Storage system and data management method

A storage system for managing a plurality of data centers comprising:

• a business server for executing an application in response to an input/output request;
• a first storage system of a first data center that includes a first storage area, that is configured to store data in one or more volumes in response to a request from the business server;
• and
• a management server for managing the plurality of data centers;
• and
• wherein the management server is configured to:
• rank pages of the one or more volumes of the first storage area based on tier;
• determine a second data center and a third data center from the plurality of data centers based on available resources of each of the plurality of data centers;
• determine a failover location from the plurality of data centers;
• copy all pieces of data stored in the one or more volumes of the first storage area to one or more volumes of a second storage area managed by a second storage system of the second data center;
• copy a subset of the data stored in the one or more volumes of the first storage area to one or more volumes of a third storage area managed by a third storage system of the third data center based on the rank of the page on which the data is stored and a frequency of access of the data;
• copy all pieces of data from the one or more volumes of the second storage area to the one or more volumes of the third storage area, if the first storage system of the first data center fails and the second data center is determined to be the failover location;
• copy all pieces of data from the one or more volumes of the second storage area to the one or more volumes of the third storage area, if the system of the first data center fails and the third data center is determined to be the failover location;
• and
• obtain data from the one or more volumes of the third storage area, if the data has been requested from one or more volumes of the first storage area that have not been copied.

A data management method for a storage system for managing a plurality of data centers comprising:

• executing, by a business server, an application in response to an input/output request;
• ranking pages of one or more volumes of a first storage area managed by a first storage system of a first data center based on tier;
• determining a second data center and a third data center from the plurality of data centers based on available resources of each of the plurality of data centers;
• determining a failover location from the plurality of data centers;
• copying, by a management server, all pieces of data stored in the one or more volumes of the first storage area to the one or more volumes of a second storage area managed by a second storage system of the second data center;
• determining a subset of the data stored in the one or more volumes of the first storage area based on the ranking of the page on which the data is stored;
• and
• copying, by the management server, the subset of the data stored in the one or more volumes of the first storage area to one or more volumes of a third storage area managed by a third storage system of the third data center.