Cluster system having virtual raid, computer for the cluster system, and parity calculation method in the cluster system

摘要

A cluster system managing a plurality of disk drives as a component of a virtual RAID comprises a cluster manager and a control unit. The cluster manager converts a global command G into local commands and a parity calculate command. The control unit comprises a command conversion function means, a disk control means, a parity calculation means, and a command transfer means. The command conversion function means makes the cluster manager convert the command G into the commands. The disk control means reads/writes from/to the units to according to the commands. The parity calculation means calculates the parity according to the command. The command transfer means transfers the command to one of the computer, the disk control means and the parity calculation means according to the commands.