Anand M K Iyengar

US Patent:

7346664, Mar 18, 2008

Filed:

Apr 23, 2004

Appl. No.:

10/831376

Inventors:

Thomas K. Wong - Pleasanton CA, US
Panagiotis Tsirigotis - Sunnyvale CA, US
Anand Iyengar - Mountain View CA, US
Rajeev Chawla - Union City CA, US

Assignee:

Neopath Networks, Inc. - San Jose CA

International Classification:

G06F 13/00

US Classification:

709214, 709215, 709226, 707200

Abstract:

A NAS switch provides file migrations in a NAS storage network that are transparent to the clients. A source file server exports an original NAS file handles indicative of object locations on the source file server to the NAS switch. The NAS switch modifies the original NAS file handles to an internal file system and maps the original NAS file handles to a switch file handles independent of location. The NAS switch exports the switch file handles to a client. The client looks-up objects and makes NAS requests to the source file server using switch file handles. The NAS switch performs file migration by first replicating the namespace containing data to be migrated from source file server to a destination file server. Separately, the NAS replicates data which is a relatively longer process than the namespace replication. During data replication, namespace access requests for objects are directed to the replicated namespace.

US Patent:

7587422, Sep 8, 2009

Filed:

Apr 23, 2004

Appl. No.:

10/831701

Inventors:

Thomas K. Wong - Pleasanton CA, US
Panagiotis Tsirigotis - Sunnyvale CA, US
Anand Iyengar - Mountain View CA, US
Rajeev Chawla - Union City CA, US

Assignee:

Neopath Networks, Inc. - Santa Clara CA

International Classification:

G06F 17/30

US Classification:

7071041, 707204, 709217, 709223

Abstract:

A NAS switch, in the data path of a client and a NAS file server on the storage network, provides a centralized point of reconfiguration after a network change that alleviates the need for reconfiguration of each connected client. The client uses a NAS request to access a storage object to the NAS switch using a switch file handle that is independent of object location and that can be used to locate the primary and its replica storage objects if the object is subsequently replicated. A replication module replicates a namespace separately from data contained therein. Afterwards, synchronicity module looks-up the switch file handle in a file handle replication table to determine if the object has been replicated and, if so, sends one of the replica NAS file handles. The synchronicity module also maintains synchronicity between the primary and replica file servers through critical NAS requests that modify objects such as create, delete, and the like.

US Patent:

7831641, Nov 9, 2010

Filed:

Apr 26, 2004

Appl. No.:

10/832785

Inventors:

Thomas K. Wong - Pleasanton CA, US
Panagiotis Tsirigotis - Sunnyvale CA, US
Anand Iyengar - Mountain View CA, US
Rajeev Chawla - Union City CA, US

Assignee:

Neopath Networks, Inc. - Santa Clara CA

International Classification:

G06F 17/30

US Classification:

707822, 707827, 707828, 709203, 709219, 709221

Abstract:

A NAS switch provides large file support to a file server in a decentralized storage network such as a NAS (Network Attached Storage) storage network. For example, files greater than 2-GB can be stored on a 32-bit commodity file server. The NAS switch sits in the data path of a client on the front end and a commodity NAS file server on the back end. A segmentation module in the NAS switch stores large files as separate data chunks in the file server. To do so, the segmentation module stores a directory file handle, which points to a directory containing the data chunks, in place of the large file. The segmentation module can also store a large file/chunk directory association in a migration cache. A reconstruction module processes client requests concerning large files by issuing requests to specific data chunks. For example, in a read operation, the reconstruction module calculates chunk numbers to determine which file to read and offsets to determine which byte to read within a chunk.

US Patent:

8131689, Mar 6, 2012

Filed:

Oct 2, 2006

Appl. No.:

11/537997

Inventors:

Panagiotis Tsirigotis - Sunnyvale CA, US
Geetha Srikantan - Palo Alto CA, US
Thomas K. Wong - Pleasanton CA, US
Chi Ming Wong - San Francisco CA, US
Anand Iyengar - Mountain View CA, US
Rajeev Chawla - Union City CA, US
Richard Simpkins - Mountain View CA, US
Zuwei Liu - Cupertino CA, US
Gaurav Gupta - Mountain View CA, US
Matthew Seitz - San Jose CA, US
Yu Cheong Chan - Mountain View CA, US

International Classification:

G06F 17/00

US Classification:

707694, 707822, 707827, 707828, 709201, 709203, 709219, 709221

Abstract:

A system and method for performing policy-based storage management using data related to access frequency and file attribute accumulation. A switch device provides transparency for transactions between a client and a storage network. The transparency allows objects (e. g. , files or directories) to be moved (e. g. , migrated) on the storage network without affecting a reference to the object used by the client (e. g. , a file handle). A monitoring module generates accumulation data associated with the transactions for use in policy-based management. The accumulation data can describe uses of the file such as how often certain files are accessed, modifications to files such as creations of new directories or files, and other uses.

