Data processing system
First Claim
1. A data processing system comprising:
- a first storage system that is configured to couple to a host device and configured to send and receive data to and from the host device;
a second storage system that is coupled to the first storage system and configured to receive data from the first storage system; and
a third storage system that is coupled to the first storage system and configured to receive data from the first storage system, whereinthe first storage system includes a first storage area that is configured to store data written from the host device, and a second storage area that is configured to store the data written from the host device and update information relating to a write order of the data,the first storage system is configured to transmit the data to the second storage system synchronously with receiving the data from the host device, and transmit the data and the update information relating to the write order of the data to the third storage system asynchronously with receiving the data from the host device,the second storage system includes a third storage area that is configured to store the data received from the first storage system, and a fourth storage area that is configured to store the data received from the first storage system and update information relating to the write order of the data in order to transmit the data and the update information stored in the fourth storage area to the third storage system in case of failure of the first storage system,the third storage system includes a fifth storage area that is configured to store the data and the update information read from the second storage area, and a sixth storage area that is configured to store the data included in the fifth storage area according to the update information included in the fifth storage area, andthe third storage system is configured to write the data and the update information received from the first storage system in the fifth storage area, and write the data stored in the fifth storage area in the sixth storage area according to the update information stored in the fifth storage area.
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Accused Products
Abstract
A data processing system includes at least a first storage system, a second storage system and a third storage system. The third storage system maintains a replication of data stored in the first storage system. When updating data in the first storage system, the first storage system updates the replication of data stored in the third storage system and creates a journal. The journal is formed from a copy of data used for update and update information such as a write command for update, etc. The second storage system also maintains a replication of data stored in the first storage system. The second storage system obtains the journal, and updates data stored therein corresponding to data stored in the first storage system in the order of data update performed in the first storage system. When updating data stored in the third storage system corresponding to data stored in the first storage system, the third storage system creates a journal using data update numbers created in the first storage system. When the first storage system fails, the second storage system obtains the journal from the third storage system, and updates data stored therein corresponding to data stored in the first storage system in the order of data update performed in the first storage system.
172 Citations
19 Claims
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1. A data processing system comprising:
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a first storage system that is configured to couple to a host device and configured to send and receive data to and from the host device; a second storage system that is coupled to the first storage system and configured to receive data from the first storage system; and a third storage system that is coupled to the first storage system and configured to receive data from the first storage system, wherein the first storage system includes a first storage area that is configured to store data written from the host device, and a second storage area that is configured to store the data written from the host device and update information relating to a write order of the data, the first storage system is configured to transmit the data to the second storage system synchronously with receiving the data from the host device, and transmit the data and the update information relating to the write order of the data to the third storage system asynchronously with receiving the data from the host device, the second storage system includes a third storage area that is configured to store the data received from the first storage system, and a fourth storage area that is configured to store the data received from the first storage system and update information relating to the write order of the data in order to transmit the data and the update information stored in the fourth storage area to the third storage system in case of failure of the first storage system, the third storage system includes a fifth storage area that is configured to store the data and the update information read from the second storage area, and a sixth storage area that is configured to store the data included in the fifth storage area according to the update information included in the fifth storage area, and the third storage system is configured to write the data and the update information received from the first storage system in the fifth storage area, and write the data stored in the fifth storage area in the sixth storage area according to the update information stored in the fifth storage area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A data processing system comprising:
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a first storage system that is configured to couple to a host device and configured to send and receive data to and from the host device; a second storage system that is coupled to the first storage system and configured to receive data from the first storage system; and a third storage system that is coupled to the first storage system and configured to receive data from the first storage system, wherein the first storage system includes a plurality of first storage areas that are configured to store data written from the host device, and a second storage area that is configured to store the data written from the host device to the plurality of first storage areas and update information relating to a write order of the data written from the host device to the plurality of first storage areas, the first storage system is configured to transmit the data written from the host device to the plurality of first storage areas to the second storage system synchronously with receiving the data from the host device, and transmit the data written from the host device to the plurality of first storage areas and the update information to the third storage system asynchronously with receiving the data from the host device, the second storage system includes a plurality of third storage areas that are configured to store the data received from the first storage system, and a fourth storage area that is configured to store the data received from the first storage system and update information relating to the write order of the data in order to transmit the data and the update information stored in the fourth storage area to the third storage system in case of failure of the first storage system, the third storage system includes a fifth storage area that is configured to store the data and the update information read from the second storage area, and a plurality of sixth storage areas that are configured to store the data included in the fifth storage area according to the update information included in the fifth storage area, and wherein data stored in the fifth storage area is written in the plurality of sixth storage areas according to the update information stored in the fifth storage area.
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Specification