The Adaptec DuraStor 7320SS subsystem includes a 2U storage enclosure with 12 SCSI drive bays, complete with redundant power supplies and cooling fans. It also includes a single RAID controller (a second controller bay is available for dual controller configurations) with four Fibre Channel and up to four back-end SCSI channels for storage expansion. The result is a 2U subsystem that provides high data availability, and is easily scalable to meet your data storage needs.