BACKUP APPARATUS, BACKUP METHOD AND BACKUP PROGRAM
First Claim
1. A backup apparatus having an address conversion table for storing, in correspondence with each other, a logical address designated by a host system and a physical address indicating a data storage position in a copy destination volume, the backup apparatus comprising:
- a sequential data count setting unit for setting sequential data count information indicating the number of data blocks in a sequence in the physical address in the address conversion table;
a sequential data information acquisition unit which, upon receiving a read request, reads the data block in the address conversion table corresponding to the leading logical address among the logical addresses requested to be read, and acquires the sequential data count information set in the address conversion table; and
a reading unit for reading a physical volume corresponding to the physical addresses in a sequence in accordance with the sequential data count information acquired by the sequential data information acquisition unit.
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Accused Products
Abstract
A backup apparatus has an address conversion table for storing, in correspondence with each other, a logical address and a physical address. The backup apparatus has a sequential data count setting unit, a sequential data information acquisition unit, and a reading unit. The sequential data count setting unit sets sequential data count information indicating the number of data blocks in a sequence in the physical address in the address conversion table. The sequential data information acquisition unit, upon receiving a read request, reads the data block in the address conversion table corresponding to the leading logical address among the logical addresses requested to be read and acquires the sequential data count information set in the address conversion table. The reading unit reads a physical volume corresponding to physical addresses in a sequence in accordance with the sequential data count information acquired by the sequential data information acquisition unit.
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Citations
12 Claims
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1. A backup apparatus having an address conversion table for storing, in correspondence with each other, a logical address designated by a host system and a physical address indicating a data storage position in a copy destination volume, the backup apparatus comprising:
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a sequential data count setting unit for setting sequential data count information indicating the number of data blocks in a sequence in the physical address in the address conversion table; a sequential data information acquisition unit which, upon receiving a read request, reads the data block in the address conversion table corresponding to the leading logical address among the logical addresses requested to be read, and acquires the sequential data count information set in the address conversion table; and a reading unit for reading a physical volume corresponding to the physical addresses in a sequence in accordance with the sequential data count information acquired by the sequential data information acquisition unit. - View Dependent Claims (2, 3, 4)
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5. A backup method using an address conversion table for storing, in correspondence with each other, a logical address designated by a host system and a physical address indicating a data storage position in a copy destination volume, the method comprising:
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setting sequential data count information indicating the number of data blocks in a sequence in the physical address; reading the data block, upon receiving a read request, in the address conversion table corresponding to a leading logical address among the logical addresses requested to be read, and acquiring the sequential data count information set in the address conversion table; and reading a physical volume corresponding to the physical addresses in a sequence in accordance with the sequential data count information acquired. - View Dependent Claims (6, 7, 8)
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9. A computer-readable recording medium encoded with a backup program using an address conversion table for storing, in correspondence with each other, a logical address designated by a host system and a physical address indicating a data storage position in a copy destination volume, and containing instructions executable on a computer, the program causing the computer to execute:
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setting, in the address conversion table, sequential data count information indicating the number of the data blocks in a sequence in the physical address; reading the data block, upon receiving a read request, in the address conversion table corresponding to a leading logical address among the logical addresses requested to be read, and acquiring the sequential data count information set in the address conversion table; and reading a physical volume corresponding to physical addresses in a sequence in accordance with the sequential data count information acquired. - View Dependent Claims (10, 11, 12)
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Specification