Cloud Computing

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Cloud Instance

  • A cloud instance is a location of physical memory on a cloud server which has been allocated to a particular client. It is a block of memory which acts as a virtual server for that client.
  • It has it's own allocation of processing power, storage and other components
  • Each server will use multiple clients 
  • Ability to allocate additional capacity to clients when their usage spikes and resource demands increase.
  • If end user wants to access a particular application or service they create an instance in the cloud for the duration of time they are using that application. 
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What is meant by Cloud Computing?

  • Refers to the use of the internet by large computing companies to provide services normally provided by a LAN. 
  • Companies supporting cloud computing servces normally do so through the use of server farms
  • These host the services they provide for other organisations who can access these services from any suitable computer with an internet connection.
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Virtual Servers:

  • Form the foundation of cloud platforms
  • Process of virtualisation allows "virtual servers" to run on a physical server platform
  • Virtualisation software seperates the physical infrastructures to create dedicated resources, making it possible to run multiple operating systems and applications on the same server at any time.
  • Virtualisation is software that manipulates the hardware used to provide cloud computing as a service to  the client users
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Hosted solution

  • With a hosted solution, any hardware and software made available to the client is reserved for the servicing of that individiaul clients needs.
  • One client pays for all the resources made available to them regardless of wether they are used or not.
  • Where the clients usage exceeds the capacity allowed to them they must make additional investment in resources.
  • Clusters of dedicated hardware will be hosted at each data center and used to provide specialised services and processes for clients.
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Cloud Computing Services:

  • Data Storage - cloud storage refers to saving data on an off-site storage system provided by a third party party
  • Email - web based services such as Yahoo allow users to access their email from the cloud using any browser or hardware platform with access to an internet connection.
  • Virtualised software - Many applications are now available to users via the web. Popular applications such as financial apps and traditional desktop software such as MS Office have moved in part to the web. Software is available without the need for installation and updates are immediately made available to the user
  • Remotely hosted applications - Allow clients to access their business applications from anywhere in the world where they have access to technology and an internet connection. The relevant software can be stored on a remote server, accessed as an instance from any location using virtual desktops.
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Benefits of Cloud Computing:

  • Providers can react more quickly to changes in user requirements
  • Collaboration using a wide range of devices from a wide range of locations can be supported
  • Reduced costs as the client does not have to consider the expense of purchasing and configuring hardware and software to help them meet their business needs. 
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Drawbacks of Cloud Computing:

  • You trust someone else to look after your data and supporting applications as the service provider takes responsibility for performing all updates, backups, restorations and the management of security.
  • Cyber attacks are problematic where large amounts of data are stored by a wide range of users, often on the same cloud system.
  • Legal liability remains an issue for organisations who rely on cloud based services with concerns over who becomes liable after a data breach.
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