US Patent:

8180843, May 15, 2012

Filed:

Jan 24, 2008

Appl. No.:

12/019582

Inventors:

Thomas K. Wong - Pleasanton CA, US
Panagiotis Tsirigotis - Sunnyvale CA, US
Anand Iyengar - Mountain View CA, US
Rajeev Chawla - Union City CA, US

Assignee:

Neopath Networks, Inc. - Santa Clara CA

International Classification:

G06F 13/00

US Classification:

709214, 709215, 709225

Abstract:

A NAS switch provides file migrations in a NAS storage network that are transparent to the clients. A source file server exports an original NAS file handles indicative of object locations on the source file server to the NAS switch. The NAS switch modifies the original NAS file handles to an internal file system and maps the original NAS file handles to a switch file handles independent of location. The NAS switch exports the switch file handles to a client. The client looks-up objects and makes NAS requests to the source file server using switch file handles. The NAS switch performs file migration by first replicating the namespace containing data to be migrated from source file server to a destination file server. Separately, the NAS replicates data which is a relatively longer process than the namespace replication. During data replication, namespace access requests for objects are directed to the replicated namespace.

US Patent:

8190741, May 29, 2012

Filed:

Mar 31, 2006

Appl. No.:

11/395118

Inventors:

Thomas K. Wong - Pleasanton CA, US
Anand Iyengar - Mountain View CA, US
Panagiotis Tsirigotis - Sunnyvale CA, US
Chi Ming Wong - San Francisco CA, US
Yu Cheong Chan - Mountain View CA, US
Richard A. Simpkins - Mountain View CA, US

Assignee:

Neopath Networks, Inc. - Mountain View CA

International Classification:

G06F 15/173

US Classification:

709226

Abstract:

Systems and methods to customize a namespace using a synthetic namespace. A NAS switch provides file migrations in a NAS storage network that are transparent to the clients. The NAS switch file handles are used to customize a namespace. More specifically, a synthetic namespace is generated from one or more file location tables that map the switch file handles to NAS file handles. The NAS file handles are independent of a physical export containing the objects referred to by the NAS file handles. In one example, the synthetic namespace presents a home directory corresponding to a location of a user.

US Patent:

8195627, Jun 5, 2012

Filed:

Sep 30, 2005

Appl. No.:

11/241554

Inventors:

Chi Ming Wong - San Francisco CA, US
Thomas K. Wong - Pleasanton CA, US
Panagiotis Tsirigotis - Sunnyvale CA, US
Anand Iyengar - Mountain View CA, US
Rajeev Chawla - Union City CA, US
Yu Cheong Chan - Mountain View CA, US
Zuwei Liu - Cupertino CA, US
Matthew Seitz - San Jose CA, US
Richard A. Simpkins - Mountain View CA, US
Geetha Srikantan - Palo Alto CA, US
Gaurav Gupta - Mountain View CA, US

Assignee:

Neopath Networks, Inc. - Mountain View CA

International Classification:

G06F 17/00

US Classification:

707694, 707822, 707827, 707828, 709203, 709219, 709221

Abstract:

The present invention provides selective migration in a storage network in accordance with a policy. The policy can include rules that establish which objects are migrated from a source file server to a destination file server based on file attributes (e. g. , file type, file size, last access time, frequency of access). For example, large multimedia files that consume I/O bandwidth on expensive or critical file servers, without adding much value to enterprise productivity, can be migrated to a commodity or less critical file server.

US Patent:

20040267832, Dec 30, 2004

Filed:

Apr 26, 2004

Appl. No.:

10/832927

Inventors:

Thomas Wong - Pleasonton CA, US
Panagiotis Tsirigotis - Sunnyvale CA, US
Anand Iyengar - Mountain View CA, US
Rajeev Chawla - Union City CA, US

International Classification:

G06F017/00

US Classification:

707/200000

Abstract:

A NAS switch provides extended storage capacity to a file server in a decentralized storage network such as a NAS (Network Attached Storage) storage network. The NAS switch sits in the data path of a client on the front end and a directory file server and shadow file servers on the back end. A segregation module in the NAS switch replicates data from the directory file server to a shadow file server, and then replaces the data in the directory file server with holey files. Holey files, which store a range of consecutive values such as zero with negligible storage space, retain the attributes of the data without retaining its storage consumption. Thus, the directory file server can server as a single directory hierarchy for several shadow file servers containing data beyond a capacity of the directory file server. When the NAS switch receives operations from the client, an association module forwards directory operations to the directory file server and data operations to the shadow file server. The NAS switch also provides services to several shadow file servers from a single directory file server.