Control apparatus, control method, and control program

A control method in which a control apparatus, which controls allocation of data included in a logical volume so that the data is allocated in a plurality of physical storage areas, which have been assigned so as to span a plurality of RAID groups, according to a predetermined allocation pattern, performs processing to

• identify an access trend for each of the plurality of RAID groups that are accessed in response to access requests for the logical volume,
• decide whether the logical volume satisfies the at least one changing condition, according to the access trend identified for each of the plurality of RAID groups and to correspondence information that includes at least one changing condition under which an allocation pattern for the data is changed and a new allocation pattern substituted for the allocation pattern in correspondence to each other, the correspondence information being stored in a storage unit, and
• reallocate, if the control unit decides that the at least one changing condition is satisfied, the data included in the logical volume according to the new allocation pattern corresponding to the at least one changing condition.

A non-transitory and computer-readable storage medium storing a control program that causes a control apparatus to execute processing, the control apparatus controlling allocation of data included in a logical volume so that the data is allocated in a plurality of physical storage areas, which have been assigned so as to span a plurality of RAID groups, according to a predetermined allocation pattern, wherein the processing comprising;

• identifying an access trend for each of the plurality of RAID groups that are accessed in response to access requests for the logical volume,
• deciding whether the logical volume satisfies at least one changing condition, according to the access trend identified for each of the plurality of RAID groups and to correspondence information that includes the at least one changing condition under which an allocation pattern for the data is changed and a new allocation pattern substituted for the allocation pattern in correspondence to each other, the correspondence information being stored in a storage unit, and
• reallocating, if the control unit decides that the at least one changing condition is satisfied, the data included in the logical volume according to the new allocation pattern corresponding to the at least one changing condition.