The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 2009
Filed:
Apr. 29, 2005
Atul Goel, Santa Clara, CA (US);
Tomislav Grcanac, San Jose, CA (US);
Stephen H. Strange, Mountain View, CA (US);
Rajesh Sundaram, Mountain View, CA (US);
Atul Goel, Santa Clara, CA (US);
Tomislav Grcanac, San Jose, CA (US);
Stephen H. Strange, Mountain View, CA (US);
Rajesh Sundaram, Mountain View, CA (US);
Network Appliance, Inc., Sunnyvale, CA (US);
Abstract
A method and system for recovering data from a 'sick' disk are described. One embodiment of the invention relates to a RAID-based storage system that predicts the failure of a disk (e.g., a 'sick' disk) in a RAID disk group. Accordingly, the storage system allocates a target disk, selected from several spare disks, to replace the “sick” disk in the RAID disk group upon completion of a disk-to-disk copy operation. Once a target disk has been allocated, a disk-to-disk copy operation is initiated to copy data from the “sick” disk to the target disk, thereby preventing the need to reconstruct data on the “sick” disk if the “sick” disk actually fails. During the disk-to-disk copy operation, client-initiated disk access operations continue to be serviced. Upon completion of the disk-to-disk copy operation, the storage system reconfigures the RAID disk group by swapping the target disk with the “sick” disk.