The Many Faces of Cloud – How to Choose the Right Cloud Model - Page 2

Cloud computing is, no doubt, on the right side of the virtualization debate. Questions, however, remain whether a private, public or hybrid cloud is best.

 By Owen Garrett
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On the other hand, if you use a public cloud, you outsource all of the infrastructure you use. A third-party vendor provides the compute, storage, network and other resources you use, typically on a pay-by-use basis. The rental structure varies from a monthly to even a “pay-as-you-go” hourly model. Once your data is stored, you can then access it remotely.  Google, Salesforce and Amazon are all well-known public cloud providers.

An easy analogy to understand the differences between a public and private cloud is to think of the private cloud as your own car, while the public cloud is like public transportation, shared by lots of people, prone to many more disruptions that are out of your hands. And while the private cloud trumps its public counterpart in many areas, there's still a deserving place for the public cloud, especially for costs savings.  

When using a public cloud, you're using someone else's resources on demand, so scaling up or down is as easy as increasing or decreasing rental fees. If you don't have superfluous internal resources to construct a private cloud, the public option is a more risk-averse approach. The public cloud calls for no upfront investment in infrastructure, so if your project completes or is ultimately unsuccessful, your organization isn't left with an unused investment.   

If your organization plans to put a heavy workload on the cloud, with tasks like image processing services or online gaming, the public cloud could be the best option. Let's say, for example, your organization specializes in online games. The game goes viral and becomes massively successful and increases its users by 3,000 percent. If you're using the public cloud, you can very easily scale up to meet demand. Otherwise, you run the risk of burdening your internal resources to maintain and operate intensive cloud activities. 

The trade-off here is, clearly, control. When taking the public route, you give up oversight of the data's security, technology performance, and costs. Yet because both types of clouds offer desirable features, more organizations are migrating to a hybrid private-public model. In many cases, it's easier to run a hybrid system than to specialize toward an exclusively private or public cloud. For example, a company may store archived data in a public cloud, while keeping confidential employee and client data in-house in a private cloud.  A hybrid approach gives companies the scalability and cost savings of public clouds but with enhanced control and security of a private cloud.

Ultimately, the type of cloud you go for depends largely on the services you want to use and how effectively they can be integrated into your network infrastructure. But no matter which cloud you choose, taking the first step towards the cloud will no doubt lead to more streamlined and cheaper services. And in this day and age, who doesn't want that?

This article was originally published on Jul 31, 2010
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