This is an HP NetServer Rack Storage/8 enclosure for Hewlett Packard's NetServer LH 3 and LH 3r servers.It has a lot of new innovative features to offer: Ultra SCSI disk drive support, active external/internal bus segregation, support for 10,000rpm disk drives. It supports RAID levels 0, 1, 3, and 5 for superior data protection (support for RAID levels 10, 30, and 50 with HP NetRAID controller), dual hot-swap universal voltage Redundant Power Supplies (RPS) allows continuous usage of server during replacement of failed power supply module, dual hot-swap fans with speed control-variable speed automatically controlled by demand for cooling, dual data buses support storage sharing between two HP NetServer LXr Pro servers.