STORAGE SUBSYSTEM AND OPERATING METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a system for shortening time necessary for recalculating a parity after the system fails and for preventing data in a RAID array from being destructed. SOLUTION: The storage subsystem is provided with: a RAID array including a plurality of disks for recording a plurality of stripe data and their parity values; a non-volatile memory for storing immediately preceding stripe data to be updated by a write processing; and a RAID controller configured to store an existing immediately preceding stripe data stored in the non-volatile memory before the write processing is performed. The RAID controller calculates an update parity information to the destructed specified stripe by using the existing data in the non-volatile memory to the data block of the stripe determined to be indecipherable due to the failure of the system and the data read out from the data block of the decipherable stripe. COPYRIGHT: (C)2009,JPO&INPIT