Parallel file system and method for parallel write sharing

Details Parallel file system and method for parallel write sharing Parallel file system and method for parallel write sharing

1997-07-11

1999-11-16

Lim, Krisna

Data processing: database and file management or data structures

Database design

Data structure types

707200, 707205, 707 8, 707 10, 709203, 709213, 711170, G06F 1516, G06F 1730

Patent

active

059874775

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. 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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