Michael David Wagner
Architects at Glascock St, Raleigh, NC

6829609, Dec 7, 2004

Jan 11, 2000

09/480390

Michael P. Wagner - Raleigh NC

EMC Corporation - Hopkinton MA

G08F 1730

707 8, 707 10

A system, device, and method for providing mutual exclusion for computer system resources utilizes a lock mechanism in which a process that does not own a particular resource creates a lock for the resource upon receiving an inquiry from another process. The lock may be a full instantiation of a lock or a partial instantiation of a lock. In either case, the lock indicates, among other things, the owner process for the resource. When the non-owner process requires access to the resource, the non-owner process uses the lock to determine the owner process and sends a request to the owner process requesting access to the resource.

7536507, May 19, 2009

Mar 30, 2006

11/393467

Michael P. Wagner - Raleigh NC, US
Dave Harvey - Newton MA, US
Sriram Nagasubramanian - Morrisville NC, US

EMC Corporation - Hopkinton MA

G06F 12/00

711114, 711154, 711162, 711165

Methods, systems, and computer program products for preserving atomic writes to disk arrays are disclosed. According to one method, portions of a file are stored in paired locations on a disk array such that a first location of a location pair for a file portion stores scratch data for the file portion and a second portion of the location pair for the file portion stores valid data for the file portion. A bitmap is stored on the disk array. The bitmap has bits indicating whether valid data for each file portion resides in the first or the second location for its respective location pair. A write request to write data to a portion of the file being less than the entire file is received. The bitmap indicates that valid data for the portion of the file to be written to resides in a first memory location of one of the location pairs on the disk array. In response to the write request, the bitmap is copied to memory, the data for the portion of the file requested to be modified is copied from the first location of the one location pair to a second location of the one location pair on the disk array without copying the entire file and modifying the data in the second location based on the data to be written. The bitmap stored in memory is modified to indicate that valid data for the portion of the file resides in the second location of the one location pair and that scratch data for the portion of the file resides in the first location on the disk array.

7328318, Feb 5, 2008

Mar 31, 2005

11/095885

Michael L. Burriss - Raleigh NC, US
Michael P. Wagner - Raleigh NC, US
Alan L. Taylor - Cary NC, US
William P. Hotle - Apex NC, US

EMC Corporation - Hopkinton MA

G06F 12/00

711161, 711162

A method system and program product for atomic operations across multi-volume or multi-LUNs in a data storage environment. It is difficult to manage data storage and replication operations occurring across such multi-LUNs. The method system and program product embodiments overcome these deficiencies and facilitate data storage management and replication operations through library initializations in response to host I/O requests. Accordingly, the invention ensures the integrity of the data being managed without introducing significant cost or overhead.

7334096, Feb 19, 2008

Mar 31, 2005

11/095886

Michael L. Burriss - Raleigh NC, US
Michael P. Wagner - Raleigh NC, US
Alan L. Taylor - Cary NC, US
William P. Hotle - Apex NC, US

EMC Corporation - Hopkinton MA

G06F 12/00

711161, 711162

An architecture and apparatus for atomic operations across multi-volume or multi-LUNs in a data storage environment. It is difficult to manage data storage and replication operations occurring across such multi-LUNs. The architecture and apparatus embodiments of the invention overcome these deficiencies and facilitate data storage management and replication operations through library initializations in response to host I/O requests to complete atomic operations. Accordingly, the invention ensures the integrity of the data being managed without introducing significant cost or overhead.

7155586, Dec 26, 2006

Dec 30, 2003

10/748753

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

EMC Corporation - Hopkinton MA

G06F 12/00

711162, 707204

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.

7159085, Jan 2, 2007

Apr 19, 2002

10/126711

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

EMC Corporation - Hopkinton MA

G06F 12/00

711162, 707204

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.

8452816, May 28, 2013

Mar 31, 2010

12/750919

Saurbh M Pathak - Cary NC, US
Miles A. DeForest - Bahama NC, US
David Haase - Fuquary Varina NC, US
Jackson Brandon Myers - Cary NC, US
Sriram Nagasubramanian - Morrisville NC, US
Michael P. Wagner - Raleigh NC, US

EMC Corporation - Hopkinton MA

G06F 17/30

707802

A method is used in managing database access. A framework is provided for translating versioned data between memory and persistent storage. Based on the framework, read and write requests that access records in a database are translated. Based on the framework, it is made to appear that the database is a different version of the database.