User-level backup file system

Details User-level backup file system User-level backup file system

G - Physics

06

F

G06F 9/44 (2006.01) G06F 9/46 (2006.01) G06F 11/14 (2006.01) G06F 11/20 (2006.01) G06F 17/30 (2006.01)

Patent

CA 2124123

A backup file system which can be used without modification of application programs, the operating system, or the hardware. The backup file system is implemented by means of a dynamically-linkable replacement library and user-level processes on a primary computer system and a backup computer system. The dynamically-linkable replacement library has the same interfaces as a standard dynamically-linkable library of file operations. The functions in the replacement library perform the same file operations as their counterparts in the standard library; in addition they send messages specifying the just-performed operation to a user-level process on the backup computer system. The user-level process executes the operation specified in the message on a backup file in the backup computer system. The files to be backed up are specified by identifying subtrees in the namespace of the primary file system; the subtrees make up a user-defined namespace. The backup file system is made fault tolerant by the use of monitor processes which monitor the backup computer system and the processes of the backup file system and deal withfailures as required to keep the backup file system operating.

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