Computer system for remote copy

A computer system, comprising:

• a primary storage system and a secondary storage system each comprising a disk controller which controls data read/write in a disk drive;
• and
• a host computer which transmits a request to the primary storage system, wherein:
• the disk controller has a control unit and a storage unit;
• the disk drive has logical volumes which are data storing areas, and a logical volume of the primary storage system and a logical volume of the secondary storage system forming a copy pair;
• the host computer sends a request to delete the copy pair and attribute information of the logical volumes that constitute the copy pair;
• the control unit:
• deletes a copy pair in accordance with the received request;
• stores, in the storage unit, the received attribute information in association with the logical volumes that have formed the deleted copy pair;
• and
• decides to execute a following request which is made by the host computer to the logical volumes in a case where the request meets the attribute information corresponding to the logical volumes and is stored in the storage unit.

A computer system, comprising:

• a primary storage system and a secondary storage system each comprising a disk controller which controls data read/write in a disk drive;
• and
• a host computer which transmits a request to the primary storage system, wherein:
• the disk drive has logical volumes which are data storing areas, and a logical volume of the primary storage system and a logical volume of the secondary storage system forming a copy pair,
• the host computer has a management module which creates a request to delete the copy pair and attribute information of the logical volumes that constitute the copy pair, and sends the request and the attribute information to the disk controller of the primary storage system, and
• the disk controller includes:
• a reception module which receives the request and the attribute information sent from the management module;
• a copy processing module which executes, in accordance with the received request, deletion of the copy pair constituted of the logical volumes;
• and
• an attribute information checking module which stores, in a disk unit, the received attribute information in association with the logical volumes that have formed the deleted copy pair, and which decides to execute a following request which is made by the host computer to the logical volumes in a case where the request meets the attribute information corresponding to the logical volumes and is stored in the storage unit.

A host computer connected to a computer system to send a request to the computer system, the computer system having a primary storage system and a secondary storage system each of which comprises a disk controller which controls data read/write in a disk drive, the host computer comprising a host control module and a host storage unit, wherein:

• the disk drive has logical volumes which are data storing areas, and a logical volume of the primary storage system and a logical volume of the secondary storage system forming a copy pair;
• the host storage unit stores information of the copy pair constituted of the logical volumes;
• and
• when the host computer requests deletion of the copy pair, the host control module:
• obtains, from the host storage unit, information of the copy pair requested to be deleted;
• identifies logical volumes that constitute the copy pair from the obtained copy pair information;
• sets attribute information of the logical volumes for when the copy pair is deleted;
• and
• sends the copy pair deletion request and the set attribute information to the disk controller.

A copy pair processing method of controlling a computer system to execute copy pair processing, the computer system having a primary storage system and a secondary storage system each of which has a disk controller which controls data read/write in a disk drive, the disk drive having logical volumes which are data storing areas, a logical volume of the primary storage system being paired with a logical volume of the secondary storage system to form a copy pair, the method comprising the steps of:

• sending a request to delete the copy pair and attribute information of the logical volumes that constitute the copy pair;
• executing copy pair deletion in accordance with the received request;
• storing, in a storage unit of the disk controller, the received attribute information in association with the logical volumes that have formed the deleted copy pair;
• and
• deciding to execute a following request which is made by the host computer to the logical volumes in a case where the request meets the attribute information corresponding to the logical volumes and is been stored in the storage unit.