VTRAK E610SS SGL RAID 3U 16BAY SAS SAS/SATA Promise VTrak E-Class is a family of intelligent, dual controller, SAS/SATA based storage arrays that fundamentally changes storage economics from purchase and set up to operation and upgrades. Four 3Gb SAS (Serial Attached SCSI) x4 host interface ports per controller provide a reliable, high-performance alternative to Ultra SCSI 320 storage applications. Each standard 3U, 19" rack unit supports up to 16 off-the-shelf 3.5" SAS or SATA 3Gb/s drives. Attach up to four SAS JBODs to deliver 80 drive bays of direct attached storage.