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    ContentsI. Cloud Computing ................................................................................................................................. 2

    1. General information ....................................................................................................................... 2

    1.1 Introduction .............................................................................................................................. 2

    1.2 History ....................................................................................................................................... 2

    1.3 Definition................................................................................................................................... 3

    2. Model .............................................................................................................................................. 4

    2.1 Infrastructure as a service: ........................................................................................................ 4

    2.2 Platform as a service: ................................................................................................................ 5

    2.3 Software as a service: ............................................................................................................... 5

    3. How cloud computing works? ......................................................................................................... 6

    4. Advantages & Disadvantages of Cloud computing ......................................................................... 7

    4.1 Advantages: ............................................................................................................................... 7

    4.2 Disadvantages ........................................................................................................................... 8

    5. Cloud Computing in Vietnam .......................................................................................................... 8

    II. MISA HRM.NET.................................................................................................................................... 9

    1. Introduction .................................................................................................................................... 9

    1.1 About the company................................................................................................................... 9

    1.2 About MISA HRM.NET ............................................................................................................... 9

    2. Why choose MISA HRM.NET? ......................................................................................................... 9

    3. Applying Cloud computing ............................................................................................................ 10

    4. Functions ....................................................................................................................................... 11

    5. Utilities .......................................................................................................................................... 12

    References ............................................................................................................................................ 13

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    I. Cloud Computing

    1. General information

    1.1 Introduction

    Today, for all companies, controlling the data of themselves, customers and partners

    effectively is one of the important and difficult problems. To be able to manage data sources,

    they need to calculate a wide variety of costs such as the cost of software, network,

    administrative costs, maintenance costsThey also need to upgrade equipment, control the

    data security as well as the availability of data.

    We see that if there is a reliable place to help businesses manage data sources, businesses will

    no longer be interested in infrastructure, technology so that they just mainly focus on their

    business. This will help them to increase productivity and profits.

    So Cloud- computing was derived from that situation to satisfy the need of all businesses.

    1.2 History

    The words cloud computing has been used since 1980s as the evolution of grid computing,

    utility computing and software as a service. Grid computing is the federation of computer

    resources from multiple administrative domains to reach a common goal. The grid can be

    thought of as a distributed system with non-interactive workloads that involve a large number

    of files. While Utility computing is the packaging of computing resources, such as

    computation, storage and services, as a metered service. This model has the advantage of a

    low or no initial cost to acquire computer resources; instead, computational resources are

    essentially rented.

    After the dot-com bubble, Amazon led the way in the development of cloud computing by

    modernizing their data centers, which, like most computer networks, were using as little as

    10% of their capacity at any one time, just to leave room for occasional spikes. Having found

    that the new cloud architecture resulted in significant internal efficiency improvements

    whereby small, fast-moving "two-pizza teams" could add new features faster and more easily,

    Amazon initiated a new product development effort to provide cloud computing to external

    customers, and launched Amazon Web Service (AWS) on a utility computing basis in 2006.

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    In 2008, OpenNebula became the first open-source software for deploying private and hybrid

    clouds and for the federation of clouds. In the same year, a real-time cloud environment was

    created as the result of providing quality of service guarantees to cloud infrastructure. After

    that, cloud computing opened new opportunity to to shape the relationship among

    consumers of IT services, those who use IT services and those who sell them". It created a

    trend of switching from company-owned hardware and software assets to per-use service-

    based models. On March 1, 2011, the Smarter Computing framework, which is based on

    cloud computing, was announced by IBM to support Smarter Planet. It is a successful

    example of applying cloud computing.

    Currently, Could Computing is redefined as a virtualized, semantic source of information:

    "Cloud computing is a universal collection of data which extends over the internet in the form

    of resources and forms individual units within the virtualization environment. Held together

    by infrastructure providers, service providers and the consumer, then it is semantically

    accessed by various users.

    1.3 Definition

    Cloud computing is the use of computing resources that are delivered as a service over a

    network. The resources mentioned here include from hardware to software, infrastructurelayer to the entire solution. And the network in cloud computing typically is the internet

    which can available for only private purposes or worldwide. In other words, CC is a general

    term for anything that involves delivering hosted services over this network. The name cloud

    computing was inspired by the cloud symbol that's often used to represent the Internet

    inflowchartsand diagrams.

    A cloud service has three distinct characteristics that differentiate it from traditional hosting.

    It is sold on demand, mostly for the using time; it is elastic -- a user can have as much or as

    little of a service as they want at any given time; and the service is fully managed by the

    provider (the consumer needs nothing but a personal computer and Internet access).

    Cloud computing entrusts remote services with a user's data, software and computation. It

    means users will no longer take part in complicated technical fields. Certainly, users would

    not need to know or care about how the computers, their software, or the network functioned.

    In more specific situations, this technology can provide users three types of service which

    http://whatis.techtarget.com/definition/flowcharthttp://whatis.techtarget.com/definition/flowchart
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    will be described latter: Infrastructure as a service (IaaS), platform as a service (PaaS) and

    software as a service (SaaS).

    2. Model

    Cloud computing providers offer users three fundamental models: infrastructure as a service

    (IaaS), platform as a service (PaaS) and software as a service (SaaS). IaaS is the most basic

    one and each of following levels will consist of sublevel characteristics plus new features.

    2.1 Infrastructure as a service:

    The first basic level is infrastructure as a service, or IaaS. Via this model, cloud providers

    offer computers, as physical or more often as virtual machines, and other resources. The

    virtualization technology is used to provide multi-tenancy and isolation to the users as

    different virtual instances may be allocated to a single physical machine. The virtual

    machines will be run as guest by a hypervisor (a hardware virtualization techniques allowing

    multiple operating systems, termed guests, to run concurrently on a host computer) In the

    other words, Infrastructure as a Service is a provision model in which an organization

    outsources the equipment used to support operations, including storage, hardwa

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