Dennis A Ting

US Patent:

7676587, Mar 9, 2010

Filed:

Dec 14, 2004

Appl. No.:

11/011345

Inventors:

Sorin Faibish - Newton MA, US
Xiaoye Jiang - Shrewsbury MA, US
Dennis Ting - Groton MA, US
Yehoshoua Sasson - Newton MA, US
Arthur O. Harris - Framingham MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 15/13

US Classification:

709230, 709219, 709226, 709227, 709231, 711150, 711151

Abstract:

Network servers in a cluster share the same network protocol address for incoming client requests, and in a data link layer protocol a reply of a client to a request from a server is returned to this same server. For example: (1) ports of the servers are clustered into one single network channel used for incoming and outgoing requests to and from the servers; or (2) ports of the servers are clustered into one single network channel used for incoming requests to the servers and a separate port of each of the servers is used for outgoing requests from each of the servers; or (3) logical ports of the servers are clustered into one network channel used for requests to the servers and a separate logical port of each of the servers is used for outgoing requests from each of the servers.

US Patent:

8510409, Aug 13, 2013

Filed:

Dec 23, 2009

Appl. No.:

12/646294

Inventors:

Arthur Harris - Framingham MA, US
Dennis Ting - Groton MA, US
Himabindu Tummala - South Grafton MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 15/16
G06F 15/173

US Classification:

709217, 709238, 709228

Abstract:

An application program of a multi-homed host computer at a multi-homed Internet site specifies a destination IP address, a local network interface device and a local site gateway to the network layer of the host computer when establishing a remote TCP connection to the destination IP address, and then the network layer of the operating system of the host computer uses only this specified outbound source path for the remote TCP connection instead of an outbound source path from an operating system supplied routing table. This allows the host application to have control over its remote output paths and provides the host application with the ability to create private remote connections.

US Patent:

59480629, Sep 7, 1999

Filed:

Nov 13, 1996

Appl. No.:

8/747875

Inventors:

Percy Tzelnic - Concord MA
Uresh K Vahalia - Newton MA
Dennis P.J. Ting - Groton MA
Uday Gupta - Westford MA

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

H04N 714
H04N 7173

US Classification:

709219

Abstract:

For network file access, a plurality of data mover computers are linked to a cached disk array. Read-write files stored in the cached disk array are accessible to network clients through more than one of the data mover computers so that the data mover computers are not a bottleneck to file access. The cached disk array stores a network file directory including file locking information, and the data mover computers each have file system software that accesses the network file directory for shared read-write file access. The data mover computers perform the file system tasks such as managing the file directory for mapping of file names to logical blocks and for locking and unlocking of the files in order to minimize loading on the cached disk array. Therefore, the network file server need not use any particular one of the data mover computers to serve as a control point for read-write file access. Instead, file system software for managing the file directory is replicated in each data mover computer.

US Patent:

60852151, Jul 4, 2000

Filed:

Nov 17, 1997

Appl. No.:

8/971788

Inventors:

Kadangode K. Ramakrishnan - Maynard MA
Dennis Ting - Groton MA
Lev Vaitzblit - Concord MA

Assignee:

Cabletron Systems, Inc. - Rochester NH

International Classification:

G06F 946

US Classification:

709102

Abstract:

Method and apparatus for avoiding receive livelock and transmit starvation, and for minimizing packet loss and latency in a communication network station. The invention uses a combination of processing threads, polling and, in a preferred embodiment, a judicious use of interrupts, to allocate the use of processing resources fairly among competing functions. Real time processing threads are structured to execute for a preselected maximum time interval, based on numbers of units processed by each thread, and then to yield control to a thread scheduler, which selects and invokes a new thread for execution. Work to be done in the various threads is determined either by polling or by an interrupt system, and then posted to the threads for execution. If interrupts are used, interrupt service routines perform only the minimal processing needed to recognize an interrupt, other interrupt servicing functions being deferred for execution in a processing thread. The thread scheduler operates on a round-robin basis and also selects from at least one general purpose processing thread for functions that are less time critical, the general purpose thread being structured to operate for a selected minimum time, if needed, in a non-preemptable mode, and thereafter in a preemptable mode.