Patent ID: 7890791
Filing Date: 2011-02-15
Classification: G06F

Abstract:
1. A disk array device characterized by including a plurality of hard disks composing a RAID and a predetermined number of hard disks each arranged as a hot spare disk, the disk array device being characterized by comprising: a S.M.A.R.T. information reading part for reading S.M.A.R.T. information of each of the hard disks included in the disk array device; and a disk controller for, based on the S.M.A.R.T. information of each of the hard disks read by the S.M.A.R.T. information reading part, assigning a predetermined number of hard disks to the hot spare disk in descending order of failure probability of the hard disk, wherein a plurality of RAIDs each composed of the plurality of hard disks is arranged, the disk array device further comprises an access frequency obtaining part for obtaining access frequency information to each of the RAIDs, and the disk controller is configured to, based on the access frequency information to each of the RAIDs obtained by the access frequency obtaining part and the S.M.A.R.T. information of each of the hard disks read by the S.M.A.R.T. information reading part, assign hard disks with lower failure probabilities to the RAIDs in descending order of access frequency of the RAIDs and assign a predetermined number of hard disks to the hot spare disk in descending order of failure probability of the hard disks.