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.

1. Cloud Computing Definition
Cloud Tenets
Service Models Deployment Models
• Software-as-a-Service (SaaS) • Private Cloud
• Platform-as-a-Service (PaaS) • Public Cloud
• Infrastructure-as-a-Service • Hybrid Cloud
(IaaS)
http://csrc.nist.gov/publications/drafts/800-145/Draft-SP-800-145_Cloud-definition.pdf
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2. Rapid Elasticity
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3. Measured Service
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4. Broad Network Access
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5. Resource Pooling
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6. On-Demand Self-Service
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7. Cloud Service Models
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Sources: IDC 213197, 215504, 217579, 217945, 218252, 218938; Gartner 166525; the451Group
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8. Examples of Cloud Eco-systems
• )2/3/ • Google Apps
– /-0/. .43 I =0 2I M B • SaaS - Gmail
– I $ RUT • SaaS - Docs
– I 92 • PaaS - Apps Marketplace
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• PaaS - Development
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• Enterprise (IaaS)
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– ,36 ,/+ 4/2' K L Rackspace
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2828

9. Cloud Deployment Models
Cloud Service
Provider
Enterprise X Dedicated for
Enterprise X
Enterprise P Enterprise Q
Cloud Service
Provider
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Virtualized Data Center and Cloud 2929

10. Evolution of IT Roles
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