Cisco Systems introduced the Cisco Containerized Data Center Monday, entering a growing market for pre-built data centers that can be delivered to a customer’s location, plugged in and powered up for a quick expansion of compute capacity. Portable data centers, which are also offered by such companies as HP, IBM, Rackspace and Sun Microsystems (now part of Oracle), are designed to be more cost-effective to own and operate compared to building a brick-and-mortar facility.