Storage apparatus and storage apparatus migration method

A storage system coupled to a host computer for migrating a source remote copy configuration in a source storage system to a destination storage system as a destination remote copy configuration, the storage system comprising:

• the source storage system including the source remote copy configuration comprised of a primary volume provided by a source primary storage apparatus and a secondary volume provided by a source secondary storage apparatus;
• and
• the destination storage system, coupled to the source storage system, including a primary volume provided by a destination primary storage apparatus and a secondary volume provided by a destination secondary storage apparatus so that the primary volume of the destination primary storage apparatus and the secondary volume of the destination secondary storage apparatus are able to configure the destination remote copy configuration,
• wherein the destination primary storage apparatus is configured to:
• define a virtual volume which is mapped to the primary volume provided by the source primary storage apparatus for storing data in the primary volume provided by the source primary storage apparatus;
• take over a first identifier of the primary volume of the source primary storage apparatus to the virtual volume, the first identifier provided for the host computer as an identifier of the virtual volume;
• and
• transfer, when the destination primary storage apparatus receives an access request to the virtual volume from the host computer, the access request to the source primary storage apparatus for accessing data in the primary volume provided by the source primary storage apparatus,
• wherein the destination secondary storage apparatus is configured to take over a second identifier of the secondary volume of the source secondary storage apparatus, to the secondary volume of the destination secondary storage apparatus as an identifier of the secondary volume of the destination secondary storage apparatus,
• wherein the destination primary storage apparatus of the destination storage system and the destination secondary storage apparatus of the destination storage system are configured to:
• form a remote copy pair between the virtual volume associated with the first identifier and the secondary volume associated with the second identifier;
• and
• copy data in the primary volume of the source primary storage apparatus to the secondary volume of the destination secondary storage apparatus, the primary volume of the destination primary apparatus being a storage area of the virtual volume;
• wherein the destination primary storage apparatus is configured to:
• form a volume migration pair between the primary volume of the destination primary storage apparatus and the virtual volume associated with the first identifier;
• and
• migrate data stored in the primary volume of the source primary storage apparatus into the primary volume of the destination primary storage apparatus, the primary volume of the destination secondary storage apparatus being a storage area of the virtual volume,
• wherein, after completion of the copy of data stored in the primary volume of the source primary storage apparatus to the primary volume of the destination primary storage apparatus and completion of the migration of data stored in the primary volume of the source primary storage apparatus to the secondary volume of the destination secondary storage apparatus, the destination primary storage apparatus is configured to:
• take over the first identifier from the virtual volume to the primary volume of the destination primary storage apparatus;
• and
• provide the destination remote copy configuration between the primary volume of the destination primary storage apparatus and the secondary volume of the destination secondary storage apparatus, and
• wherein, when the destination primary storage apparatus of the destination storage system receives a write request from the host computer, the destination primary storage apparatus is configured to:
• write data related to the write request to the primary volume of the destination primary storage apparatus;
• and
• copy the data between the primary volume provided by the destination primary storage apparatus and the secondary volume provided by the destination secondary storage apparatus which comprise the destination remote copy configuration.

A remote copy configuration migration method for migrating a source remote copy configuration in a source storage system to a destination storage system as a destination remote copy configuration, the remote copy configuration migration method comprising:

