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Whether a public, hybrid, virtual private or private cloud, everyone agrees that cloud computing key benefits include scalability, instant provisioning, virtualized resources and ability to expand the server base quickly.
The majority of public cloud deployments are generally used for quality assurance testing, or where user demand peaks and falls at certain times of the day, month or year. Generally, security and compliance requirements is not an issue. Private cloud computing, on the other hand, by definition is a single-tenant environment where the hardware, storage and network are bought by and dedicated to a single client or company. Hybrid cloud offers a mix of public and private cloud computing, where public cloud resources are integrated with private or virtual private cloud services to create a unique hybrid environment.
The public cloud is defined as a multi-tenant environment, where you buy a “server slice” in a cloud computing environment that is shared with a number of other clients or tenants.
Public clouds such as Amazon EC2 and Microsoft Azure have a number of benefits:
Most public cloud deployments are generally used for web servers or development systems where security and compliance requirements of larger organizations and their customers is less of an issue.
Private cloud hosting by definition is a single-tenant environment where the hardware, storage and network are dedicated to a single client or company. A more common type of private cloud computing solution is virtual private cloud hosting, a multi-tenant environment where companies achieve networking isolation while keeping costs down by buying hardware slices with other tenants and creating private subnets.
Private cloud computing also has a number of benefits:
As opposed to public clouds, fully private clouds are not delivered through a utility model or pay-as-you-go basis because the hardware is dedicated. However, Virtual Private Clouds offer the same pay-as-you-go model as public clouds, with the added bonus of specifically provisioned hardware, network and storage configurations. Private clouds, including Virtual Private Clouds, are generally preferred by mid and large size enterprises because they meet the security and compliance requirements of these larger organizations and their customers.