| 摘要 |
A primary storage system manages a source storage volume. A source journal volume stores a plurality of journals each including a sequence number and data stored in the source storage volume. Plural secondary storage systems manage destination journal volumes and a destination storage volume. A computer system comprises: a memory; and a processor configured to receive, from each secondary storage system, a bitmap indicative of a status as to whether each of the journals is stored in each of the destination journal volumes in said each secondary storage system and a hash value of each journal which is stored in each of the destination journal volumes in said each secondary storage system; determine, based on the received bitmaps and hash values for the secondary storage systems, a range of one or more journals which can be reflected from the destination journal volumes to the destination storage volume without collision. |
