STORAGE SUBSYSTEM, AND METHOD FOR VERIFYING STORAGE AREA

摘要

There is provided a method for verifying a full drive as an error check processing of a storage drive, but along with the increase in capacity of the storage drive, there are cases where error check cannot be executed before using the storage area. In the present invention, quantity of use of data is estimated, and the storage areas corresponding to the estimated quantity are verified periodically. By verifying the storage area to be used in advance before actual data use, the occurrence of error can be prevented without having to execute a check of the full drive.

主权项

1. A storage subsystem coupled to a host computer, comprising:
a plurality of storage devices for storing data sent from the host computer; a processor for managing a storage area of the storage devices; and a memory for storing a management information of the storage area; wherein the processor performs tiering of the plurality of storage devices; manages each tier subjected to tiering by providing a priority order based on a performance or a property of each of the plurality of storage devices; manages an access frequency which is a number of accesses per unit time of data in the plurality of storage devices per tier; extracts data being a candidate of migration by referring to the access frequency per tier, and migrates the data to a higher tier having a higher priority or to a lower tier having a lower priority than the tier in which said data is stored; calculates an increment capacity of write data being written to the tier within a predetermined period of time per tier; and executes a verification processing of detecting and restoring a defect of a storage media of the plurality of storage devices regarding the storage area of each tier corresponding to the calculated data increment capacity before using said storage area.