If your data center processing load doubled this year, could you handle the growth?

That’s what happened to Bazaarvoice, an Austin, Texas-based start-up that serves up product ratings and reviews to more than 180 e-commerce sites run by Sears, Dell, Macy’s and others. Last year, Bazaarvoice needed several dozen additional servers to run its proprietary software.

To keep up with the growth, Bazaarvoice outsources its data center operations to Rackspace, a top-tier Web hosting company

``Theoretically it would be possible for us to run our own data center, but it would be far more difficult for us to keep up with the growth without a service provider like Rackspace,’’ says Andy Maag, vice president of engineering for Bazaarvoice.

``If you have to grow your capacity very quickly, you can run into physical space constraints, power constraints and environmental constraints like air conditioning,’’ Maag says. ``When you’re a fast-growing business that can present problems. When you’re a specialist like Rackspace, and you’re already in aggregate spread across many data centers and you have so many people, you’re able to handle fast-growing traffic.’’

More booming businesses like Bazaarvoice are turning to Web hosting companies, including Rackspace, Savvis, AT&T, Terramark and IBM, to handle their data center operations. These companies are growing at an average of 15% per year, according to IDC.

The growth is coming from ``complex hosting,’’ says John Engates, CTO of Rackspace. ``It can be serving both the enterprise and the more Web 2.0-centric group. Complex hosting means it’s not just dedicated [servers]. It’s really a solution with firewalls and load balancers and networking components as well as services to take care of them like patching and monitoring.’’

Engates estimates that complex hosting is growing at a much higher rate -- as much as 70% to 80% per year. He says about half of Rackspace’s 15,000 customers buy complex hosting services. Rackspace operates eight data centers, four in the United States and four in the United Kingdom.

The customers that are driving demand for complex hosting include software-as-a-service companies with unpredictable growth and e-commerce companies with seasonal spurts in traffic. Another thriving market is short-term promotional Web sites run by marketing departments or advertising agencies.

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