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. 31, 2018
Filed:
Dec. 22, 2016
Emc Ip Holding Company Llc, Hopkinton, MA (US);
Milind M. Koli, Morrisville, NC (US);
Timothy C. Ng, Cary, NC (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
Techniques are provided for implementing a zero detection feature in the middle of a I/O driver stack that is able to function properly on migration of a thickly-provisioned logical disk to a thinly-provisioned logical disk. This may be accomplished by creating the destination thinly-provisioned logical disk with a Zero Detect mode that is initially set to active upon a migration. The zero detection feature implemented in the middle of the I/O driver stack is configured to require any writes to a logical disk to be buffered when that logical disk is in active Zero Detect mode, and to automatically apply zero detection to such writes to prevent writing entire blocks of zeroes. The Zero Detect mode may then be set to passive upon completion of the migration, allowing zero detection to be applied only to select write operations in the normal course of operation.