Research On File System And Security Mechanism For Object-Based Storage Device

Object-Based Storage (OBS) system is secure and flexable to implement data-sharing between different platforms, also it is of high performance and scalability. Object-based Storage Device (OSD) is intelligent network storage node in object-based storage system, it can provide users with object-based acccess interface, and implement autonomous storage management for objects in it.Object-based file system is kernel of OSD software system, OSDFS is a simple implemention of it. OSDFS is a logical object file system based on ext2 file system of linux, it is in charge of mapping between objects and ext2 files to implement storage management of objects in OSD.In order to optimize storage of objects in OSD, a smart object-based file system (SOBFS) is proposed for OSD, it can make objects for different applications adopt different storage management strategy according to their attributes. SOBFS is a file systems container, and it can contain several file systems for different applications. At present, it contains two file systems: general object file system and media object file system, one is for small objects such as general documents, webs and so on, and the other is for large media objects. Compared with OSDFS theoretically, SOBFS reveals better performance.Considering security of objects in OSD, a security mechanism for OSD is proposed. The access control mechanism based on credential guarantees user's legal access to objects in OSD and maintains integrity of commands and data between users and OSD. Also, the security of object-based file system assures privacy of data in OSD, and the system is still enough flexible to implement data share between users. In addition, experimental results show that the system does not impose much performance penalty for security overhead...