Data processing system
A data processing system has a plurality of storage systems. In this system, data replication is performed at high speed and efficiency while maintaining data integrity. In addition, when failure has occurred in a configuration element, the time necessary to resume the data replication is reduced. In accordance with an instruction from first host computer, updating of replication-target data and creation of a journal are performed in a storage system A; and updating of replication data and creation of a journal are performed in a storage system B. A storage system C retrieves a journal from the storage system B in asynchronization with the updating, and performs updating of replication data. When failure has occurred in the storage system B, a journal-retrieving end is altered to the storage system, and the replication data is updated in accordance with the retrieved journal.
1. A storage system comprising:
a first storage system including a first volume;
a second storage system including a second volume; and
a third storage system including a third volume,
wherein the first volume functions as a first primary volume storing data received from a first host computer, the second volume functions as a first secondary volume which is paired with the first volume and stores data received from the first storage system, and the third volume functions as a second secondary volume which is paired with the second volume and stores data received from the second storage system, and
wherein, if a first host computer has a failure, the second volume functions as a second primary volume storing data received from a second host computer, the first volume functions as a third secondary volume which is paired with the second volume and stores data received from the second storage system, and the third volume functions as a fourth secondary volume which is paired with the second volume and stores data received from the second storage system.
2. The storage system according to claim 1 , wherein the first primary volume and the first secondary volume form a synchronous copy pair.
3. The storage system according to claim 1 , wherein the first secondary volume and the second secondary volume form an asynchronous copy pair.
4. The storage system according to claim 1 , wherein the second primary volume and the third secondary volume form an asynchronous copy pair.
5. The storage system according to claim 1 , wherein the second primary volume and the fourth secondary volume form an asynchronous copy pair.
6. A copy method for a storage system including a first storage system having a first volume, a second storage system having a second volume, and a third storage system having a third volume, the copy method comprising:
providing the first volume which functions as a first primary volume storing data received from a first host computer;
providing the second volume which functions as a first secondary volume which is paired with the first volume and stores data received from the first storage system;
providing the third volume which functions as a second secondary volume which is paired with the second volume and stores data received from the second storage system;
if the first host computer has a failure, executing the steps of providing the second volume which functions as a second primary volume storing data received from a second host computer;
providing the first volume which functions as a third secondary volume which is paired with the second volume and stores data received from the second storage system; and
providing the third volume which functions as a fourth secondary volume which is paired with the second volume and stores data received from the second storage system.
7. The copy method according to claim 6 , wherein the first primary volume and the first secondary volume is a synchronous copy pair.
8. The copy method according to claim 6 , wherein the first secondary volume and the second secondary volume form an asynchronous copy pair.
9. The copy method according to claim 6 , wherein the second primary volume and the third secondary volume form an asynchronous copy pair.
10. The copy method according to claim 6 , wherein the second primary volume and the fourth secondary volume is an asynchronous copy pair.
11. A computer program stored in a computer readable storage medium and executable by a storage system including a first storage system having a first volume, a second storage system having a second volume, and a third storage system having a third volume, the computer program comprising:
code for providing the first volume which functions as a first primary volume storing data received from a first host computer;
code for providing the second volume which functions as a first secondary volume which is paired with the first volume and stores data received from the first storage system;
code for providing the third volume which functions as a second secondary volume which is paired with the second volume and stores data received from the second storage system;
code, if the first host computer has a failure, for executing the steps of providing the second volume which functions as a second primary volume storing data received from a second host computer;
providing the first volume which functions as a third secondary volume which is paired with the second volume and stores data received from the second storage system, and
providing the third volume which functions as a fourth secondary volume which is paired with the second volume and stores data received from the second storage system.
12. The computer program according to claim 11 , wherein the first primary volume and the first secondary volume is a synchronous copy pair.
13. The computer program according to claim 11 , wherein the first secondary volume and the second secondary volume form an asynchronous copy pair.
14. The computer program according to claim 11 , wherein the second primary volume and the third secondary volume form an asynchronous copy pair.
15. The computer program according to claim 11 , wherein the second primary volume and the fourth secondary volume is an asynchronous copy pair.