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 and a second journal volume configured by a plurality of storage devices in the third storage system,wherein, when the original volume is updated with 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 temporarily stored in the first journal volume,wherein, in response to a request received from the third storage system for a transmission of the journal data, the second storage system sends the journal data to the third storage system,wherein the third storage system temporarily stores the journal data sent by the second storage system in the second journal volume and updates the second logical volume with the write data based on the journal data in the second journal volume.
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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
10 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 and a second journal volume configured by a plurality of storage devices in the third storage system, wherein, when the original volume is updated with 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 temporarily stored in the first journal volume, wherein, in response to a request received from the third storage system for a transmission of the journal data, the second storage system sends the journal data to the third storage system, wherein the third storage system temporarily stores the journal data sent by the second storage system in the second journal volume and updates the second logical volume with the write data based on the journal data in the second journal volume. - View Dependent Claims (2, 3, 4, 5)
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6. A remote copy method in a system including 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 and a second journal volume configured by a plurality of storage devices in the third storage system, the remote copy method comprising the steps of:
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when the original volume is updated with write data, updating the first logical volume with the write data and temporarily storing journal data including the write data and update information corresponding to the write data in the first journal volume, in response to a request received from the third storage system for a transmission of the journal data, sending, by the second storage system, the journal data to the third storage system, temporarily storing, by the third storage system, the journal data sent by the second storage system in the second journal volume and updating, by the third storage system, the second logical volume with the write data based on the journal data in the second journal volume. - View Dependent Claims (7, 8, 9, 10)
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Specification