STORAGE SYSTEM AND DATA MANAGEMENT METHOD

摘要

Fault-tolerance is improved by duplicating data and update information of that data. A storage system has a first storage apparatus that is connected to a host computer, and includes a plurality of first data volumes and a first journal volume, a second storage apparatus that is connected to the host computer and the first storage apparatus, and includes a plurality of second data volumes for storing duplicated data of each of the plurality of first data volumes, and a second journal volume for storing the duplicated data of the first journal volume, a third storage apparatus that is connected to the first storage apparatus, and includes a plurality of third data volumes that configure a remote copy pair with the plurality of first data volumes by using the journal data received from the first storage apparatus, and a fourth storage apparatus that is connected to the third storage apparatus.

主权项

1. A storage system, comprising:
a first storage apparatus that is connected to a host computer, and includes a plurality of first data volumes for storing data, and a first journal volume for storing journal data including data to be written into the plurality of first data volumes and an update number indicating an order in which the data was written; a second storage apparatus that is connected to the host computer and the first storage apparatus, and includes a plurality of second data volumes for storing duplicated data of each of the plurality of first data volumes, and a second journal volume for storing the duplicated data of the first journal volume; a third storage apparatus that is connected to the first storage apparatus, and includes a plurality of third data volumes that configure a remote copy pair with the plurality of first data volumes by using the journal data received from the first storage apparatus; and a fourth storage apparatus that is connected to the third storage apparatus, and includes a plurality of fourth data volumes for storing duplicated data of each of the plurality of third data volume, wherein the first storage apparatus assigns a virtual volume identifier to each of the plurality of first data volumes and provides a plurality of virtual volumes to the host computer, the second storage apparatus assigns the same virtual volume identifier to one of the plurality of second data volumes storing one duplicated data of the plurality of first data volumes and provides a virtual volume to the host computer, and when a failure occurs in any one of the plurality of first data volumes of the first storage apparatus or in any one of the plurality of second data volumes of the second storage apparatus, the update information is subject to duplicate management in a continuous manner in the first journal volume of the first storage apparatus and the second journal volume of the second storage apparatus.