a management apparatus is capable of more precisely distributing the load in redundant system reconstruction. The management apparatus is configured to detect a data migration instruction to migrate data of any one of plurality of data processing units; identify a plurality of groups that a plurality of operational data clusters stored by the any one of the plurality of data processing units belong to; identify a plurality of data processing units corresponding to each group; and change a redundant data cluster of the same group as an operational data cluster stored by the any one of the plurality of data processing units to an operational data cluster.