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:
Sep. 08, 2009
Filed:
Apr. 29, 2005
Loellyn Cassell, Pleasanton, CA (US);
Atul Goel, Santa Clara, CA (US);
James Leong, Hillsborough, CA (US);
Rajesh Sundaram, Mountain View, CA (US);
Loellyn Cassell, Pleasanton, CA (US);
Atul Goel, Santa Clara, CA (US);
James Leong, Hillsborough, CA (US);
Rajesh Sundaram, Mountain View, CA (US);
Network Appliance, Inc., Sunnyvale, CA (US);
Abstract
A method and system for rapidly recovering data from a failed disk in a RAID disk group are disclosed. According to one aspect of the present invention, a RAID-based storage system identifies a particular disk in a RAID disk group as a 'dead' disk (e.g., incapable of servicing client-initiated requests in a timely manner). Accordingly, a spare disk is allocated to replace the 'dead' disk and client-initiated read/write requests are directed to the spare disk for servicing. In addition, a disk-to-disk copy operation is initiated. Without overwriting valid data on the target disk with stale data from the “dead” disk, the disk-to-disk copy operation copies data from the “dead” disk to the target by directly reading data from the “dead” disk while reconstructing only the data that cannot be read directly from the “dead” disk.