A system can include an enclosure having an exterior surface and an interior region that is characterized by a width and a length that is longer than the width; a plurality of trays mounted in racks that line a majority of each side of the length of the interior region and that define an aisle therebetween which is suitable for passage by one or more human occupants; cooling coils configured to capture heat generated by the plurality of trays and exhaust the heat outside the interior region; a plurality of connections on the exterior surface for supplying electrical power to the plurality of trays, supplying cooling fluid to the cooling coils, and for receiving cooling fluid discharged from the cooling coils; and doors at either end of the aisle configured and positioned to facilitate emergency egress from the enclosure by a human occupant.