Abstract: A data division unit divides transfer data into pieces of partial data to be transferred for each route. A first transfer unit transmits a first partial data via a dimension-order routing route, among pieces of partial data acquired by division, and a second transfer unit transmits a second partial data different from the first partial data via a relay node route to a relay node.

Abstract: A disclosed management method includes calculating, for each of partitions, a total calculation amount of calculation nodes included in the partition by using calculation amounts managed by a plurality of management nodes, wherein the plurality of calculation nodes, the plurality of management nodes each of which has a storage unit storing calculation amounts of calculation nodes which are management targets, and the management apparatus which manages connection among the plurality of management nodes are included in a system; assigning, for each of the partitions, management nodes among the plurality of management nodes to a predetermined layer in which the management nodes manage calculation nodes included in the partition, based on the total calculation amount of calculation nodes included in the partition; and connecting the plurality of management nodes in a way that management nodes in a layer above the predetermined layer manage the management nodes in the predetermined layer.

Abstract: A disclosed management method includes calculating, for each of partitions, a total calculation amount of calculation nodes included in the partition by using calculation amounts managed by a plurality of management nodes, wherein the plurality of calculation nodes, the plurality of management nodes each of which has a storage unit storing calculation amounts of calculation nodes which are management targets, and the management apparatus which manages connection among the plurality of management nodes are included in a system; assigning, for each of the partitions, management nodes among the plurality of management nodes to a predetermined layer in which the management nodes manage calculation nodes included in the partition, based on the total calculation amount of calculation nodes included in the partition; and connecting the plurality of management nodes in a way that management nodes in a layer above the predetermined layer manage the management nodes in the predetermined layer.

Abstract: If a disk drive receives a program transfer command issued by a host system, a program specified by the command is written to a disk. Next time the disk drive is powered on, a process is executed during an activating process, the process including using the program written to the disk to rewrite a program stored in a nonvolatile memory.

Abstract: If a disk drive receives a program transfer command issued by a host system, a program specified by the command is written to a disk. Next time the disk drive is powered on, a process is executed during an activating process, the process including using the program written to the disk to rewrite a program stored in a nonvolatile memory.

Abstract: A servo system for use in a magnetic disk apparatus has a memory unit prestoring offset data used to correct offset which can occur when a head is moved to a target track on the disk. The CPU of the servo system uses the offset data stored in the memory unit when the head is moved to the target track at the time of reading and writing data. A settling time period is obtained while the head is moved to the target track on the disk at the time of data reading/writing. The difference between the settling time period is compared with a reference value. If the difference does not fall within an allowable range, the offset data stored in the memory unit is renewed.