Data storage array apparatus storing error information without delay in data access, and method, program recording medium, and program for the same

Abstract

A data storage array apparatus including multiple disks and writing/reading striped data and parity data onto/from the multiple disk devices, each having a storage area divided into multiple blocks, blocks across the multiple disks forming a group, the apparatus made up of: writing/reading means for writing/reading the striped data and the parity data in a group in accordance with an access request from the outside; error information generation means for generating error information indicating the presence/absence of an error caused by a writing operation by the writing/reading means and storing the error information in a memory; judgement means for, at each writing operation, judging whether the error information should be written to a predetermined group; and control means for controlling the writing/reading means to read error information from the memory and write the error information to the predetermined group according to a result obtained from the judgement means.