Storage device

1. A storage device comprising:

a plurality of processing units configured to issue a control instruction for reading out or writing data; and

a plurality of storage units connected to each other in two- or more- dimensional arrangement, wherein

each storage unit includes a memory capable of storing data and a routing unit configured to perform a transfer process by determining a transfer route of the data to another one of the storage units on the basis of positional information of the storage unit included in the data, and

N×(1+t c /t s )/(2√{square root over (N)}+t f /t s )≦M≦N is satisfied wherein N is the number of the storage units, M is the number of the processing units, t c is a processing time taken by each processing unit to read out and write, t s is one transfer time between the storage units, and t f is a time taken to perform other processes in the storage unit.

2. The device according to claim 1 , further comprising a plurality of printed boards connected to each other, wherein at least one processing unit and at least one of the storage units are disposed on each of the printed boards.

3. The device according to claim 2 , further comprising a plurality of slots to which the printed boards are inserted, respectively, wherein

each of the slots includes a switch unit configured to switch so that terminals facing each other of the each of the slots are connected to each other when the printed board is not inserted to the each of the slots.

4. The device according to claim 2 , wherein the processing units and the storage units are capable of hot swap.

5. The device according to claim 2 , wherein the memory is configured to be hot-swapped from the storage unit in which said memory is included.