Patent ID: 7565575
Filing Date: 2009-07-21
Classification: G06F

Abstract:
1. A method of repairing a disk group comprising a plurality of disks, the method comprising: determining a threshold value for a repair time of the disk group, wherein the threshold value represents a duration during which a hard disk failure should be assumed to be transient; maintaining a set of metadata for each hard disk in the disk group, wherein each hard disk stores a set of data blocks, each data block comprising a set of data stored on the hard disk, and wherein the set of metadata for a hard disk comprises information about whether each of the data blocks on the hard disk is current; identifying with a computer a first hard disk in the disk group that has become unavailable, wherein the first hard disk comprises a first set of data blocks; marking as stale, in the set of metadata for the first hard disk, each data block on the first hard disk to which a write attempt is made while the offline disk is unavailable; and repairing the disk group, wherein repairing the disk group comprises: