| 摘要 |
During the normal operation state of a computer system 1000 , the data stored in a primary storage system 200 P is copied to an intermediate storage system 200 I via synchronous copying and the data stored in the intermediate storage system 200 I is copied to a secondary storage system 200 R via asynchronous copying. During the reverse operation state, however, the data stored in the secondary storage system 200 R is copied to the intermediate storage system 200 I via asynchronous copying and the data stored in the intermediate storage system 200 I is copied to the primary storage system 200 P via synchronous copying. In this way, practical remote copying can be carried out in a computer system in which three or more storage devices are installed at different locations and connected serially.
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