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:
Jul. 05, 2005
Filed:
Oct. 22, 2001
Clark E. Lubbers, Colorado Springs, CO (US);
James M. Reiser, Colorado Springs, CO (US);
Anuja Korgaonkar, Colorado Springs, CO (US);
Randy L. Roberson, New Port Richey, FL (US);
Robert G. Bean, Monument, CO (US);
Clark E. Lubbers, Colorado Springs, CO (US);
James M. Reiser, Colorado Springs, CO (US);
Anuja Korgaonkar, Colorado Springs, CO (US);
Randy L. Roberson, New Port Richey, FL (US);
Robert G. Bean, Monument, CO (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A storage system permits virtual storage of user data by implementing a logical disk mapping structure that provides access to user data stored on physical storage media and methods for generating point-in-time copies, or snapshots, of logical disks. A snapshot logical disk is referred to as a predecessor logical disk and the original logical disk is referred to as a successor logical disk. Creating a snapshot involves creating predecessor logical disk mapping data structures and populating the data structures with metadata that maps the predecessor logical disk to the user data stored on physical media. Logical disks include metadata that indicates whether user information is shared between logical disks. Multiple generations of snapshots may be created, and user data may be shared between these generations. Methods are disclosed for maintaining data accuracy when write I/O operations are directed to a logical disk.