Disk array including plural exchangeable magnetic disk unit

摘要

To provide a storage apparatus in which a plurality of drives (A0 - AA3, 2010 - 2040) in a unit (101 - 113) are separately treated and the unit can be easily exchanged for another unit even when RAID groups are freely composed. The storage apparatus includes a plurality of drive cases (10a-i) in each of which a plurality of units (101 - 113) are detachably mounted, each of the units including a plurality of drives (A0 - AA3, 2010 - 2040) that are detachably, and a controller case (19) in which a disk control section is provided, wherein the disk control section comprises a RAID group creation section for creating a RAID group using the plurality of disks and an exchange indicating section for giving a notice that a unit is ready to exchange after rebuilding or copying of data in disks included in the unit at the time of exchange of the unit. <IMAGE>