NEW YORK - Amazon.com Inc. has two businesses: The one it runs in November and December during the height of the holiday shopping rush, and the one it runs the rest of the year. Building a cost-effective IT infrastructure that can scale to handle the year-end crush while remaining inexpensive during slower months is one of the obstacles Amazon.com's IT staff grapples with, Vice President of Infrastructure Tom Killalea said Tuesday in a presentation at LinuxWorld.

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