Obtaining an instance of a cloud computing environment via a public cloud is

Obtaining an instance of a cloud computing

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Obtaining an instance of a cloud computing environment via a public cloud is easy and inexpensive because hardware, application, and bandwidth costs are covered by the provider. Computing resources in a public cloud can be scaled to meet the needs of the cloud users. A public cloud can use flexible pricing models. No resources are wasted because the cloud users pay for what they use on an as- needed basis, without the requirement to invest in additional internal infrastructure. A public cloud helps businesses shift the bulk of the costs from capital expenditures and IT infrastructure investment to a utility operating expense model. A public cloud also helps isolate the end-users from the complexity of IT operations and management.
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IBM ISV and Developer Relations © 2010 IBM Corporation 32 Public Cloud Public cloud or external cloud describes cloud computing in the traditional mainstream sense, whereby resources are dynamically provisioned on a fine-grained, self-service basis over the Internet via Web applications/Web services. These Web applications/Web services originate from an off-site third-party provider who shares resources and bills on a fine-grained utility computing basis. Public clouds are where IT activities/functions are provided "as a service" over the Internet, which allows access to technology- enabled services without knowledge of, expertise with, or control over the technology infrastructure that supports them. Therefore, public clouds are also called "external clouds".
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IBM ISV and Developer Relations © 2010 IBM Corporation 33 Private Cloud Private cloud and internal cloud are neologisms that some vendors have recently used to describe offerings that emulate cloud computing on private networks. These (typically virtualization automation) products claim to "deliver some benefits of cloud computing without the pitfalls", capitalizing on data security, corporate governance, and reliability concerns. Private clouds are where activities and functions are provided "as a service" over a company's intranet. Private clouds are built by an organization for its own users, and everything is delivered within the organization's firewall (instead of the Internet). The private cloud owner does not share resources with any other companies, so multitenancy is not an issue. Therefore, private clouds are also called "internal clouds".
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IBM ISV and Developer Relations © 2010 IBM Corporation 34 Private Cloud A private cloud is owned by an enterprise and can only be accessed by internal users. A private cloud is deployed internally behind the corporate security firewall. A private cloud is operated and maintained by either the enterprise's IT operations or by a 3rd party cloud service provider. By totally owning a cloud computing environment, an enterprise can provide and govern computing resources (physical servers, application servers, storage space, applications, services, etc.) in an efficient, compliant, and secure manner. At the same time, by using a private cloud, an enterprise can also achieve significant cost saving from the infrastructure's consolidation and virtualization.
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