Management server and data migration method

A Storage system coupled to a first primary storage apparatus including a first primary volume which is provided to a host computer, and a first secondary storage apparatus including a first secondary volume which is a remote copy pair of the first primary volume, the storage system comprising:

• a second primary storage apparatus including a second primary volume and a virtual logical volume;
• a second secondary storage apparatus including a second secondary volume;
• and
• wherein the second primary storage apparatus is configured to:
• map the first primary volume of the first primary storage apparatus to the virtual volume;
• relate a first identifier of the first primary volume to the virtual volume;
• respond the first identifier as a identifier of the virtual volume to the host computer when the second primary storage apparatus receives an inquiry command from the host computer;
• start receiving access request to the virtual volume from the host computer;
• access the first primary volume when the second storage apparatus receives the access request to the virtual volume;
• configure a remote copy pair of the virtual volume and the second secondary volume;
• and
• configure a migration pair of the virtual volume and the second primary volume,
• wherein, after completion of the migration from the virtual volume to the second primary volume, the second primary storage apparatus is configured to:
• relate the first identifier to the second primary volume;
• and
• configure copy pair of the second primary volume and second secondary volume.

A migrating a remote copy method for a storage system, the storage system including:

• a first primary storage apparatus including a first primary volume provided for a host computer;
• a first secondary storage apparatus including a first secondary volume which is a remote copy pair of the first primary volume;
• a second primary storage apparatus including a second primary volume and a virtual logical volume;
• and
• a second secondary storage apparatus including a second secondary volume, the migrating a remote copy method comprising steps of:
• mapping the first primary volume of the first primary storage apparatus to the virtual volume;
• relating a first identifier of the first primary volume to the virtual volume;
• responding the first identifier as a identifier of the virtual volume to the host computer when the second primary storage apparatus receives an inquiry command from the host computer;
• starting receiving access request to the virtual volume from the host computer;
• accessing the first primary volume when the second storage apparatus receives the access request to the virtual volume;
• configuring a remote copy pair of the virtual volume and the second secondary volume;
• and
• configuring a migration pair of the virtual volume and the second primary volume,
• wherein, after completion of the migration from the virtual volume to the second primary volume, t the migrating a remote copy method comprising steps for:
• relating the first identifier to the second primary volume;
• and
• configuring the remote copy pair of the second primary volume and second secondary volume.