IDG News Service — Hewlett-Packard (HPQ) has released a smaller version of its portable data center, this time based on a standard 20-foot shipping container, half the size of its first model.

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HP hopes the lower entry price of the smaller system will help it to attract more customers. It will also be easier to ship, since roads in some parts of the world can't handle the 100,000-pound weight of a fully loaded 40-foot container, said Jean Brandau, an HP product manager.

HP calls its product the Performance Optimized Datacenter, or POD. It released the first one in mid-2008, following other vendors including Sun Microsystems (JAVA), now part of Oracle (ORCL). Other vendors also sell them, including IBM (IBM) and Rackable Systems, and Dell (DELL) has built a few on a custom basis.

Containerized data centers provide a way for companies to add more storage and compute power quickly, without needing to invest in a new data center or expand an existing facility. HP's 20-foot POD can house 10 racks of compute gear, compared with 22 for the 40-foot model.

Other companies, including Microsoft (MSFT), have been using them as a standard building block in data centers, because they allow them to add new capacity quickly, and because their enclosed design makes them highly energy efficient.

"This is clearly not a high-volume product, but for certain use cases it is a good fit," said IDC analyst Jean Bozman. Other possibilities include using a container for a disaster recovery site separate from a company's main data center, or for use in the field by the military or oil and gas companies, she said.

The 20-foot box has a list price of US$600,000 without the IT equipment inside, half the price of the 40-foot container. Fully loaded, the containers can easily run to several million dollars.

They can also accommodate a lot of very dense compute gear. HP says its 20-foot container provides an average of 29 kilowatts per rack, and a maximum of 34 kilowatts. That compares to around 12 kilowatts per rack in a state-of-the-art data center, Brandau said.

Part of the reason is the efficient cooling system. Each rack is served by four variable-speed fans in the ceiling of the container, and the speed is adjusted for each rack depending on the temperature, measured by sensors on each rack.

"One of the main issues we thought about is blade adoption, because of the very high power and cooling densities required for those systems," Brandau said.

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