文档介绍：Grid Computing & Cloud Computing
----by HuJing
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Progress
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Cloud Computing
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Definition for Cloud computing
A large-scale distributed computing paradigm that is driven by economies of scale, in which a pool of abstracted, virtualized, dynamically-scalable, managed computing power, storage, platforms, and services are delivered on demand to external customers over the Internet. (Ian Foster)
特点：
超大规模
虚拟化
高可扩展性
高可靠性
按需服务
极其廉价
通用性
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Relation
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Grid Computing & Cloud Computing
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Grid Computing & Cloud Computing
Clouds and Grids share a lot commonality in their vision, architecture and technology, but they also differ in various aspects such as security, programming model, business model, compute model, data model, applications, and abstractions.
The vision is the same
reduce the cost of computing;
increase reliability;
increase flexibility.
the problems are mostly the same
manage large facilities;
define methods by which consumers discover, request and use resources provided by the central facilities;
implement the often highly parallel computations that execute on those resources.
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Business Model
Traditional business model
software has been a one-time payment for unlimited use (usually on 1 computer) of the software.
Cloud-based business model
a customer will pay the provider on a consumption basis, such as electricity, gas, and water, relies on economies of scale in order to drive prices down for users and profits up for providers.
The business model for Grids
project-oriented in which the users or community represented by that proposal have certain number of service units (. CPU hours) they can spend.
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Architecture
PaaS
SaaS
IaaS
如：Saleforce online CRM 服务
如：Google App Engine
如：Amazon EC2/S3/SQS 服务
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Resource Management
Compute Model
Grids：
batch-scheduled compute model, don’t natively support interactive applications
Clouds:
resources being shared by