Patent ID: 6966011
Filing Date: 2005-11-15
Classification: G06F,G11C

Abstract:
1. A storage system connectable to a computer comprising: a plurality of disk units; and a controller connected to the plurality of disk units, wherein the disk units store data in a plurality of data groups and error correcting data corresponding to each of the data groups, wherein the controller performs processing of reconstructing data stored in any of the disk units in which a fault has occurred based on all other data belonging to any of the data groups to which the data to be reconstructed belongs and errors correcting data corresponding to any of the data groups to which the data to be reconstructed belongs, and performs processing of a data read/write request from the computer when a fault has occurred in any of the disk units, wherein the controller has a plurality of data reconstructing modes including a first mode wherein a frequency of processing of accesses or data read/write requests is more than a threshold, and a second mode wherein a frequency of processing of accesses or data read/write requests is less than the threshold.