Fecha de publicación: 27/03/2003 Fuente: WIPO "swarm" A high−performance, log−structured implementation of a RAID subsystem including disks (251), sectors (241), pages (231), stripes (221), segments (211) and log (201) that can be efficiently implemented in software. The methods described here allow the RAID subsystem to achieve high performance without using specialized hardware such as non−volatile memory or hardware XOR/DMA engines. Furthermore, the RAID implementation described here is well suited for supporting many functions required for advanced storage virtualization such as virtual disks, graceful addition and removal of disks, tolerating multi−disk failures, and snapshots.