Denis E Hall

US Patent:

6662197, Dec 9, 2003

Filed:

Jun 25, 1999

Appl. No.:

09/344999

Inventors:

Douglas E. LeCrone - Hopkinton MA
Daniel A. Murphy - Hopkinton MA
Denis Hall - Chelmsford MA

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 1730

US Classification:

707204, 711162

Abstract:

A method and apparatus for monitoring update activity, particularly in the form of write requests, to a data storage facility, over at least one cycle to identify any write operation or update that occurs to that data storage facility on a track-by-track basis. At the end of each cycle a list of changed tracks is stored in a data set. After information has been accumulated by a collector application, a reporter application manipulates the data to obtain information concerning the track changes and to estimate communication path requirements.

US Patent:

6954835, Oct 11, 2005

Filed:

Oct 30, 2002

Appl. No.:

10/283976

Inventors:

Douglas E. Lecrone - Hopkinton MA, US
Paul A. Linstead - Shrewsbury MA, US
Daniel A. Murphy - Hopkinton MA, US
Denis E. Hall - Chelmsford MA, US
Raymond Wong - Brookline MA, US
Eugene D. Pflueger - Medfield MA, US
Kevin C. Heasley - Franklin MA, US
Michael E. Specht - Acton MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F012/00

US Classification:

711162, 711161, 707204

Abstract:

A data-mirroring method in which, while an I/O process is processing a first I/O request for writing data to a first device, control is obtained from that I/O process executing on a host computer. A second I/O request, this one for writing the data to the second device, is then created. Then, control is returned to the I/O process by causing the first I/O request to be made available to a first data storage system managing the first device.

US Patent:

7516168, Apr 7, 2009

Filed:

Oct 23, 2003

Appl. No.:

10/692285

Inventors:

Douglas E. LeCrone - Hopkinton MA, US
Daniel A. Murphy - Hopkinton MA, US
Denis Hall - Chelmsford MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 17/30

US Classification:

707204, 707201, 707202, 707203, 711130, 711161, 711162

Abstract:

A method and apparatus for monitoring update activity, particularly in the form of write requests, to a data storage facility, over at least one cycle to identify any write operation or update that occurs to that data storage facility on a track-by-track basis. At the end of each cycle a list of changed tracks is stored in a data set. After information has been accumulated by a collector application, a reporter application manipulates the data to obtain information concerning the track changes and to estimate communication path requirements.