Patent ID: 8402235
Filing Date: 2013-03-19
Classification: G06F

Abstract:
1. A backup apparatus comprising: a memory to store a logical address designated by a host system and a physical address indicating a data storage position in a copy destination volume in correspondence with each other, and a processor to execute a process including: setting sequential address count information in the memory, the sequential address count information indicating the number of physical addresses in a sequence; upon receiving a read request, reading the physical address in the memory corresponding to a leading logical address among the logical addresses requested to be read, and acquiring the sequential address count information set in the memory; and reading a physical volume corresponding to the physical addresses in a sequence in accordance with the sequential address count information acquired, the setting the sequential address count information includes: when a last assigned logical address to the memory and a logical address presently assigned to the memory make up a sequence, setting the sequential address count information as a sequence of the physical address corresponding to the last assigned logical address to the memory and the physical address corresponding to the logical address presently assigned to the memory.