2U (Rackmount), 2 x Gigabit Ethernet Host Channel, 12 x 3.5" SAS/SATA Disk Tray (Bay), 1 x Controller w/ Cache (1GB Default, Upgradeable w/ 2GB, 4GB), 3 x Cooling Fan (Fault-Tolerant), 2 x 530W PSU (Redundant), 1 x SAS Expansion Channel, Options-(Advanced Data Service license, Cache Backup Module, Hard Disks, Spare FRUs, & Other Accessories)