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Hey, You, Get off of My Cloud

The emerging Public Cloud versus Private Cloud debate is not just about which solution is best. It extends to the very definition of cloud. I won’t pretend that my definitions of public cloud and private cloud match everybody elses, but I would like to begin by establishing my point of reference for the differences between public and private cloud.

Public Cloud: A multi-tenant computing environment that can deliver on-demand resources in a scalable, elastic manner that is both measured and metered, and often charged, on a per-usage basis. The public cloud environment is typically, but not necessarily, accessible from anywhere – through the internet.

Private Cloud: A single tenant computing environment that may provide similar scalability and over-subscription to the Public Cloud, but solely within the single tenant’s infrastructure. This infrastructure may exist on the tenant’s premises, and may be delivered in a dedicated model through a managed services offering. The private cloud environment is typically accessible from within the tenant’s infrastructure. However, it may be necessary to enable external access via the internet or other connectivity.

It is commonly understood that a cloud environment, whether public or private, has several benefits including lower total cost of ownership (TCO). However, there are considerations that should be made when determining whether the appropriate option is a public or private cloud. Below are some key points to consider, as well as some perceptions, or misperceptions, of the benefits of each.

In a Private Cloud, the owner or tenant may have more flexibility in establishing policies and procedures for provisioning, usage, and security. If there are specific controls, that may otherwise impact other tenants in a shared environment, there may be greater control given to the organization within a dedicated environment.

In a Public Cloud, Continue reading…

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