Data replication among storage systems
First Claim
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1. A remote copy system comprising:
- a first storage system coupled to a host computer and having an original volume configured by a plurality of storage devices in the first storage system;
a second storage system coupled to the first storage system and having a first logical volume and a first journal volume configured by a plurality of storage devices in the second storage system; and
a third storage system coupled to the second storage system and having a second logical volume configured by a plurality of storage devices in the third storage system,wherein, when the original volume is updated with a write data, the first logical volume is updated with the write data and journal data including the write data and update information corresponding to the write data is written to the first journal volume,wherein, in response to a request for a transmission of the journal data received from the third storage system, the second storage system sends the journal data to the third storage system and the third storage system updates the second logical volume with the write data based on the journal data.
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Abstract
A first storage system stores information relating to the updating of data stored in that system as a journal. More specifically, the journal is composed of a copy of data that was used for updating and update information such as a write command used during updating. Furthermore, the second storage system acquires the journal via a communication line between the first storage system and the second storage system. The second storage system holds a duplicate of the data held by the first storage system and updates the data corresponding to the data of the first storage system in the data update order of the first storage system by using the journal.
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Citations
12 Claims
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1. A remote copy system comprising:
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a first storage system coupled to a host computer and having an original volume configured by a plurality of storage devices in the first storage system; a second storage system coupled to the first storage system and having a first logical volume and a first journal volume configured by a plurality of storage devices in the second storage system; and a third storage system coupled to the second storage system and having a second logical volume configured by a plurality of storage devices in the third storage system, wherein, when the original volume is updated with a write data, the first logical volume is updated with the write data and journal data including the write data and update information corresponding to the write data is written to the first journal volume, wherein, in response to a request for a transmission of the journal data received from the third storage system, the second storage system sends the journal data to the third storage system and the third storage system updates the second logical volume with the write data based on the journal data. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A remote copy method in a system having a first storage system coupled to a host computer and having an original volume configured by a plurality of storage devices in the first storage system;
- a second storage system coupled to the first storage system and having a first logical volume and a first journal volume configured by a plurality of storage devices in the second storage system; and
a third storage system coupled to the second storage system and having a second logical volume configured by a plurality of storage devices in the third storage system, the method comprising the steps of;when the original volume in the first storage system is updated with a write data, updating the first logical volume in the second storage system with the write data; writing journal data including the write data and update information corresponding to the write data to the first journal volume in the second storage system; receiving, by the second storage system, a request for a transmission of the journal data from the third storage system; sending, by the second storage system, the journal data to the third storage system; and updating, by the third storage system, the second logical volume in the third storage system with the write data based on the journal data. - View Dependent Claims (8, 9, 10, 11, 12)
- a second storage system coupled to the first storage system and having a first logical volume and a first journal volume configured by a plurality of storage devices in the second storage system; and
Specification