| 摘要 |
PROBLEM TO BE SOLVED: To realize further quick access about a disk array unit which divides a disk constituting a RAID into physical stripes and conducting access processing. SOLUTION: This disk array unit consists of a storing means for storing the correspondence relation between a logical stripe allocated to the RAID and a physical stripe linked with the RAID, a specifying means for specifying a logical stripe indicated by the address of an access request, a performing means for specifying the physical stripe linked with the logical stripe specified by the specifying means according to the correspondence relation stored by the storing means and conducting access processing, a counting means for counting the number of accessing times to the logical stripe specified by the specifying means, and a changing means for switching data between physical stripes according to the number of accessing times counted by the counting means and also changing the correspondence relation stored in the storing means in accordance with the data switching.
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