| 摘要 |
A RAID apparatus and an access control method thereof includes same logical volumes allocated to a plurality of physical disk units. The RAID apparatus includes a plurality of physical disk units storing same logical volumes, and a disk controller accesses a particular logical volume by accessing any physical disk unit which stores a the particular logical volume. The disk controller includes a memory storing the number of operations requested of each physical disk unit, for each physical disk unit, and a control circuit accessing one of the plurality of physical disk units which stores the particular logical volume, in accordance with the number of operations. Since a physical disk unit is selected in accordance with the numbers of operations of the individual physical disk units, balanced access to the physical disk units is accomplished.
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