MANAGEMENT DEVICE, DISTRIBUTED STORAGE SYSTEM, ACCESS DESTINATION SELECTION METHOD, DATA STORAGE UNIT SETTING METHOD, AND PROGRAM

摘要

A management device manages a distributed storage system that is equipped with multiple data storage units that store data and have multi-digit identification numbers. The management device acquires the identification numbers of the multiple data storage units; designates, as groups, sets of data storage units for which, when prescribed lower-order digits which have been set as the masking-target digits of the acquired identification numbers are removed, the remaining upper-order digits of the resulting identification number are the same; assigns to the designated groups group numbers obtained by replacing the masking-target digits with a prescribed value; acquires group hash values, which are values obtained when a hash function is applied to the group numbers; acquires data key hash values by applying the hash function to key that corresponds to data which is to be read/written; and associates data which is to be read/written with the data storage unit group corresponding to the aforementioned designated groups of storage units having the same identification number, by allocating the data key hash values to any of the group hash values according to a prescribed allocation method.