The present invention relates to a data handling system having a redundant storage configuration. More particularly, the present invention relates to a data storage suitable for averaging workload and for matching contents between storage devices having duplicate data, respectively, and constituting a redundant storage arrangement.
Japanese Published Patent Application No. 06-259336 discloses a technique for matching contents between a master extended storage device and a sub extended storage device both of which constitute a redundant storage configuration. The disclosed technique involves matching the order in which to perform store operations on the master and the sub extended storage devices in order to keep contents identical between the master and the sub extended storage devices. However, the disclosure contains no reference to fetch operations on the master and the sub extended storage devices.