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. 10, 2010
Filed:
Mar. 29, 2006
Roy Clark, Hopkinton, MA (US);
David W. Desroches, Methuen, MA (US);
Roy Clark, Hopkinton, MA (US);
David W. DesRoches, Methuen, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
A technique protects shared data in a local device having local memory. The technique involves observing a page table entry (PTE) on the local device. The PTE is stored in a page table used for managing virtual to physical address translations, tracking page modifications and handling page faults between semiconductor memory and magnetic disk drive memory on the local device. The technique further involves leaving a mirroring routine inactive on the local device when the PTE indicates that shared data corresponding to the PTE has not been modified on the local device. The mirroring routine is configured to copy the shared data from the local memory to a remote device. The technique further involves activating the mirroring routine to mirror the shared data from the local memory to the remote device when the PTE indicates that shared data corresponding to the PTE has been modified on the local device.