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. 09, 2005
Filed:
Mar. 26, 2002
Clark Lubbers, Colorado Springs, CO (US);
Susan Elkington, Colorado Springs, CO (US);
Randy Hess, Colorado Springs, CO (US);
Stephen J. Sicola, Palmer Lake, CO (US);
James Mccarty, Colorado Springs, CO (US);
Anuja Korgaonkar, Colorado Springs, CO (US);
Jason Leveille, Colorado Springs, CO (US);
Clark Lubbers, Colorado Springs, CO (US);
Susan Elkington, Colorado Springs, CO (US);
Randy Hess, Colorado Springs, CO (US);
Stephen J. Sicola, Palmer Lake, CO (US);
James McCarty, Colorado Springs, CO (US);
Anuja Korgaonkar, Colorado Springs, CO (US);
Jason Leveille, Colorado Springs, CO (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A data storage system adapted to maintain redundant data storage sets at a destination location(s) is disclosed. The data storage system establishes a copy set comprising a source volume and a destination volume. Data written to a source volume is automatically copied to the destination volume. The data storage system maintains a data log that may be activated when the destination volume is inaccessible due to, for example, a malfunction in the destination storage system or in the communication link between the source system and the destination system. I/O commands and the data associated with those commands are written to the data log, and after a destination system becomes available the information in the data log is merged into the destination volume to conform the data in the destination volume to the data in the source volume. The data log competes for disk capacity with other volumes on the system, and log memory is allocated as needed. Command entries and data entries are stored in distinct areas of the data log, and the command entries include information identifying the memory offset of the associated data entries.