Dharmesh R Shah

US Patent:

7962703, Jun 14, 2011

Filed:

Aug 8, 2007

Appl. No.:

11/835777

Inventors:

Dharmesh R. Shah - San Jose CA, US
Anurag Agarwal - Aundh, IN
Ankur Arora - Maharashtra, IN
Nitin Madan - Maharashtra, IN
Sureshbabu Basavayya - Pashan, IN
Ashish Puri - Maharashtra, IN
Srikanth S. Mahabalarao - Pune, IN
Gurbir Singh Dhaliwal - Maharashtra, IN

Assignee:

Symantec Corporation - Mountain View CA

International Classification:

G06F 12/00

US Classification:

711154

Abstract:

Techniques for improving dirty page logging are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method for memory logging comprising the steps of determining for one or more pages of memory if the pages of memory are likely to be modified in a subsequent epoch, performing a first operation on the pages of memory that are likely to be modified in a subsequent epoch, and performing a second operation on the pages of memory that are not likely to be modified in a subsequent epoch, wherein the first operation and the second operation are dissimilar.

US Patent:

8311964, Nov 13, 2012

Filed:

Nov 12, 2009

Appl. No.:

12/617426

Inventors:

Petros Efstathopoulos - Los Angeles CA, US
Fanglu Guo - Los Angeles CA, US
Dharmesh Shah - San Jose CA, US

Assignee:

Symantec Corporation - Mountain View CA

International Classification:

G06F 17/00
G06N 5/00

US Classification:

706 45, 707791, 707705, 711113

Abstract:

A system and method for efficiently reducing a number of duplicate blocks of stored data. A file server both removes duplicate data and prevents duplicate data from being stored in the shared storage. A sampling rate may be used to determine which fingerprints, or hash values, are stored in an index. The sampling rate may be modified in response to changes in characteristics of the system, such as a change in the shared storage size, a change in a utilization of the shared storage, a change in the size of the storage unit, and reaching a threshold corresponding to utilization of the index. Also, a small cache may be maintained for holding fingerprint and pointer pair values prefetched from the shared storage. Each prefetched pair may be associated with data corresponding to a previous hit in the index. The association may be related to spatial locality, temporal locality, or otherwise.

US Patent:

8327028, Dec 4, 2012

Filed:

Sep 22, 2008

Appl. No.:

12/235295

Inventors:

Dharmesh Shah - San Jose CA, US
Gopal Sharma - San Jose CA, US
Grizel Lopez - Sunnyvale CA, US
Abhay Kumar Singh - Sunnyvale CA, US
Taher Vohra - Sunnyvale CA, US
Srikant Sharma - Santa Clara CA, US

Assignee:

Symantec Corporation - Mountain View CA

International Classification:

G06F 15/16

US Classification:

709248, 707674, 713503

Abstract:

A method and apparatus for synchronizing time within a data protection system is described. In one embodiment, the method includes processing input/output activity information associated with at least one client computer, wherein the input/output activity information comprises at least one local client timestamp, determining at least one server timestamp for the at least one local client timestamp and modifying the input/output activity information with the at least one server timestamp.

US Patent:

8375188, Feb 12, 2013

Filed:

Aug 8, 2007

Appl. No.:

11/835757

Inventors:

Dharmesh R. Shah - San Jose CA, US
Anurag Agarwal - Aundh, IN
Sameer Lokray - Cupertino CA, US
Srikanth S Mahabalarao - Pune, IN
Thomas A. Bean - West Columbia SC, US

Assignee:

Symantec Corporation - Mountain View CA

International Classification:

G06F 12/16
G06F 11/30

US Classification:

711169, 711162, 714 13

Abstract:

Techniques for epoch pipelining are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method for epoch pipelining comprising the steps of beginning a first epoch, determining for one or more pages of memory if the pages of memory are likely to be modified in a subsequent epoch, performing a first operation on the pages of memory that are likely to be modified in a subsequent epoch, beginning a second epoch, subsequent to the first epoch, performing a second operation on the pages of memory that are not likely to be modified in a subsequent epoch, and ending the first epoch, wherein the first operation and the second operation are dissimilar.

