Data processing: database and file management or data structures – Database design – Data structure types
Patent
1997-07-11
1999-09-07
Kulik, Paul V.
Data processing: database and file management or data structures
Database design
Data structure types
707 3, 707 10, 39520031, 3952004, 39520053, G06F 13362, G06F 17173
Patent
active
059501995
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. 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.
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Curran Robert J.
Schmuck Frank B.
Shmueli Boaz
Augspurger Lynn L.
Homere Jean R.
International Business Machines - Corporation
Kulik Paul V.
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