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The National Institute of Standards and Technology define Cloud Computing as "A model for enabling convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction". In terms of Infrastructure as a Service (IaaS), the three main Open Source technologies are provided by Eucalyptus, OpenNebula and Nimbus. There are numerous challenges to tracking usage on cloud facilities, as have been covered in a suite of reports from JISC on using the cloud for research.
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