Data processing: database and file management or data structures – File or database maintenance – Synchronization
Reexamination Certificate
2007-12-14
2010-06-15
Lee, Wilson (Department: 2163)
Data processing: database and file management or data structures
File or database maintenance
Synchronization
C707S781000
Reexamination Certificate
active
07739236
ABSTRACT:
The present invention provides for a method and a computer system for preserving filehandles after a file system migration on a distributed file system. One embodiment of the invention includes maintaining a cache of each filehandle provided to a client from a source file server. When files are migrated from the source file server to the destination file server, the cache entries are transferred from the source file server to the destination file server. The cache entries are then updated to link the source file server filehandle of each cached data object to the file attributes of the data object now existing on the destination file server. When a client subsequently attempts to access a file by using a previously valid filehandle, the cache will translate the source file server filehandle into the file attributes of the object on the destination file server, allowing the file to be located without receiving a filehandle expiration error.
REFERENCES:
patent: 5806065 (1998-09-01), Lomet
patent: 6772161 (2004-08-01), Mahalingam et al.
patent: 6775672 (2004-08-01), Mahalingam et al.
patent: 6775673 (2004-08-01), Mahalingam et al.
patent: 6938039 (2005-08-01), Bober et al.
patent: 7444337 (2008-10-01), Zhou et al.
patent: 2003/0177114 (2003-09-01), Lin et al.
patent: 2004/0117410 (2004-06-01), Dietterich et al.
patent: 2005/0210072 (2005-09-01), Bojinov et al.
“Concept and Evaluation of X-NAS: a Highly Scalable NAS System,” Yoshiko Yasuda, 20thIEEE/11thNASA Goodard Conference on Mass Storage Systems and Technologies, 2003, 10 pages (including cover).
“The Conquest File System: Better Performance Through a Disk/Persistent-RAM Hybrid Design,” Wang et al., 2006, pp. 309-348.
“Live Wide-Area Migration of Virtual Machines Including Local Persistent State,” Bradford et al., 2007, pp. 169-179.
“Migrating Sockets—End Systems Support for Networking with Quality of Service Guarantee,” 1998, pp. 700-716.
“The Implementation of Dynamite—an environment for migrating PVM tasks,” Iskra et al., 1994, pp. 40-55.
International Business Machines - Corporation
Lee Wilson
Oppenheimer Wolff & Donnelly LLP
LandOfFree
System and method for preserving filehandles across file... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for preserving filehandles across file..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for preserving filehandles across file... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4197793