Data Management Method in Storage Pool and Virtual Volume in DKC

A storage system comprising:

• a first storage apparatus coupled to a computer;
• and
• a second storage apparatus coupled to the first storage apparatus and the computer, wherein:
• the first storage apparatus includes:
• a first physical storage device accessed by the computer;
• and
• a first control unit for controlling the first physical storage device;
• and
• the second storage system includes:
• a second physical storage device;
• and
• a second control unit for controlling the second physical storage device, wherein:
• a first logical device which corresponds to a storage area that is set in at least one of the first physical storage devices and a second logical device that is a virtual storage device, wherein:
• the first control unit transmits system constitution information of the storage system to the second storage apparatus;
• the second control unit constitutes a third logical device and a fourth logical device based on the constitution information;
• the third logical device corresponds to a storage area that is set in at least one of the second physical storage devices;
• and
• the fourth logical device is the virtual storage device, wherein:
• when write data to the second logical device from the computer is received:
• the first control unit:
• allocates a certain storage area of the second logical device for each storage area of the first logical device and the third logical device;
• stores the write data to the allocated storage area of the first logical device;
• and
• transmits the write data to the second storage apparatus;
• and
• the second control unit:
• stores the write data to the allocated storage area of the third logical device.

A method comprising:

• providing a first storage apparatus coupled to a computer;
• accessing, by the computer, a first physical storage device included in the first storage apparatus;
• controlling, by a first control unit included in the first storage apparatus, the first physical storage device;
• providing a second storage apparatus coupled to the first storage apparatus and the computer, wherein the second storage apparatus includes a second physical storage device and a second control unit;
• controlling, by the second control unit, the second physical storage device;
• providing a first logical device which corresponds to a storage area that is set in at least one of the first physical storage devices and a second logical device that is a virtual storage device;
• transmitting, by the first control unit, system constitution information of the storage system to the second storage apparatus;
• constituting, by the second control unit, a third logical device and a fourth logical device based on the constitution information, wherein the third logical device corresponds to a storage area that is set in at least one of the second physical storage devices and wherein the fourth logical device is the virtual storage device;
• when write data to the second logical device from the computer is received, allocating, by the first control unit, a certain storage area of the second logical device for each storage area of the first logical device and the third logical device;
• storing, by the first control unit, the write data to the allocated storage area of the first logical device;
• transmitting, by the first control unit, the write data to the second storage apparatus;
• and
• storing, by the second control unit, the write data to the allocated storage area of the third logical device.