Reducing energy costs by consolidating servers means moving massive amounts of data, and new migration techniques are emerging to help IT managers wring inefficiencies out of an otherwise laborious process.

"There are two ways to do a data migration: In band, which uses an actual piece of hardware, such as a switch or an appliance. Or you can go outside of the band of the flow of data, which is easier," says Josh Klein, president and CEO of AutoVirt, a Nashua, NH-based firm that sells automated data migration and optimization software, along with competitors such as F5 and Brocade.

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