Patent ID: 6374269
Filing Date: 2002-04-16
Classification: G06F,Y10S

Abstract:
A storage sub-system, comprising:a recording medium that contains data divided into predefined volume units; data transferring means for controlling data transfer to and from said recording medium; a cache memory for storing data transferred to and from said recording medium; redundant data generating means for generating redundant data from a plurality of data; data restoring means for restoring original data from the redundant data and from the data from which the redundant data is generated; control means that manages said redundant data and the data from which said redundant data is generated as a parity group; staging means for staging data to the cache memory from said recording medium; and a staging information table for storing information indicating whether said redundant data to current data is to be read, regardless of whether the data is successfully read when said current data is read from the recording medium; wherein said staging means stages data by referring to said staging information table.