Patent ID: 9164838
Filing Date: 2015-10-20
Classification: G06F,G11C

Abstract:
1. A disk array device comprising: a plurality of hard disks among which a RAID group is set up, the RAID group having a plurality of volumes; a used-area setting unit that sets up one or a plurality of used areas in the RAID groups; a diagnosis subject determination unit that, when the size of the used area that is the smallest among the used areas set in the RAID groups is greater than or equal to the size of unused area in the RAID group, determines whether a number of volumes set in the RAID group is smaller than a predetermined threshold, that obtains the ratio of unused areas to all of the areas in the RAID group when the number of volumes set in the RAID group is smaller than the predetermined threshold, that determines whether the unused area in the RAID group have a size smaller than a predetermined size when the obtained ratio is greater than or equal to a predetermined value, and that designates all of the areas in the RAID group as areas which are subject to a diagnosis when the unused area in the RAID group have a size greater than or equal to the predetermined size; and a diagnosis execution unit that executes a cyclical diagnosis on the areas determined, by the diagnosis subject determination unit, to be areas which are subject to a diagnosis.