• defining a virtual volume which is mapped to a primary volume provided by the source storage system for storing data in the primary volume of the source storage system;
• taking over a first identifier of the primary volume of the source storage system to the virtual volume, the first identifier provided for a host computer as an identifier of the virtual volume;
• transferring, when the source storage system receives an access request to the virtual volume from the host computer, the access request to the source storage system for accessing data in the primary volume of the source storage system;
• taking over a second identifier of the secondary volume of the source storage system, to the secondary volume of the destination storage system as an identifier of the secondary volume of the destination storage system;
• forming a remote copy pair between the virtual volume associated with the first identifier and the secondary volume associated with the second identifier;
• copying data in the primary volume of the source storage system to the secondary volume of the destination storage system, the primary volume of the destination primary apparatus being a storage area of the virtual volume;
• configuring a volume migration pair between the primary volume of the destination storage system and the virtual volume associated with the first identifier;
• and
• migrating data stored in the primary volume of the source storage system into the primary volume of the destination storage system, the primary volume of the destination storage system being a storage area of the virtual volume,
• wherein, after both completion of the copy of data stored in the primary volume of the source storage system to the primary volume of the destination storage system and completion of the migration of data stored in the primary volume of the source storage system to the secondary volume of the destination storage system, the remote copy configuration migration method further comprises:
• taking over the first identifier from the virtual volume to the primary volume of the destination storage system;
• and
• forming the destination remote copy configuration between the primary volume of the destination storage system and the secondary volume of the destination storage system, and
• wherein, when the destination storage system receives a write request from the host computer, the remote copy configuration migration method further comprises:
• writing data related to the write request to the primary volume of the destination storage system;
• and
• copying the data between the primary volume of the destination storage system and the secondary volume of the secondary storage system which comprise the destination remote copy configuration.

A destination storage system coupled to a host computer for migrating a source remote copy configuration in a source storage system to a destination storage system as a destination remote copy configuration, the storage system comprising:

• the source storage system including the source remote copy configuration comprised of a primary volume provided by a source primary storage apparatus and a secondary volume provided by a source secondary storage apparatus;
• and
• the destination storage system, coupled to the source storage system, including a primary volume provided by a destination primary storage apparatus and a secondary volume provided by a destination secondary storage apparatus so that the primary volume of the destination primary storage apparatus and the secondary volume of the destination secondary storage apparatus are able to configure the destination remote copy configuration,
• wherein the destination primary storage apparatus is configured to:
• define a virtual volume which is mapped to the primary volume provided by the source primary storage apparatus for storing data in the primary volume provided by the source primary storage apparatus;
• take over a first identifier of the primary volume of the source primary storage apparatus to the virtual volume, the first identifier provided for the host computer as an identifier of the virtual volume;
• and
• transfer, when the destination primary storage apparatus receives an access request to the virtual volume from the host computer, the access request to the source primary storage apparatus for accessing data in the primary volume provided by the source primary storage apparatus,
• wherein the destination secondary storage apparatus is configured to take over a second identifier of the secondary volume of the source secondary storage apparatus, to the secondary volume of the destination secondary storage apparatus as an identifier of the secondary volume of the destination secondary storage apparatus,
• wherein the destination primary storage apparatus of the destination storage system and the destination secondary storage apparatus of the destination storage system are configured to:
• form a remote copy pair between the virtual volume associated with the first identifier and the secondary volume associated with the second identifier;
• and
• copy data in the primary volume of the source primary storage apparatus to the secondary volume of the destination secondary storage apparatus, the primary volume of the destination primary apparatus being a storage area of the virtual volume;
• wherein the destination primary storage apparatus is configured to:
• configure a volume migration pair between the primary volume of the destination primary storage apparatus and the virtual volume associated with the first identifier;
• and
• migrate data stored in the primary volume of the source primary storage apparatus into the primary volume of the destination primary storage apparatus, the primary volume of the destination secondary storage apparatus being a storage area of the virtual volume,
• wherein, after completion of the copy of data stored in the primary volume of the source primary storage apparatus to the primary volume of the destination primary storage apparatus and completion of the migration of data stored in the primary volume of the source primary storage apparatus to the secondary volume of the destination secondary storage apparatus, the destination primary storage apparatus is configured to:
• take over the first identifier from the virtual volume to the primary volume of the destination primary storage apparatus;
• and
• form the destination remote copy configuration between the primary volume of the destination primary storage apparatus and the secondary volume of the destination secondary storage apparatus, and
• wherein, when the destination primary storage apparatus of the destination storage system receives a write request from the host computer, the destination primary storage apparatus is configured to:
• write data related to the write request to the primary volume of the destination primary storage apparatus;
• and
• copy the data between the primary volume provided by the destination primary storage apparatus and the secondary volume provided by the destination secondary storage apparatus which comprise the destination remote copy configuration.