Michael P Manning

US Patent:

7454561, Nov 18, 2008

Filed:

Jun 16, 2005

Appl. No.:

11/153932

Inventors:

Phillip Fultz - Clinton MA, US
Ashok Tamilarasan - Framingham MA, US
Michael Manning - Hopkinton MA, US
Thomas Dibb - Rutland MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 13/00

US Classification:

711112, 711163, 711166

Abstract:

A system sets a disk access inhibitor flag whenever a disk drive is placed by the system in an inaccessible condition. The drive operates to set a bit therein when the drive has placed itself in a by-pass condition. During each polling event, the system determines: (1) whether the bit has been set; and (2) whether the disk access inhibitor flag has been set. If the bit has been set and such disk access inhibitor flag has been set, the system maintains the drive in the inaccessible condition; otherwise, the drive is accessible to the system. If, during a polling event, the bit has been set but that drive has not had a bit set during a relatively long period of time, the system maintains the drive accessible to the system unless the drive sets the bit during a subsequent predetermined wait period, after which the system sets the flagdisk access inhibitor flag and places the drive in the inaccessible condition.

US Patent:

7486083, Feb 3, 2009

Filed:

Dec 18, 2006

Appl. No.:

11/640669

Inventors:

Michael Manning - Hopkinton MA, US
Ashok Tamilarasan - Framingham MA, US

Assignee:

EMC Corporation - Hopkinon MA

International Classification:

G01R 31/02
G06F 13/00

US Classification:

324537, 711114

Abstract:

System stability is managed. It is determined that a data storage system is responsive to an enclosure that is unstable. Based on the determination, the enclosure is temporarily prevented from being added to the data storage system.

US Patent:

7624300, Nov 24, 2009

Filed:

Dec 18, 2006

Appl. No.:

11/640668

Inventors:

Michael Manning - Hopkinton MA, US
Ashok Tamilarasan - Framingham MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 11/00

US Classification:

714 7

Abstract:

Storage stability is managed. It is detected that a disk drive is requesting to be taken offline. The disk drive is begun to be treated as being in a probation state. If within an acceptable period of time the disk drive requests to be put back online, treatment of the disk drive as being in a probation state is stopped, and only any portions of the disk drive data that were the subject of write requests involving the disk drive while the disk drive was being treated as being in a probation state are rebuilt.

US Patent:

7779306, Aug 17, 2010

Filed:

Mar 23, 2007

Appl. No.:

11/690147

Inventors:

Brion Philbin - South Grafton MA, US
Michael Manning - Hopkinton MA, US
Ashok Tamilarasan - Framingham MA, US
Ying Guo - Northborough MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 11/00

US Classification:

714 43, 714 4, 370216

Abstract:

A method for automatically diagnosing faults a data storage system. The system includes a plurality of enclosures each having: a primary port; an expansion port; a plurality of disk drives; and a link control card coupled to the primary port and to the expansion port and the plurality of disk drives. The link control card includes a cut through switch having: disk drive port error counters for counting at ports of the plurality of disk drives; a primary port error counter for counting cumulative errors at the primary port, and an expansion port error counter for counting cumulative errors at the expansion port. The primary ports and expansion ports are serially interconnected to the storage processor through a fiber channel loop. The method sequentially reads counters in each one of the enclosures to determine whether errors counted in any one of such counters exceeds a predetermined threshold over a predetermined period of time.

US Patent:

7861123, Dec 28, 2010

Filed:

Dec 20, 2007

Appl. No.:

12/004311

Inventors:

Ashok Tamilarasan - Framingham MA, US
Michael Manning - Hopkinton MA, US
Naizhong Qiu - Wayland MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 11/00

US Classification:

714 43

Abstract:

Loop interface failure is managed. A first device on a loop is identified as a potential cause of the loop interface failure. The loop is tested with the first device functionally removed from the loop. Depending on the results of the test, it is determined that the first device is not the cause of the loop interface failure and a second device on the loop is identified as the cause of the loop interface failure.

US Patent:

8161316, Apr 17, 2012

Filed:

Sep 30, 2008

Appl. No.:

12/241708

Inventors:

Michael Manning - Hopkinton MA, US
Ashok Tamilarasan - Framingham MA, US
Naizhong Chiu - Wayland MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 11/00

US Classification:

714 51, 714 2, 714 61, 714 25, 714 42

Abstract:

A method is used in managing loop interface instability. It is determined that a loop has excessive intermittent failures. It is determined, based on whether the intermittent failures are detectable on another loop, whether the cause of the excessive intermittent failures is within a specific category of components. A search procedure is executed that is directed to the specific category of components, to isolate the cause of the excessive intermittent failures.

US Patent:

8407527, Mar 26, 2013

Filed:

Jun 30, 2009

Appl. No.:

12/494467

Inventors:

Brion Philbin - North Grafton MA, US
Michael Manning - Hopkinton MA, US
Ashok Tamilarasan - Framingham MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 11/00

US Classification:

714 43

Abstract:

Hardware faults in data storage systems are diagnosed. User I/O errors are received. Disk drive port error counters, primary port error counters, and expansion port error counters are read. A user I/O error threshold is modified based on the error counter readings. Depending on the type of errors counted, the user I/O error threshold may be increased or decreased. Once a first quantity of user I/O errors exceeds the modified user I/O error threshold, a faulty component is identified.

US Patent:

54338328, Jul 18, 1995

Filed:

Feb 7, 1994

Appl. No.:

8/192917

Inventors:

Stanley R. Rich - late of Grantham NH
Alvaro Kaplan - Framingham MA
Michael P. Manning - Nahant MA

Assignee:

ENOX Technologies, Inc. - Natick MA

International Classification:

B01J 1908
H05F 304

US Classification:

204164

Abstract:

A moving fluid containing pollutants including NOx compounds is subjected to a relatively low-power alternating-current dielectric discharge for a relatively long time duration. In this manner, pollutants are oxidized and dissociated while the temperature of the fluid is kept low enough to prevent the formation of new NOx pollutants.