Data management method in storage pool and virtual volume in DKC
View Patent ↗A storage system connected to a computer and a management computer, includes storage devices accessed by the computer, and a control unit for controlling the storage devices. A first-type logical device corresponding to a storage area set in at least one of the storage devices and a second-type logical device that is a virtual storage area are provided. The control unit sets at least two of the first-type logical devices different in a characteristic as storage areas included in a storage pool through mapping. The first-type logical device stores data by allocating a storage area of the second-type logical device to a storage area of the first-type logical device mapped to the storage pool. The characteristic of the second-type logical device can be changed by changing the allocated storage area of the second-type logical device to a storage area of another first-type logical device.
1. A storage system coupled to a computer and a management computer, comprising:
storage devices accessed by the computer; and
a control unit for controlling the storage devices and external storage devices coupled to the storage system,
wherein a 1 st first-type logical device corresponding to a storage area that is set in at least one of the storage devices and a 2 nd first-type logical device different in an access characteristic and corresponding to a storage area that is set in at least one of the external storage device, and a second-type logical device that is a virtual storage area are provided,
wherein the control unit:
sets at least two of the first-type logical devices as storage areas included in a storage pool through mapping;
sets the second-type logical device to be accessible by the computer if the storage area of the second type logical device is allocated in response to access to the second-type logical device from the computer;
allocates the storage area of the second-type logical device to the storage area of the 1 st first-type logical device if the second-type logical device is not allocated in response to access to the second-type logical device is not allocated in response to access to the second-type device from the computer; and
changes the access characteristic of the second-type logical device by changing the allocated storage area of the second-type logical device to a storage area of the 2nd first-type logical device based on static information for the storage pool.
2. The storage system according to claim 1 , further comprising:
a primary storage system; and
a secondary storage system that is externally connected to the primary storage system,
wherein the 1st first-type logical device includes a storage area of a storage device provided for the primary storage system, and
wherein the 2nd first-type logical device includes a storage area of a storage device provided for the secondary storage system.
3. The storage system according to claim 1 , wherein the 2nd first-type logical device includes a storage area of a storage device using a tape type recording medium.
4. The storage system according to claim 1 , wherein the 2nd first-type logical device includes a storage area of a storage device connected via an ATA interface.
5. The storage system according to claim 1 , wherein the 2nd first-type logical device includes a storage area of a storage device connected via a Fibre Channel interface.
6. The storage system according to claim 1 , wherein the 2nd first-type logical device includes a storage area that stores data divided into predetermined size in sequential storage areas.
7. The storage system according to claim 1 , wherein the 1st first-type logical device includes a storage area that provides a parallel access to data divided into predetermined size.
8. The storage system according to claim 1 , wherein the control unit further:
copies data stored in the 1st first-type logical device allocated to the storage area of the second-type logical device to the 2nd first-type logical device; and
releases the allocation of the storage area of the second-type logical device to the storage area of the 1st first-type logical device.
9. The storage system according to claim 1 ,
wherein the 1st first-type logical device stores data divided into a predetermined size in a storage area accessible in parallel, and the 2nd first-type logical device stores data divided into a predetermined size in sequential storage areas,
wherein the control unit further:
copies data stored in the 1st first-type logical device allocated to the storage area of the second-type logical device to the 2nd first-type logical device; and
releases the allocation of the storage area of the second-type logical device to the storage area of the 1st first-type logical device.
10. The storage system according to claim 1 , wherein the control unit:
copies data stored in the 1st first-type logical device allocated to the storage area of the second-type logical device to the 2nd first-type logical device that is not set as the memory area of the storage pool; and
releases the allocation of the storage area of the second-type logical device to the storage area of the 1st first-type logical device.
11. The storage system according to claim 1 , comprising:
a primary storage system; and
a secondary storage system externally connected to the primary storage system,
wherein the 1st first-type logical is constituted of the storage device is provided in the primary storage system, and the 2nd first-type logical device is constituted of the storage device provided in the secondary storage system,
wherein the control unit changes the characteristic of a part of the storage area of the second-type logical device by, without releasing the allocation of the storage area of the second-type logical device to the storage area of the 1st first-type logical device, further allocating the storage area of the second-type logical device to the storage area of the 2nd first-type logical device.