Storage system
First Claim
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1. A storage system being coupled with a computer comprising:
- a first logical volume for storing data used by said computer; and
a storage control device for controlling access to said first logical volume;
wherein said storage control device receives identification of said first logical volume, start and end addresses of a part of data stored in said first logical volume, and identification of a second logical volume for storing a copy of said part of data stored in said first logical volume from said computer; and
wherein said storage control device copies said part of data stored in said first logical volume designated by said identification of said first logical volume and said start and end addresses to said second logical volume designated by said identification of said second logical volume.
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Abstract
In a storage system, a logical volume is divided into a plurality of small areas called logical storage devices and only such an area designated by a user is made an object of remote copying or migratory copying. Also, there is provided a unit for forming a logical volume from any logical storage device of any RAID group. Thereby, the reduction of the deterioration in performance at the time of remote copying, the reduction of a storage area to be assigned to a secondary site as a copy destination, the shortening of a time required for migratory copying and the assignment of any area of a logical volume on any RAID group are enabled.
18 Citations
8 Claims
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1. A storage system being coupled with a computer comprising:
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a first logical volume for storing data used by said computer; and a storage control device for controlling access to said first logical volume; wherein said storage control device receives identification of said first logical volume, start and end addresses of a part of data stored in said first logical volume, and identification of a second logical volume for storing a copy of said part of data stored in said first logical volume from said computer; and wherein said storage control device copies said part of data stored in said first logical volume designated by said identification of said first logical volume and said start and end addresses to said second logical volume designated by said identification of said second logical volume. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A storage system being coupled with a computer comprising:
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a first logical volume for storing data used by said computer; a second logical volume for storing a copy of data stored in said first logical volume; a control device for controlling access to said first logical volume and said second logical volume; and an update bit map which shows if said control device updates data stored in said first logical volume; wherein said storage control device receives identification of said first logical volume and identification of said second logical volume from said computer; said storage control device copies data stored in said first logical volume designated by said identification of said first logical volume to said second logical volume designated by said identification of said second logical volume, wherein said storage control device updates data stored in said first logical volume in response to an update request from said computer and said storage control device copies updated data stored in said first logical volume to said second logical volume, if said storage control device receives split instruction containing said identification of said first logical volume and said identification of second logical volume from said computer, said storage control device stops copying updated data stored in said first logical volume to said second logical volume after receiving said split instruction, if said storage control device updates data stored in said first logical volume after receiving said split instruction, said storage control device updates said update bit map, and when said storage control device receives a re-synchronizing instruction containing said identification of said first logical volume, start and end addresses of a part of data stored in said first logical volume, and said identification of a second logical volume from said computer, said storage control device copies updated data stored in a part of an area of said first logical volume, said part of data is stored in said part of an area and said updated data is updated after receiving said split instruction, to said second logical volume by using said update bit map. - View Dependent Claims (8)
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Specification