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CLOUD COMPUTING : GOOGLE FILE SYSTEM

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  GOOGLE FILE SYSTEM(GFS) v   The Google File System (GFS) was developed in the late 1990s. It uses thousands of storage systems built from inexpensive commodity components to provide petabytes of storage to a large user community with diverse needs. v   The main concern of the GFS designers was to ensure the reliability of a system exposed to hardware failures, system software errors, application errors, and last but not least, human errors. v   The system was designed after a careful analysis of the file characteristics and of the access models. Some of the most important aspects of this analysis reflected in the GFS design are: ü   Scalability and reliability are critical features of the system; they must be considered from the beginning rather than at some stage of the design. ü   The vast majority of files range in size from a few GB to hundreds of TB. ü   The most common operation is to append to an existing file; random write operations to a file are extremely infreq
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CLOUD COMPUTING-INTRODUCTION

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SYLLABUS:   SYSTEMS MODELING, CLUSTERING AND VIRTUALIZATION Scalable Computing over the Internet, Technologies for Network based systems, System models for Distributed and Cloud Computing, Software environments for distributed systems and clouds, Performance, Security And Energy Efficiency SCALABLE COMPUTING OVER THE INTERNET Ø   Over the past 60 years, computing technology has undergone a series of platform and environment changes. Ø   we assess evolutionary changes in machine architecture, operating system platform, network connectivity, and application workload. Ø   Instead of using a centralized computer to solve computational problems, a parallel and distributed computing system uses multiple computers to solve large-scale problems over the Internet. Thus, distributed computing becomes data-intensive and network-centric. The Age of Internet Computing: Ø   Billions of people use the Internet every day. As a result, supercomputer sites and large data centers m
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cloud computing : virtualization

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  VIRTUAL MACHINES AND VIRTUALIZATION OF CLUSTERS AND DATA CENTERS   Implementation Levels Of Virtualization: Ø   Virtualization is a computer architecture technology by which multiple virtual machines (VMs) are multiplexed in the same hardware machine. Ø   The purpose of a VM is to enhance resource sharing by many users and improve computer performance in terms of resource utilization and application flexibility. Ø   The idea is to separate the hardware from the software to yield better system efficiency. Ø   For example, computer users gained access to much enlarged memory space when the concept of virtual memory was introduced. Ø   Similarly, virtualization techniques can be applied to enhance the use of compute engines, networks, and storage.   Levels of Virtualization Implementation: A traditional computer runs with a host operating system specially tailored for its hardware architecture, as shown in Figure . After virtualization, different user applications ma
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