Robert K Gjertsen7404 Filbert Cv, Austin, TX 78750

8306950, Nov 6, 2012

Aug 26, 2010

12/868877

Janet E. Adkins - Austin TX, US
Joon Chang - Austin TX, US
Robert K. Gjertsen - Austin TX, US
Ninad S. Palsule - Beaverton OR, US

International Business Machines Corporation - Armonk NY

G06F 7/00
G06F 17/00

707639, 707695, 707822, 709216, 711161, 711162, 711E21103

A client node on which a file system is mounted can be configured to efficiently handle content access requests after a snapshot is created. The client node can maintain generation numbers at a data block, a file, and a fileset level to determine whether a data block is part of a snapshot generation and consequently whether the data block is writable in a current generation. Data block mappings and write access permissions associated with the data blocks need not be revoked at the client node prior to creating the snapshot. Cached data block mappings can be accessed to identify data blocks for servicing a read request. The data block can be updated in place if the data block is not part of the snapshot generation. The write request can be serviced at a new data block if the data block is part of the snapshot generation.

2012006, Mar 15, 2012

Sep 10, 2010

12/879228

Joon Chang - Austin TX, US
Robert K. Gjertsen - Austin TX, US
Ninad S. Palsule - Beaverton OR, US

International Business Machines Corporation - Armonk NY

G06F 17/30

707704, 707827, 707E1701, 707E17008

Embodiments include a method comprising transmitting from a node of a plurality of nodes within a clustered file system provides concurrent file I/O access for files, to write access a region of a file. The method includes receiving an authorization to write access the region without a lock to preclude access of the region by other nodes, if at least one physical section in a machine-readable medium has been allocated for storage of the region by the server. The method includes receiving the authorization to write access the region with the lock to preclude access of the region by the other nodes, if the at least one physical section in the machine-readable medium has not been allocated for storage of the region by the server. Responsive to receiving the authorization to write access, metadata is transmitted for storage into the at least one physical section in the machine-readable medium.

2012025, Oct 11, 2012

Apr 5, 2011

13/080151

Robert K. Gjertsen - Austin TX, US
Manoj N. Kumar - Austin TX, US
David J. Craft - Austin TX, US
Gokul B. Kandiraju - Tarrytown NY, US

International Business Machines Corporation - Armonk NY

G06F 17/30

707674, 707E17007

Hierarchical recovery of failed computing nodes to operative computing nodes within a cluster of computing nodes is managed by initiating a recovery leader at an operative node that retrieves management information from the operative nodes and applies the management information to recover filesets of a meta-fileset in a hierarchical filesystem. The use of hierarchical filesets throughout the cluster provides more rapid failover by distributing recovery load across computing nodes and supporting recovery of nodes in parallel.

2013003, Jan 31, 2013

Oct 1, 2012

13/632340

INTERNATIONAL BUSINESS MACHINES CORO - Armonk NY, US
Joon Chang - Austin TX, US
Robert K. Gjertsen - Austin TX, US
Ninad S. Palsule - Bangalore, IN

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

G06F 12/16
G06F 17/30

707649, 707E17005

A client node on which a file system is mounted can be configured to efficiently handle content access requests after a snapshot is created. The client node can maintain generation numbers at a data block, a file, and a fileset level to determine whether a data block is part of a snapshot generation and consequently whether the data block is writable in a current generation. Data block mappings and write access permissions associated with the data blocks need not be revoked at the client node prior to creating the snapshot. Cached data block mappings can be accessed to identify data blocks for servicing a read request. The data block can be updated in place if the data block is not part of the snapshot generation. The write request can be serviced at a new data block if the data block is part of the snapshot generation.

2013003, Feb 14, 2013

Aug 12, 2011

13/209104

William B. Brown - Austin TX, US
Robert K. Gjertsen - Austin TX, US
David J. Craft - Wimberly TX, US

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

H04L 12/26

370216

According to one aspect of the present disclosure, a method and technique for hierarchical network failure handling in a clustered node environment is disclosed. The method includes: detecting a network failure by a node in a cluster, the cluster having plural nodes arranged in a hierarchy, wherein the network failure is associated with a subordinate node in the hierarchy to the detecting node; communicating the network failure from the detecting node to a superior node in the hierarchy; determining whether the network failure affects nodes higher than the detecting node in the hierarchy; and responsive to determining that the network failure does not affect nodes higher than the detecting node in the hierarchy, the detecting node initiating a protocol to expel the subordinate node from the cluster.

5141711, Aug 25, 1992

Jul 18, 1991

7/732373

Robert K. Gjertsen - Columbia SC
Ronald P. Knott - Columbia SC
James A. Sparrow - Columbia SC

Westinghouse Electric Corp. - Pittsburgh PA

G21C 710

376327

A reconstitutable control assembly has a spider structure which supports control rods by detachable attachment joints. Each attachment joint includes a hollow connecting finger on the spider structure and an elongated detachable split upper end plug on each control rod. The split upper end plug includes a pair of separate upper and lower plug portions. The upper plug portion has upper, middle and lower sections, whereas the lower plug portion has upper, middle and lower segments. The upper section of the upper plug portion is rigidly attached to the connecting finger on the spider structure, whereas the lower segment of the lower plug portion is rigidly connected to the control rod. Also, the lower section of the upper plug portion and the middle segment of the lower plug portion have complementary threads defined thereon for rigidly threadably attaching the upper and lower plug portions to one another. Two embodiments of locking features can be used in conjunction with the upper and lower plug portions for locking them together so as to resist their unthreading from one another.

4738820, Apr 19, 1988

Nov 21, 1986

6/933716

John F. Wilson - Murrysville PA
Robert K. Gjertsen - Columbia SC

Westinghouse Electric Corp. - Pittsburgh PA

G21C 332

376446

A nuclear reactor fuel assembly bottom nozzle to guide thimble attachment system and method allowing bottom nozzle removal and replacement without inverting the fuel assembly. At manufacture, a bottom-insertable, two-headed bolt secures the bottom nozzle adaptor plate to the guide thimble bottom end plug. The two-headed bolt is unthreadable in the guide thimble from the top of the upright fuel assembly. At reconstitution, a top-insertable bolt fastener secures the replacement or original bottom nozzle adaptor plate to the guide thimble bottom end plug. The bolt fastener is inserted in the guide thimble from the top of the upright fuel assembly. The bolt fastener is unthreadable in the guide thimble from the top of the upright fuel assembly for a second reconstitution. Less preferably, the bolt fastener also can be used for original manufacture (in place of the two-headed bolts previously discussed).

4888151, Dec 19, 1989

Dec 15, 1988

7/284566

Robert K. Gjertsen - Columbia SC
Ronald P. Knott - Irmo SC
James A. Sparrow - Columbia SC

Westinghouse Electric Corp. - Pittsburgh PA

G21C 710

376327

A reconstitutable control assembly has a spider structure which supports control rods by detachable attachment joints. Each attachment joint includes a hollow connecting finger on the spider structure and an elongated detachable split upper end plug on each control rod. The split upper end plug includes a pair of separate upper and lower plug portions. The upper plug portion has upper, middle and lower sections, whereas the lower plug portion has upper, middle and lower segments. The upper section of the upper plug portion is rigidly attached to the connecting finger on the spider structure, whereas the lower segment of the lower plug portion is rigidly connected to the control rod. Also, the lower section of the upper plug portion and the middle segment of the lower plug portion have complementary threads defined thereon for rigidly threadably attaching the upper and lower plug portions to one another. Two embodiments of locking features can be used in conjunction with the upper and lower plug portions for locking them together so as to resist their unthreading from one another.