Data processing: database and file management or data structures – File or database maintenance – Synchronization
Reexamination Certificate
2008-04-29
2011-11-08
Dang, Thanh-Ha (Department: 2163)
Data processing: database and file management or data structures
File or database maintenance
Synchronization
C707S615000, C707S616000, C707S624000, C707S637000, C707S639000, C707S640000, C707S646000, C707S647000, C707S648000, C707S649000, C707S651000, C707S682000, C707S685000
Reexamination Certificate
active
08055613
ABSTRACT:
A method and apparatus for efficiently logging changes to a file system are disclosed. A file system filter driver intercepts I/O requests directed to a file system, and analyzes the I/O requests to determine whether the requests are write or modify requests directed to a file included in a list of files to be monitored for changes. If the I/O request is directed to such a file, the file system filter driver logs the I/O request to a b-tree structured change log file. Furthermore, in one embodiment, the file system filter driver is configured to log file system changes to multiple log files to coincide with snapshot operations, such that the file system changes to be included in each snapshot are included in separate log files.
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Aravindan Sajeev
Mu Paul Yuedong
Srinivasan Chandrasekar
Dang Thanh-Ha
Netapp, Inc.
Perkins Coie LLP
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