STORAGE APPARATUS AND DATA MANAGEMENT METHOD

摘要

A storage apparatus has a first storage device in which the user data is stored and a second storage device which the management information including a primary hash value corresponding to the data management unit including a user data is stored for every data management unit. The storage apparatus (A) receives a read request, acquires a primary hash value of a first management unit which is a data management unit including read target user data from the second storage device, (B) reads data of the first management unit from the first storage device, (C) computes the primary hash value based on the data of the data management unit which is read, (D) determines whether the primary hash value in (A), and the primary hash value in (C) are in agreement, and (E) sends the read target user data to a upper level apparatus when the agreement is obtained.

主权项

1. A storage apparatus, comprising:
a first storage device in which a user data is stored, and a second storage device in which a management information including a primary hash value corresponding to a data management unit including the user data is stored for every data management unit; and a controller coupled to the first and the second storage devices wherein the controller is configured to, (A) receive a read request of a read target user data from the upper level apparatus, and acquire the primary hash value of a first management unit which is a data management unit including the read target user data from the second storage device, (B) read data of the first management unit from the first storage device, (C) compute a primary hash value based on the data of the first management unit, (D) determine whether the primary hash value in (A) and the primary hash value in (C) are in agreement or not, and (E) send the read target user data included in the first management unit to the upper level apparatus when the primary hash value in (A) and the primary hash value in (C) are in agreement.