Paul W Mcgrath

US Patent:

7155586, Dec 26, 2006

Filed:

Dec 30, 2003

Appl. No.:

10/748753

Inventors:

Michael Paul Wagner - Raleigh NC, US
David William Harvey - Newton MA, US
Alan Lee Taylor - Cary NC, US
Paul Thomas McGrath - Raleigh NC, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 12/00

US Classification:

711162, 707204

Abstract:

A method of creating point-in-time views of data on a disk involves initiating from a host at least one session of writing data to a disk. For each session, an entry is created and stored on an array on the disk. The sessions are assigned unique IDs to each, and provide indications where data for a particular session may be found on the disk.

US Patent:

7159085, Jan 2, 2007

Filed:

Apr 19, 2002

Appl. No.:

10/126711

Inventors:

Michael Paul Wagner - Raleigh NC, US
Paul Thomas McGrath - Raleigh NC, US
J. Brandon Myers - Durham NC, US
Bruce Allen Keesee - Durham NC, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 12/00

US Classification:

711162, 707204

Abstract:

A method allows point-in-time viewing of session data for multiple sessions being stored on a disk. Session bits are set for the session data in memory which points to the data at any particular point in time, and this can be done for multiple sessions. In order to make the session data persistent, separate session bits are stored in a portion of a disk reserved for such session bits. Thus, in the event of failure where session bits which are stored in volatile memory such as RAM, are lost, the duplicate copy set in the non-volatile memory can be used to recreate the session once the failure is corrected.

US Patent:

7165155, Jan 16, 2007

Filed:

Aug 29, 2003

Appl. No.:

10/652967

Inventors:

Dennis Duprey - Raleigh NC, US
Paul T. McGrath - Raleigh NC, US
David Haase - Fuquay Varina NC, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 12/00

US Classification:

711162

Abstract:

This invention is a system and method for assisting the performance of incremental copying of data in a data storage environment and includes a tracking mechanism. In one embodiment, the tracking mechanism is implemented in such a way that it is able to track changes while allowing access to production data by carrying out unique methodology. In other embodiments, implementations include a system, a computer program product, or an apparatus, wherein each embodiment is configured for carrying out the steps involved in the methodology.

US Patent:

7275141, Sep 25, 2007

Filed:

Dec 19, 2003

Appl. No.:

10/741829

Inventors:

Dennis Duprey - Raleigh NC, US
Paul T. McGrath - Raleigh NC, US
David Haase - Fuquay Varina NC, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 12/00

US Classification:

711162, 707202, 707204

Abstract:

This invention is a system and method copying with unmarked data along with a capability for incremental copying of data in a data storage environment.

US Patent:

7702670, Apr 20, 2010

Filed:

Aug 29, 2003

Appl. No.:

10/652371

Inventors:

Dennis Duprey - Raleigh NC, US
Paul T. McGrath - Raleigh NC, US
David Haase - Fuquay Varina NC, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 17/30
G06F 17/40

US Classification:

707646, 707647, 707648, 707649

Abstract:

This invention is a system and method for assisting the performance of incremental copying of data in a data storage environment and includes a tracking mechanism. In one embodiment, the tracking mechanism is implemented in such a way that it is able to track changes while allowing access to production data by carrying out unique methodology. In other embodiments, implementations include a system, a computer program product, or an apparatus, wherein each embodiment is configured for carrying out the steps involved in the methodology.

US Patent:

8407445, Mar 26, 2013

Filed:

Mar 31, 2010

Appl. No.:

12/751665

Inventors:

Saurabh Pathak - Cary NC, US
David Haase - Fuquay Varina NC, US
Miles de Forest - Bahama NC, US
Paul T. McGrath - Raleigh NC, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 12/02

US Classification:

711170, 711114

Abstract:

Systems, methods, and computer readable media for triggering and coordinating pool storage reclamation are disclosed. According to one example, the method includes receiving an issued hint triggered by the execution of a data storage optimization operation applied to a mapped logical unit (MLU), wherein the MLU is one of a plurality of MLUs residing in a storage array, and computing an unused portion amount of an allocated storage space in the MLU, wherein the allocated storage space comprises a plurality of slices. If the unused portion amount exceeds a predetermined threshold value, detecting at least one of the slices to be released from the allocated storage space. The method also includes transferring data contained in a detected slice to at least one of the remaining slices in the allocated storage space, and removing the detected slice from the allocated storage space in the MLU to a common storage pool in the storage array, wherein the removed slice is allocated to any one of the plurality of MLUs.

US Patent:

8479046, Jul 2, 2013

Filed:

Jun 28, 2010

Appl. No.:

12/824966

Inventors:

Charles Christopher Bailey - Cary NC, US
Miles Aram de Forest - Bahama NC, US
David Haase - Fuquay Varina NC, US
Saurabh M. Pathak - Jersey City NJ, US
Chetan Rameshchandra Vaidya - Morrisville NC, US
Paul T. McGrath - Raleigh NC, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 11/00

US Classification:

714 25, 714 48, 714 2

Abstract:

Systems, methods, and computer readable media for tracking storage pool reservations are disclosed. According to one aspect, the subject matter described herein includes a system for tracking storage pool reservations. The system includes a storage entity having data storage space for storing data, the data storage space being divided into a plurality of slices. The system also includes one or more portions of non-volatile memory, different from the data storage space, for storing slice reservation statistics and information about requests that affect slice reservation statistics, wherein storing information in the portion of non-volatile memory is an atomic operation. The system further includes a control module for receiving a request that affect slice reservation statistics, storing information about the request in the portion of non-volatile memory, performing the request, and updating the slice reservation statistics and clearing the information about the request in the portion of non-volatile memory.

US Patent:

56664869, Sep 9, 1997

Filed:

Jun 23, 1995

Appl. No.:

8/493550

Inventors:

Robert A. Alfieri - Apex NC
James T. Compton - Durham NC
Andrew R. Huber - Monroeville PA
Paul T. McGrath - Raleigh NC
Khaled S. Soufi - Durham NC
Brian J. Thorstad - Cary NC
Eric R. Vook - Chapel Hill NC

Assignee:

Data General Corporation - Westboro MA

International Classification:

G06F 1516

US Classification:

39520047

Abstract:

A shared-disk cluster system includes a cluster membership manager framework which coordinates the joining or leaving among all nodes in a cluster including taking the multiple layers of involved subsystems through transitions. Subsystems are notified of transitions in particular order depending upon the transition, and all nodes' subsystems receiving a notification must process that notification prior to another layer of subsystems being notified. One of the subsystems registered for notification is an event manager in user space. The event manager carries out transfers of client services, including user applications, resulting from nodes joining and leaving the cluster. This includes a registration and launch service which registers a node, or multiple nodes, in a cluster which claims, or is assigned, responsibility for the service and provides an optional launching function which initiates the client service upon successful registration.