Storage subsystem and data management method of storage subsystem

摘要

Since the whole storage device is blocked according to the conventional data saving method when failure occurs to the storage device in a storage subsystem, so that when failure occurs to two storage devices at the same time within a same RAID group, double failure is caused and data loss occurs. In order to solve the problem, the present invention divides a storage device into storage areas of predetermined units, constructs RAID groups from two or more storage areas, and when failure occurs to the storage area, selects a data migration destination storage area from either the RAID group in which failure has occurred or the RAID group other than the RAID group in which failure has occurred, migrates the data stored in the storage area where failure has occurred to the selected data migration destination storage area, and blocks only the storage area where failure has occurred.

主权项

1. A storage subsystem coupled to a host computer, the storage subsystem comprising:
a storage device unit having a plurality of storage devices configured to store data sent from the host computer; a management unit configured to manage the storage device unit, wherein the management unit is configured to divide the storage device unit into storage areas of predetermined units; select a data migration destination storage area when failure occurs to a storage area; and migrate data stored in the storage area where failure has occurred to a storage area of the data migration destination, and block the storage area where failure has occurred; and a RAID group comprising two or more of the storage areas, wherein the data migration destination storage area is selected from either a first RAID group to which the storage area where failure has occurred belongs or a second RAID group that differs from the first RAID group, and data is migrated thereto, and wherein a data migration destination RAID group is selected based on either a number of blocked storage areas or a ratio of blocked storage areas in the first RAID group.