Patent ID: 6807642
Filing Date: 2004-10-19
Classification: G06F

Abstract:
A cluster system comprising a plurality of computers connected to each other through at least one network and disk drives connected to said computers, and managing said disk drives as a component of a virtual redundant array of inexpensive disks, said cluster system comprising:a cluster manager which performs exclusive control of said cluster system, and converts a global command which is a read/write command to said virtual redundant array of inexpensive disks into one of local commands including a read/write command to at least one of said disk drives and a parity calculate command; and a control unit which operates independently of said cluster manager on said plurality of computers, said control unit comprising: a command conversion function means operating in one of said computers for making said cluster manager convert generated global command into at least one of said local commands when the global command is generated in said one of said computers; a disk control means for reading/writing from/to at least one of said disk drives according to transferred local command; a parity calculation means for calculating parity according to the transferred local command; and a command transfer means for transferring the local command converted by said cluster manager to one of a corresponding computer of said computers, said disk control means and said parity calculation means according to the contents of the converted local command.