Peter T Mccann

US Patent:

6658522, Dec 2, 2003

Filed:

Jun 16, 2000

Appl. No.:

09/596295

Inventors:

Brian James Martin - Worcester MA
Peter John McCann - Mason NH

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 1200

US Classification:

711 1, 711 6, 711163, 711203, 711206, 709 1, 709103, 710 6

Abstract:

Featured is a method for reducing overhead associated with system input output (I/O) operations in a computer system having a plurality of processors and a physical memory accessed and used by the plurality of processors. The physical memory being accessed can be a global physical memory such as that used with SMP types of architectures or distributed physical memory such as that used with CCNUMA types of architectures. Such a method includes creating a pinned virtual memory range database in which is stored virtual memory address information corresponding to pinned physical memory for each applications program being run on the computer system. Also featured is an operating system for execution with a multiprocessor computer system and a multiprocessor computer including such an operating system for execution therein.

US Patent:

7020669, Mar 28, 2006

Filed:

Sep 27, 2001

Appl. No.:

09/965393

Inventors:

Peter John McCann - Mason NH, US
Brian James Martin - Redmond WA, US
Roy Clark - Hopkinton MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 12/00
G06F 17/30

US Classification:

707206, 707204, 707202, 707203

Abstract:

Featured are methods for writing file systems write data operations to storage medium as well as system and program embodying such a methodology. According to one aspect, the method includes storing a file systems write data operation to a first temporary data store and mirroring the file systems write data operation in a second temporary data store. The method further includes deleting the mirrored file systems write data operation from the second temporary data store if it is successfully written from the first temporary data store to the storage medium and writing the mirrored file systems write data operation from the second temporary data store to the storage medium if it is not successfully written from the first temporary data store. In another aspect, the method includes storing the file systems write data operation in the first temporary data store of one server and mirroring it in the second temporary data store of another server. The method further includes monitoring the operational status of each server and writing the mirrored file systems write data operation from the second temporary data store of the other server to the storage medium when it is determined that one of the servers is not operational.

US Patent:

7062675, Jun 13, 2006

Filed:

Jun 25, 2002

Appl. No.:

10/179113

Inventors:

John N. Kemeny - Westford MA, US
Jun Ohama - Mendon MA, US
Douglas Sullivan - Milford MA, US
Peter J. McCann - Mason NH, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 11/00

US Classification:

714 15, 711135, 711138

Abstract:

In a storage system including a write-back cache, dirty data can be flushed from the cache while a controller continues to service host I/O requests. A controller is capable of flushing all the dirty data in the cache to a storage device in response to an indication to do so, such as an indication of impending failure. The controller is further capable of responding to I/O requests from the host during the flushing of the dirty data. In particular, the controller is capable of responding to write requests from the host system by storing data on the storage device during the flushing of the dirty data.

US Patent:

7124171, Oct 17, 2006

Filed:

May 23, 2002

Appl. No.:

10/153583

Inventors:

Peter J. McCann - Mason NH, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 15/167
G06F 17/30

US Classification:

709216, 707200

Abstract:

A highly available shared file system is described for use in computing environments. A floating network address can be associated with any one of a plurality of servers. The floating network address is associated with a first server. An area of data on a storage device is made available by the first server to be accessed by the other servers. The other servers then refer to the floating network address to access the area of data through the first server. If the first server becomes unavailable, the floating network address is transferred from the first server to a second server. The area of data is then made available by the second server to be accessed by the other servers. The other servers continue to access the area of data through the second server by referring to the floating network address.

US Patent:

7950022, May 24, 2011

Filed:

Jun 29, 2007

Appl. No.:

11/824506

Inventors:

Christopher M. Gould - Leominster MA, US
Peter J. McCann - Mason NH, US
Jeffrey A. Brown - Shrewsbury MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 9/44

US Classification:

719327, 719328

Abstract:

Described are techniques for facilitating communication between device drivers. A device driver is provided that makes at least one call using an application programming interface. The application programming interface facilitates communication between the device driver module and a target code module. The application programming interface provides support for performing the at least one call from a first execution mode associated with the device driver module and a second execution mode associated with the target code module. The application programming interface provides support for user space to user space communication, user space to kernel space communication, kernel space to kernel space communication, and kernel to user space communication. The first execution mode of the device driver module and said second execution mode of the target code module are determined. A communication path between the modules is established in accordance with said first execution mode and said second execution mode.

US Patent:

7950025, May 24, 2011

Filed:

Jun 29, 2007

Appl. No.:

11/824542

Inventors:

Peter J. McCann - Mason NH, US
Christopher M. Gould - Leominster MA, US
Jeffrey A. Brown - Shrewsbury MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 9/44

US Classification:

719328, 719310

Abstract:

Described are techniques for facilitating communication between code modules. A first code module is provided that makes at least one call using an application programming interface. The application programming interface facilitates communication between the first code module and a target code module and provides support for performing the at least one call from a first execution mode associated with the first code module and a second execution mode associated with the target code module. The application programming interface provides support for user space to user space communication, user space to kernel space communication, kernel space to kernel space communication, and kernel to user space communication. The first execution mode of the first code module and said second execution mode of the target code module are determined. A communication path is established between the code modules in accordance with the first and second execution modes.

US Patent:

8205218, Jun 19, 2012

Filed:

Jun 29, 2007

Appl. No.:

11/824433

Inventors:

Peter J. McCann - Mason NH, US
Christopher M. Gould - Leominster MA, US
Jeffrey A. Brown - Shrewsbury MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 13/00
G06F 17/30

US Classification:

719328, 707705, 707821, 711111, 719321

Abstract:

Described are techniques for facilitating communication between code modules. A first code module is provided that makes at least one call using an application programming interface. The application programming interface facilitates communication between the first code module and a target code module and provides support for performing the at least one call from a first execution mode associated with the first code module and a second execution mode associated with the target code module. The application programming interface provides support for user space to user space communication, user space to kernel space communication, kernel space to kernel space communication, and kernel to user space communication. The first execution mode of the first code module and said second execution mode of the target code module are determined. A communication path is established between the code modules in accordance with the first and second execution modes.

US Patent:

8271996, Sep 18, 2012

Filed:

Sep 29, 2008

Appl. No.:

12/286493

Inventors:

Christopher M. Gould - Leominster MA, US
Peter J. McCann - Mason NH, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 9/54

US Classification:

719312, 719313, 719314, 719315, 719316, 719317, 719318, 719330

Abstract:

Described are techniques for communicating between one or more producers and one or more consumers. A first consumer of an event queue registers for notification regarding occurrences of one or more events. A producer of the event queue posts one or more notifications to one or more consumers of the event queue regarding one or more occurrences of one or more events. Each of the consumers receive notification regarding occurrences of events for which the consumer is registered. The first consumer retrieves posted event notifications regarding events for which the first consumer is registered. If the first consumer is executing in user space and an event notification list to which the event notifications for the first consumer are posted is located in shared memory, the first consumer retrieves the posted event notifications without proxying into kernel space.