. Cloud Computing Challenge 3: Lack of Resources/Expertise. Lack of resources and expertise ranked just behind security and cost management among the top cloud implementation challenges in the RightScale survey. Nearly three-quarters (73 percent) of respondent listed it as a challenge with 27 percent saying it was a significant challenge. • Step 5: Manage and monitor your cloud and manage with data - Use analytics to improve operations. Step 1: Develop a Cloud Strategy A cloud strategy clearly articulates the benefits, approach, and expected outcomes for your technology investment across your organization. Tied to line-of-business goals, it helps you get senior Wikipedia says "Virtualization, in computing, is the creation of a virtual (rather than actual) version of something, such as a hardware platform, operating system, a storage device or network resources" Concept is not new. Multi Programming - Each Process thinks it has complete control on all of the resources. Virtual Memory CPU Sharing Memory management in a virtualized environment is more challenging, since virtualization decouples the under- lying physical hardware from the guest operating system that runs in the virtual machine. No longer does the operating system have a detailed view of the hardware and the power state of all system memory. Cloud computing is a paradigm of distributed computing to provide the customers on-demand, utility based computing services. Cloud users can provide more reli- able, available and updated services to their clients in turn. Cloud itself cons