2U (Rackmount), 12 x 1GbE iSCSI Host Channel, 24 x 2.5" SAS Disk Tray (Bay), 2 x Controller w/ Cache (1GB Default, Upgradeable w/ 2GB, 4GB), 2 x Cooling Fan (Redundant), 2 x 530W PSU (Redundant), 2 x SAS Expansion Channel, 2 x Battery Backup Unit, Options-(Advanced Data Service license, Flash Backup Module,Mux Board, Hard Disks, CBM, Spare FRUs, & Other Accessories)