Data migration in storage system

摘要

The storage system includes a plurality of storage nodes and a control device coupling unit. Each of the storage nodes includes at least one storage device configured to store data and at least one control device configured to control input and output of data for the storage device. The control device coupling unit is configured to connect the control devices without using an access path between the control device and a host computer connected to the storage system. The control devices connected by the control device coupling unit are included in mutually different storage nodes.