Raid apparatus storing a plurality of same logical volumes on different disk units

摘要

Disclosed is a RAID apparatus having a plurality of same logical volumes allocated on a real volume. The real volume is so designed that a plurality of same logical volumes are respectively allocated on different physical disk units and a combination of a plurality of logical volumes allocated on each physical disk unit differs from one physical disk unit to another. This structure prevents uneven loading on the real volume from occurring due to uneven loads on the logical volumes.