Patent ID: 7913039
Filing Date: 2011-03-22
Classification: G06F

Abstract:
1. A storage system comprising: a plurality of disk apparatuses configuring a plurality of RAID groups including a first RAID group; a spare disk apparatus; and a controller is adapted to copy data stored in a disk apparatus, whose error count exceeds a first threshold, to said spare disk apparatus; wherein, if an error count of a first disk apparatus included in said first RAID group exceeds a second threshold which is lower than said first threshold, said controller is adapted to check error counts of other disk apparatuses included in said first RAID group, and wherein if any of said error counts of said other disk apparatuses included in said first RAID group exceeds said second threshold, said controller is adapted to change a value of said first threshold with respect to said first disk apparatus and said other disk apparatuses included in said first RAID group.