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Cloud Computing : Private and Public Clouds from a technical perspective – Part 12

Private Cloud

A private cloud is an infrastructure that is used only for a single organization, whether handled internally or by a 3rd-party and hosted internally or externally.

The private cloud is a new method of computing in which corporate IT infrastructure is present as a ubiquitous, easily accessible, and reliable utility service.

Business owners and application owners, who want to use a new business service, can use the infrastructure as a standard service, without understanding the complexities of servers, storage, and networks.

Following are the examples of the Private Cloud:

  • Windows Server 2012 R2

  • Microsoft System Center 2012 R2

  • VMware vCloud Suite

  • IBM SmartCloud Orchestrator

Advantages of a private cloud

Following are the advantages of a private cloud:

  • The client pays for resources as they are used and allows capacity fluctuations over time.

  • SLAs and contractual terms and conditions are negotiable between client and the cloud vendor for meeting the particular requirements.

  • Data and secure information are placed behind the corporate firewall.

  • Private clouds can be used for particular operating systems and applications, and make use of cases that are unique to the client.

  • Some cost savings are possible from economies of scale of providers for a large enterprise-wide solution.

  • Cloud vendor can provide a fully-managed service.

  • Self-service provisioning of infrastructure capacity is only feasible up to a point.

Public Cloud

A public cloud is based on the standard cloud computing model, in which resources, such as applications and storage are made by a service provider and are available to the general public over the Internet.

The public cloud services can be free or delivered on a pay-perusage model. The public cloud can provide immediate cost savings to an organization.

Depending on the specific requirements of the organization, such as customized configuration requirements and service-level agreements (SLAs) regarding up-time requirements, a company should decide whether to move critical applications to a public cloud vendor.

Following are the examples of the public cloud:

  • Google App Engine

  • Microsoft Windows Azure

  • IBM Smart Cloud

  • Amazon EC2

  • NetSuite

  • Rackspace

  • SoftLayer


Disadvantages of a public cloud

Following are the disadvantages of a public cloud:

  • The sharing of sensitive data takes place beyond the corporate firewall.

  • Distance may create challenges with access performance and user application content.

  • There are limited platform choices available. Support for operating system and application stacks may not meet with the requirements of the client.

  • A separate provider needs to be found (and paid for) in order to maintain the computing stack.

Advantages of a public cloud

Following are the advantages of a public cloud:

  • Up-front capital is not investment in infrastructure.

  • The client pays for resources as they are used and permits capacity fluctuations over time.

  • There is a simple web interface for self-service provisioning of infrastructure capacity.

  • There is a possibility of significant cost savings from provider’s economies of scale.

  • Operating costs for the cloud are absorbed in the usage-based pricing.

  • Vendors are encouraged to deliver to contract.

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