Select M5314A drive enclosures to expand any Enterprise Virtual Array. Drive enclosures for new Enterprise Virtual Arrays are installed by HP manufacturing. Drive enclosures for existing Enterprise Virtual Arrays are installed on-site by HP Global Services. It is recommended that drive enclosures be added in pairs to a maximum of 12 per cabinet.AD542A is an M5314A dual FC loop 14-bay drive enclosure with mounting hardware and all the necessary interconnect cables.