Question

NIST的云计算定义

Answer 1

　　NIST(National Institute of Standards and Technology，美国国家标准和技术研究院).
　　在总结了各种云计算定义和描述的基础上，NIST的Peter Mell 和Tim Grance在2009年4月(到2009年10月已是第15.0版)提出了一个云计算的定义，这可能是目前唯一一个得到广泛认同和支持的定义。
　　定义的英文原文(Version 15)如下： Cloud computing is 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. This cloud model promotes availability and is composed of five essential characteristics, three service models, and four deployment models.
　　中文翻译(意译)：云计算是一种能够通过网络以便利的、按需付费的方式获取计算资源(包括网络、服务器、存储、应用和服务等)并提高其可用性的模式，这些资源来自一个共享的、可配置的资源池，并能够以最省力和无人干预的方式获取和释放。这种模式具有5个关键功能，还包括3种服务模式和4种部署方式。
　　
　　有12种技术是云计算的基础或是云计算得以成为它现在达到的状态的使能技术或推动力量：虚拟化;分布式计算;自治系统技术(Autonomic Systems);网格计算;宽带网;Web 2.0;SOA;开源软件;Web 应用框架;浏览器的发展;SLA(Servcie Level Aggreements);效用计算。
　　本文摘自《云计算实践指南丛书 云计算：技术、应用、标准和商业模式》一书，周洪波编著，电子工业出版社出版。

Answer 2

Cloud computing is a model for enabling ubiquitous, 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. This cloud model is composed of five essential characteristics, three service models, and four deployment models.

原文在http://csrc.nist.gov/publications/nistpubs/800-145/SP800-145.pdf

Answer 3

NIST（ 美国国家标准及技术研究所）定义：Cloud computing is 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.
云计算是一种能够通过网络以便利的、按需付费的方式获取计算资源（比如：网络、服务器、存储、应用和服务）并提高其可用性的模式，这些资源来自于一个共享的、可配置的资源池，并能够以最省力和无人干预的方式获取和释放。