Remote copy system
AssigneeHitachi, Ltd.
InventorsMasamitsu Takahashi, Toru Suzuki
Life of this patent
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Abstract
Provided is a remote copy system capable of guaranteeing the time ordering of data to be handled by a remote site even when the tasks at the remote site are operated across a plurality of storages or a plurality of volume groups. A consistency group consisting of a secondary journal volume and a replica is associated with a journal group consisting of a primary data volume, a primary journal volume, a secondary journal volume, and a secondary data volume. Upon backing up a secondary data volume and forming a replica, the host system issues a backup time reservation command to a storage apparatus, and the storage apparatus creates a replica by comparing the time stamp added to the journal data and the backup reservation time.
Claims10
A remote copy system for copying write data, which is sent from a host system to a first storage system configuring a local site, from said first storage system to a second storage system configuring a remote site,
- wherein said first storage system comprises:
- a primary data volume to which said write data is written;
- a first controller for creating journal data from said write data;
- a primary journal volume for storing the created journal data;
- and
- a second controller for transferring the journal data stored in said primary journal volume to said second storage apparatus;
- wherein said second storage system comprises:
- a secondary journal volume for storing the journal data transferred from said first storage apparatus;
- a secondary data volume corresponding to said primary data volume;
- and
- a third controller for restoring said journal data stored in said secondary journal volume to said secondary data volume, and creating a replica by backing up the data of said secondary data volume to which said journal data was restored;
- wherein said journal data is given a parameter relating to time ordering;
- and
- wherein said third controller respectively controls the status of said restoration between said secondary journal volume and said secondary data volume, and the pair status between said secondary data volume and said replica based on a first command for designating said parameter, and a second command for designating a group formed from said secondary journal volume, said secondary data volume, and said replica, which are in mutual correspondence.
A remote copy system for realizing inter-case volume replication between a primary volume of a first storage [apparatus] configuring a local site and a secondary volume of a second storage apparatus configuring a remote site,
- wherein said second storage apparatus comprises:
- a journal volume for recording journal data to be remote copied from said first storage apparatus;
- and
- a controller for restoring said journal data recorded in said journal volume to said secondary volume, subsequently resting said secondary volume by separating said secondary volume from said journal volume, and backing up said resting secondary volume to a replica;
- wherein said journal volume is allocated with a storage extent of a high-capacity storage device as a primary storage apparatus to host system I/O data in said second storage apparatus;
- and
- wherein said controller continues to nondisruptively accept said journal data remote copied from said first storage apparatus to said journal volume while said secondary volume is being separated from said journal volume, and records said journal data during that period in said journal volume.
Dependencies are inferred from the claim text.