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:
Jan. 22, 2002
Filed:
Dec. 30, 1998
Matthew J. D'Errico, Southboro, MA (US);
Steven M. Blumenau, Holliston, MA (US);
Erez Ofer, Brookline, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
A method and apparatus for managing a log of information in a computer system including a host computer and a storage system that stores data accessed by the host computer. The computer system includes a plurality of logical volumes of data that are visible to the host and the storage system and that are perceived by the host computer as comprising a plurality of raw storage devices. The storage system includes at least one physical storage device and at least one mapping layer that maps the logical volumes to the physical storage device. In one aspect of the invention, the log includes information concerning at least one I/O operation. The information includes a first component relating to aspects of the I/O operation controlled by the host computer and a second component relating to aspects of the I/O operation controlled by the storage system. In one aspect, the host computer stores the log which includes information relating to aspects of the I/O operation controlled by the intelligent storage system. In another aspect, the storage system stores the log which includes information relating to aspects of the I/O operation controlled by the host.