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Each year 1.5 million shelter animals are euthanized (670,000 dogs and 860,000 cats). Source: ASPCA. The solution is not to shelter unwanted pets, but to SHUT DOWN THE PET MILLS. Anyone who wants a pet will just have to adapt a great pet from a shelter.

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Cloud Delivery Models

Excerpt:

You have just learned about the different service models available for implementing a cloud computing solution. In order to realize the value from these service models and for the customers to have access to them, a delivery model must be chosen. Implementing a cloud deployment model can vastly impact an organization. Implementation requires careful consideration and planning in order to be successful. If your role is the IT administrator, it is your responsibility to educate the organization on the benefits and challenges of implementing a cloud computing model. You need to evaluate the business needs and determine what benefits a cloud computing model would bring to your organization. Whichever cloud model you choose, whether it be private, public, or hybrid, it needs to map well to the business processes you are trying to achieve.

Private Cloud

A private cloud is a cloud delivery model that is owned by a single organization and enables them to centrally access IT resources from a variety of locations, departments, and staff. A private cloud solution is implemented behind the corporate firewall and is maintained by the local IT department. A private cloud utilizes internal resources and is designed to offer the same benefits of a public cloud without relinquishing control, security, and recurring costs to a cloud provider. In a private cloud model the same organization is both the cloud consumer and the cloud provider.

The decision to implement a private cloud is usually driven by the need to maintain control of the environment because of regulatory or business reasons. For example, a bank might have data security issues that prevent them from using a public cloud service, so they might implement a private cloud to achieve the benefits of a cloud computing model.

A private cloud is a combination of virtualization, data center automation, chargeback metering, and identity-based security. Virtualizations allows for easy scalability, flexible resource management, and maximum hardware utilization. A private cloud solution also involves having the ability to auto-provision physical host computers through orchestration software, which is discussed later in this chapter.

One of the downsides to a private cloud is that an organization does not get the return on investment it does with other cloud models. This is because the organization is still responsible for running and managing the resources instead of passing that responsibility to a cloud provider.

Public Cloud

Unlike a private cloud that is owned by the organization, a public cloud is a pool of computing services that are delivered over the Internet via a cloud provider. A cloud provider makes resources such as applications and storage available to organizations over the Internet. Public clouds generally use a pay-as-you-go model, which gives companies the benefit of paying only for the resources that they consume. Public clouds allow for easy and inexpensive setup because the hardware, application, and bandwidth costs are covered and maintained by the cloud provider and charged as part of the service agreement.

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