Randolph B Haagens

US Patent:

8031617, Oct 4, 2011

Filed:

Jul 28, 2006

Appl. No.:

11/495931

Inventors:

Jeffrey C. Mogul - Menlo Park CA, US
Mallikarjun Chadalapaka - Roseville CA, US
Randolph B. Haagens - Roseville CA, US
Richard F. Wrenn - Colorado Springs CO, US
Richard J. Wagner - Vernonia OR, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G01R 31/08
G06F 11/00

US Classification:

370241, 370242

Abstract:

A system and method for detecting path failure in a network are described. The system and method include a network interface which receives packets over particular connections, and an agent able to monitor the network interface and start a no-traffic timer for each particular connection when a packet is received on the connection. The agent is further able, when the no-traffic timer expires, to check for outgoing data on the particular connection, and compare a count of previously sent test packets against a limit. If the count is below the limit the agent sends a new test packet on the particular connection, the test packet provides an indication of the state of a network path associated with the particular connection. If the count is above the limit the agent initiates failover procedures for the associated path.

US Patent:

7363541, Apr 22, 2008

Filed:

Feb 23, 2004

Appl. No.:

10/785500

Inventors:

Randolph B. Haagens - Roseville CA, US
Mallikarjun Chadalapaka - Roseville CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F 11/00
G06F 11/28

US Classification:

714 20, 714 6, 714 50

Abstract:

An efficient technique for performing remote asynchronous mirroring includes receiving a stream of command requests, performing the requested commands, relaying the requested commands to a target while embedding an explicitly-defined or implied task precedence graph in the relayed commands to enable increased concurrency in tasks performed by the target.

US Patent:

20120239722, Sep 20, 2012

Filed:

Mar 18, 2011

Appl. No.:

13/051964

Inventors:

William J. Bolosky - Issaquah WA, US
Randolph B. Haagens - Bellevue WA, US
Norbert P. Kusters - Redmond WA, US
Peng Li - Lynnwood WA, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

G06F 15/16

US Classification:

709201

Abstract:

Embodiments are directed to processing read-only operations without storing the operations persistently, determining a processing order for read-only requests, and to directing read-only requests to nodes best able to handle the requests. In an embodiment, a quorum leader receives various read-only requests. The quorum leader controls process ordering for replicas in the leader's quorum. The quorum leader determines an appropriate order for processing the read-only operations, without clock-based synchronization. The quorum leader sends the read-only request to an appropriate replica in the quorum and executes the read-only request at the appropriate replica without storing the operation persistently.

US Patent:

49088238, Mar 13, 1990

Filed:

Jan 29, 1988

Appl. No.:

7/150262

Inventors:

Randolph B. Haagens - Roseville CA
Thomas A. Keaveny - Rocklin CA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

H04Q 1104

US Classification:

370 851

Abstract:

There is disclosed a data communications link adapter providing flow of data control and status information between an input/output (I/O) Backplane and a fiber optic Frontplane. The adapter represents a melding of I/O channel extender technology and data communications technology: a dedicated processor handles link layer protocol, leaving to software only higher protocol layers; a flow-through architecture is provided by the adapter; a combination of windowing and handshaking are used; and a relatively short frame of sixteen bytes is employed. The adapter includes a backplane adapter portion which serves to interconnect host equipment, a processor portion dedicated to layer 3 (circuit operations), a protocol controller dedicated to layer 2 (physical layer) operations, a fiber optic interface portion dedicated to layer 1 (physical link) operations, and an arbiter portion which couples the processor to a data path connecting the backplane adapter and the protocol controller. The arbiter controls data accesses that use a portion of the data path connecting the backplane adapter to the protocol controller and a data path between the protocol controller and the processor. A variety of data integrity measures are implemented on all data paths.

US Patent:

20140181026, Jun 26, 2014

Filed:

Mar 3, 2014

Appl. No.:

14/195495

Inventors:

- Redmond WA, US
Randolph B. Haagens - Bellevue WA, US
Norbert P. Kusters - Redmond WA, US
Peng Li - Lynnwood WA, US

Assignee:

MICROSOFT CORPORATION - Redmond WA

International Classification:

G06F 17/30

US Classification:

707634

Abstract:

Embodiments are directed to processing read-only operations without storing the operations persistently, determining a processing order for read-only requests, and to directing read-only requests to nodes best able to handle the requests. In an embodiment, a quorum leader receives various read-only requests. The quorum leader controls process ordering for replicas in the leader's quorum. The quorum leader determines an appropriate order for processing the read-only operations, without clock-based synchronization. The quorum leader sends the read-only request to an appropriate replica in the quorum and executes the read-only request at the appropriate replica without storing the operation persistently.