The Cloud

The origin of the term cloud computing is unclear. The expression cloud is commonly used in science to describe a large agglomeration of objects that visually appear from a distance as a cloud and describes any set of things whose details are not inspected further in a given context. Another explanation is that the old programs draw network schematics surrounded the icons for servers with a circle, and a cluster of servers in a network diagram had several overlapping circles, which resembled a cloud.

Users routinely face difficult business problems. Cloud computing adopts concepts  from Service-oriented Architecture (SOA) that can help the user break these  problems into services that can be integrated to provide a solution. Cloud  computing provides all of its resources as services, and makes use of the well- established standards and best practices gained in the domain of SOA to allow  global and easy access to cloud services in a standardized way.

Cloud computing also leverages concepts from utility computing to provide metrics  for the services used. Such metrics are at the core of the public cloud pay-per- use models. In addition, measured services are an essential part of the feedback  loop in autonomic computing, allowing services to scale on-demand and to perform  automatic failure recovery.

Cloud computing exhibits the following key characteristics:

  • Cost benefit 
  • Hardware and location independence 
  • Central Maintenance 
  • Performance 
  • Security 
  • Scalability 

 

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