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Twenty years ago, large corporations housed great mainframes, connected to an ocean of cabling under a raised floor, in huge computer rooms. A cooling system shared a fragment of space.
Now "schools" of servers -- and sometimes smaller mainframes -- house far more data in much less space. Creating homes for that barrage of smaller boxes, power sources and redundant power backups has become a booming business for St. Louis companies like Homer & Shifrin Inc., Bell Electrical Contractors and Guarantee Electrical Co.
Homer & Shifrin's high-tech contracts come out of its Building Services Division, which has doubled its business in the past five years. The company, which had revenue of $10.2 million in 2000, …