Computer-readable recording medium having recorded hash-value generation program, computer-readable recording medium having recorded storage management program, and storage system

A computer-readable recording medium having recorded a storage management program for managing a storage system in which data on a virtual logical disk is stored in units of segments in a distribution manner in a plurality of storage modules, the program, when executed by a computer, causes the computer to perform a method, the method comprising:

• controlling first hash-value calculation blocks included in each of the plurality of storage modules to calculate per-segment hash values by applying a one-way hash function to data in every segment, the segments having a fixed length;
• acquiring the per-segment hash values calculated by the first hash-value calculation blocks of the storage modules;
• arranging the per-segment hash values in a segment order corresponding to the order of the data on the logical disk;
• calculating a total hash value of the logical disk by applying the one-way hash function to the arranged per-segment hash values;
• saving the calculated total hash value calculated at a specified time;
• repeating the calculation of the per-segment hash values and the calculation of the total hash value to obtain a recalculated total hash value at a later time;
• and
• comparing the calculated total hash value with the recalculated total hash value to verify the calculated total hash value and the recalculated total hash value match.

A storage system for storing data on a virtual logical disk in a storage to manage the data, the storage system comprising:

• a plurality of storage modules each including:
• storage to divide the logical disk into fixed-length segments and to store the data therein;
• and
• first hash-value calculation blocks to, upon receiving a calculation instruction, calculate per-segment hash values by applying a one-way hash function to data in every segment stored in the storage;
• and
• a storage management module including:
• a controller to, upon request for a hash value of the logical disk, control calculation processing of the per-segment hash values performed by the first hash-value calculation blocks included in each of the storage modules;
• and
• second hash-value calculation block to calculate a total hash value for the logical disk by arranging the per-segment hash values in a segment order corresponding to the order of the data on the logical disk, and by applying the one-way hash function to the arranged per-segment hash;
• and
• a verification block to save the calculated total hash value at a specified time and to compare the saved total hash value with a total hash value recalculated at a later time to verify the saved calculated total hash value and the recalculated total hash value match.