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Forrester Defines Three Cloud Storage Use Cases

While a lot of hype has been generated about cloud computing, particularly storage in the cloud, Forrester Research senior analyst Andrew Reichman contends that are really only three situations in which cloud storage is a viable alternative to managing storage on-premises: when supporting cloud applications, as secondary back-up and for file storage of infrequently used files.

The first in his list, storage of data for applications that are also delivered in the cloud, is commonly known as Software as a Service (SaaS). Typically, businesses delve into cloud computing one application at a time and sign up for SaaS services such as e-mail in the cloud from Google or customer relationship management software from "If an app is moving from on-premises to the cloud, that changes how much storage on-premises you're going to need," said Reichman, who also advised that the SaaS vendor needs to accurately determine how much storage the customer's application is going to need. It's also not uncommon for a business to have different cloud vendors for different applications because each may have particular expertise in one app area or another, he said.

Second, cloud storage would be appropriate for secondary backup of data. Storage needs to be in the same location as the application servers so data is saved to storage quickly, but backup storage could and should be off-site for disaster recovery purposes, and the cloud could be a suitable solution, Reichman said.

However, the cloud provider needs to have enough bandwidth to return data quickly to the customer's data center when needed. As he explains it, data is saved to storage from the application server a little bit at a time, but when a failure occurs and the backup storage is called to action, it needs to send all the data stored over time at once. "When you're restoring, you're potentially talking about a huge amount of data where all the data that's on that server has to go back across the wire. That is a potential bandwidth problem," Reichman said.

Third, cloud storage is ideal for file storage. About 80 percent of files stored by a given organization are accessed infrequently, sometimes not at all, so they could be stored in a cloud if an organization is willing to tolerate some degree of slower access to them. As it is, remote offices would experience a delay in accessing documents on a file server at the home office anyway, so accessing those files in the cloud would take about the same amount of time.

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