Patent ID: 6662282
Filing Date: 2003-12-09
Classification: G06F

Abstract:
A data-consistent, distributed unified data set device group that stores a distributed unified data set, the distributed unified data set device group comprising:a first data storage component, within a first supervisor local data-storage array, that stores a first portion of the distributed unified data set, the first supervisor local data-storage array receiving WRITE requests directed to the first portion of the distributed unified data set from a host computer via a communications medium, the first supervisor local data-storage array including a controller that executes a unified sequence number component that provides sequence numbers for WRITE requests directed to the data-consistent, distributed unified data set device group and that executes controller functionality for receiving, carrying out, and responding to WRITE requests received from a host computer; a second data storage component, within a second subordinate local data-storage array, that stores a second portion of the distributed unified data, the second subordinate local data-storage array, the second subordinate local data-storage array including a controller that executes controller functionality for receiving, carrying out, and responding to WRITE requests received from a host computer; and a mirror unified data set that mirrors the distributed unified data set stored on one or more remote data-storage arrays.