METHOD FOR PROVIDING SNAPSHOT OF FILESET OF OBJECT BASED FILE SYSTEM

摘要

A method for providing a snapshot of a file set in an object based file system is provided to generate, eliminate or access the snapshot of the file set consistently while separating the snapshot information into a metadata server and an object storage server for providing the file set level snapshot in an object based file system which stores and manages the file as a logical object. A method for providing a snapshot of a file set comprises the following several steps. An object based file system locks all the files forming the file set before generating the snapshot(201). The object based file system guarantees consistency of the snapshot by locking the snapshot until finishing generating the snapshot(202). The system generates a snapshot file set(203). The system transmits a snapshot partition generation request to an object storage server(204). The system copies directory entries on all the files forming the file set to the snapshot file set(205). The system makes i-nodes of all the files of the file set point to a super block of the currently generated snapshot(206). The system maintains a snapshot file set list according to a snapshot performing order(207). If finishing generating the snapshot, the system gives back lock of the snapshot(208) and gives back lock of files(209).