Robert Michael Curran

US Patent:

59567341, Sep 21, 1999

Filed:

Jul 11, 1997

Appl. No.:

8/890780

Inventors:

Frank B. Schmuck - Campbell CA
Robert J. Curran - West Hurley NY
James Christopher Wyllie - Monte Sereno CA
Sibylle Schaller - Haifa, IL

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

B06F 1730

US Classification:

707205

Abstract:

A computer system having a shared disk file system running on multiple computers each having their own instance of an operating system and being coupled for parallel data sharing access to files residing on network attached shared disks. Methods are provided for use as a parallel file system in a shared disk environment by use of a scaleable directory service for the system with a stable cursor, and a segmented allocation map. Dynamic prefetch and cached balance pools for multiple accesses improve the system. Extended file attributes are used for implementation of Access Control Lists in a parallel file system. A metadata node manages file metadata for parallel read and write actions. For our system, tokens are used for metadata node selection and identification. We have provided recoverable local shares for quota Management.

US Patent:

59466863, Aug 31, 1999

Filed:

Jul 11, 1997

Appl. No.:

8/891641

Inventors:

Frank B. Schmuck - Campbell CA
James Christopher Wyllie - Monte Sereno CA
Robert J. Curran - West Hurley NY
Zvi Yosef Yehudai - Haifa, IL
Roger Lee Haskin - Morgan Hill CA
Sibylle Schaller - Dossenheim, DE

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1516

US Classification:

707 10

Abstract:

A computer system having a shared disk file system running on on multiple computers each having their own instance of an operating system and being coupled for parallel data sharing access to files residing on network attached shared disks. Methods are provided for use as a parallel file system in a shared disk environment by use of a scalable directory service for the system with a stable cursor, a segmented allocation map. Synchronous and asynchronous takeover of a metadata node occurs for correction of metadata which was under modification and a new computer node to be a metadata node for that file. Locks are not constantly required to allocate new blocks on behalf of a user. We have provided recoverable local shares for Quota Management. A quota server and a quota client are provided for each file system, and a quotacheck utility allows parallel environments with minimal interference to other applications which require the use of quotas.

US Patent:

59501995, Sep 7, 1999

Filed:

Jul 11, 1997

Appl. No.:

8/893725

Inventors:

Frank B. Schmuck - Campbell CA
Robert J. Curran - West Hurley NY
Boaz Shmueli - Haifa, IL

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 13362
G06F 17173

US Classification:

707 8

Abstract:

A computer system having a shared disk file system running on multiple computers each having their own instance of an operating system and being coupled for parallel data sharing access to files residing on network attached shared disks. Methods are provided for use as a parallel file system in a shared disk environment by use of a scalable directory service for the system with a stable cursor, a segmented allocation map. Dynamic prefetch and cached balance pools for multiple accesses improve the system. Extended file attributes are used for implementation of Access Control Lists in a parallel file system. Improvements to caching and cache performance developments balance pools for multiple accesses. A metadata node manages file metadata for parallel read and write actions. For our system, tokens are used for metadata node selection and identification, and we have enhanced token modes for controlling file size, as well as smart caching of byte range tokens using file access patterns and a byte range lock algorithm using a byte range token interface.

US Patent:

60215089, Feb 1, 2000

Filed:

Jul 11, 1997

Appl. No.:

8/893627

Inventors:

Frank B. Schmuck - Campbell CA
Radha R. Kandadai - Lake Katrine NY
Anthony J. Zlotek - Pleasant Valley NY
Robert J. Curran - West Hurley NY
William A. Kish - Millerton NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1100

US Classification:

714 4

Abstract:

A computer system having a shared disk file system running on multiple computers each having their own instance of an operating system and being coupled for parallel data sharing access to files residing on network attached shared disks. Locking techniques reduce the overhead of a token manager which is also used in the file system recovery if a computer participating in the management of shared disks becomes unavailable or failed. Synchronous and asynchronous takeover of a metadata node occurs for correction of metadata which was under modification and a new computer node to be a metadata node for that file. Locks are not constantly required to allocate new blocks on behalf of a user.

US Patent:

59744243, Oct 26, 1999

Filed:

Jul 11, 1997

Appl. No.:

8/893723

Inventors:

Frank B. Schmuck - Campbell CA
Robert Curran - West Hurley NY
James Christopher Wyllie - Monte Sereno CA
Boaz Shmueli - Haifa, IL

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1730

US Classification:

707201

Abstract:

A computer system having a shared disk file system running on multiple computers each having their own instance of an operating system and being coupled for parallel data disks. One of the computers serves as a metadata node and manages metadata for parallel read and write actions for a particular file. Metadata is transferred from and to this file from the other computers via this medadata node computer.