The Promise VTrak J610s is optimized for organizations deploying cost-effective small-to-medium application clusters, disk-to-disk backup and midrange storage solutions. The dual 3Gb SAS host interface ports offer the ease of management and performance required by companies running popular departmental and back-office applications including file/print, e-mail, database and Web services. The two external SAS ports provide the needed connectivity and bandwidth for large capacity solutions requiring multiple JBOD boxes cascaded together while still providing dual server support and host port failover or aggregation. The VTrak J610s packs up to 16 drives per system, offering industry-leading capacity in just 3U of standard 19-inch rack space. The J610s unit's compact form factor maximizes density, increasing capacity per unit of rack space. Multiple J610s systems can also be connected to the same server using standard SAS features to deliver massive storage to capacity-hungry applications such as disk-to-disk backup, media archiving, video surveillance and compliance storage. Promise has designed the J610s chassis to be fully compatible with all future Promise external storage products. By using the same chassis, drive carriers, and cooling units, upgrading the RAID controllers and JBOD modules is fast and simple. With the VTrak J610s, Promise has dramatically narrowed the gap between simple fault tolerance and No Single Point of Failure. The VTrak J610s uses a fully redundant, hot-swap design and continuously monitors all system components. It can withstand failures to disks, power supplies, cooling and I/O modules without interrupting system operation.