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:
May. 20, 2008
Filed:
Aug. 11, 2006
Hana Moreshet, Framingham, MA (US);
Haim Kopylovitz, Newton, MA (US);
Adi Ofer, Wellesley, MA (US);
David Meiri, Cambridge, MA (US);
Mark J. Halstead, Watertown, MA (US);
Hana Moreshet, Framingham, MA (US);
Haim Kopylovitz, Newton, MA (US);
Adi Ofer, Wellesley, MA (US);
David Meiri, Cambridge, MA (US);
Mark J. Halstead, Watertown, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
Accessing stored data includes providing a virtual storage area having a table of pointers that point to one of: a disk storage area and a volatile memory area, wherein the virtual storage area contains no sections of data, in response to a request for accessing data of the virtual storage area, determining whether a corresponding one of the pointers points to the disk storage area or points to the volatile storage area and accessing the data from the disk storage area or from the volatile storage area. Accessing stored data may also include associating a first one of the other storage areas with the virtual storage area, wherein the virtual storage area represents a copy of data of the disk storage area. Accessing stored data may also include causing all of the pointers of the table to initially point to sections of the disk storage area when the virtual storage area is initially associated with the disk storage area. Accessing stored data may also include, in response to a write to a first section on the disk storage area, copying data of the first section to a second section that is part of the volatile storage area and causing a corresponding one of the pointers of the table to point to the second section.