US Patent:

8572045, Oct 29, 2013

Filed:

Sep 25, 2008

Appl. No.:

12/237719

Inventors:

Dharmesh R. Shah - San Jose CA, US

Assignee:

Symantec Corporation - Mountain View CA

International Classification:

G06F 7/00
G06F 17/00

US Classification:

707679, 707674, 707685

Abstract:

Various embodiments of a system and method for restoring a plurality of files previously deleted from a volume are described. For each respective file of the plurality of deleted files, the method may operate to determine a time at which the respective file was last modified and a time at which the respective file was deleted. These times define a respective recovery time window for the respective file. The method may further comprise determining a particular point in time that is within the recovery time windows for two or more of the plurality of deleted files. A temporary version of the volume as it existed at the particular point in time may be created, and each file of the two or more files may be restored to the volume from the temporary version of the volume.

US Patent:

20050033988, Feb 10, 2005

Filed:

Oct 17, 2003

Appl. No.:

10/688204

Inventors:

Ganesan Chandrashekhar - San Jose CA, US
Sanjay Sawhney - Cupertino CA, US
Hemant Puri - Santa Clara CA, US
Aseem Vaid - San Jose CA, US
Dharmesh Shah - San Jose CA, US

Assignee:

NeoScale Systems, Inc. - Milpitas CA

International Classification:

H04L009/00

US Classification:

713201000

Abstract:

A method processing one or more files using a security application. The method includes a method processing one or more files using a security application. The method includes connecting the client to a proxy server, which is coupled to one or more NAS servers. The method includes requesting for a file from a client to the proxy server and authenticating a requesting user of the client. The method also includes authorizing the requesting user for the file requested; requesting for the file from the one or more NAS servers after authenticating and authorizing; and requesting for the file from the one or more storage elements. The file is transferred from the one or more storage elements through the NAS server to the proxy server. The method determines header information on the file at the proxy server and identifies a policy based upon the header information at the proxy server. The method also includes processing (e.g., decompressing the file, decrypting the file, and verifying the file) the file according to the policy. The method includes transferring the processed file to the user of the client.

US Patent:

20050041812, Feb 24, 2005

Filed:

Oct 17, 2003

Appl. No.:

10/688848

Inventors:

Kumar Sundararajan - Fremont CA, US
Dharmesh Shah - San Jose CA, US
Sanjay Sawhney - Cupertino CA, US
Atul Pandit - Sunnyvale CA, US
Aseem Vaid - San Jose CA, US
Richard Moeller - San Jose CA, US

Assignee:

NeoScale Systems, Inc. - Milpitas CA

International Classification:

H04K001/00

US Classification:

380256000

Abstract:

A system (and methods) for performing a service operation on a Fibre Channel or other like channels. The system has an interface coupled to a Fibre Channel. A classifier is coupled to the interface. The classifier is adapted to receive an initiator frame from the interface. The classifier is adapted to determine header information from the initiator frame and is also adapted to determine source information, destination information, and exchange information from the header information. A flow content addressable memory is coupled to the classifier. The flow content addressable memory is configured to store one or more header information. Each of the one or more header information is associated with a state. The system has a rule content addressable memory coupled to the classifier. The rule content addressable memory is configured to store one of a plurality of policies. A processing module is coupled to the classifier. The processing module is adapted to process an incoming payload associated with the initiator frame and the header information.

US Patent:

20080201602, Aug 21, 2008

Filed:

Feb 16, 2007

Appl. No.:

11/707441

Inventors:

Anurag Agarwal - Pune, IN
Dharmesh Shah - San Jose CA, US
Nagaraj Kalmala - Sunnyvale CA, US
Neelakandan Panchaksharam - Pune, IN
Rajeev Bharadhwaj - Saratoga CA, US
Sameer Lokray - Cupertino CA, US
Srikanth Sm - Pune, IN
Thomas Bean - West Columbia SC, US

Assignee:

Symantec Corporation - Mountain View CA

International Classification:

G06F 11/20
G06F 17/30

US Classification:

714 4, 707202, 714E1108, 707E17009

Abstract:

Method and apparatus for transactional fault tolerance in a client-server system is described. In one example, output data generated by execution of a service on a primary server during a current epoch between a first checkpoint and a second checkpoint is buffered. A copy of an execution context of the primary server is established on a secondary server in response to the second checkpoint. The output data as buffered is released from the primary server in response to establishment of the copy of the execution context on the secondary server.