Storage system, storage control device, and data relay method using storage control device

摘要

A plurality of virtual volumes with different control functions are associated with one real volume and remote copying is conducted. A relay system comprises a plurality of virtual volumes V 12, V 21 mapped to the same real volume R 1. A virtual volume V 21 for transmission control is mapped to a real volume R 1, a real volume R 2 is mapped to the virtual volume V 21, and the virtual volume V 12 for reception control is mapped to the real volume R 2. If a command is received from a local system 10, the virtual volume V 12 for reception control writes data into the virtual volume V 21 via the real volume R 2 (virtual entity). The virtual volume V 21 transmits the data to a copy destination volume V 22 and writes the data into the real volume R 1.