Sun StorEdge 6020 Array is a storage module for the Sun StorEdge 6320 system. The array is a high-performance, modular, scalable storage device. The array can contain from 1 to 6 disk trays each of which can have from 7 to 14 disk drives. The disk drives can have a capacity as high as 146 GBytes. A disk tray is either a master unit or an expansion unit. A master unit includes a RAID controller. The array includes 2-Gbit/sec Fiber Channel connectivity to hosts. Extensive reliability, availability, and serviceability (RAS) features include redundant components, notification of failed components, and the ability to replace components while the unit is online. The array can is mounted in a rack and can be interconnected with other arrays of the same type.