【作者】 张羚；

【导师】 冯丹；

【作者基本信息】 华中科技大学 ， 计算机系统结构， 2006， 硕士

【摘要】 作为下一代互联网信息存储的核心技术,基于对象的存储系统结合了SAN(Storage Area Network)基于块存储和NAS(Network Attached Storage)基于文件存储的优势,提供了功能更加丰富的对象接口,在数据共享、安全性及智能化方面得到突破,具有多层次、可扩展、高性能、高安全性的特点。基于对象的存储设备作为系统中的存储实体,一方面需要承担对象的存储管理、设备安全管理、设备与外界的网络通讯等功能;另外一方面需要实现设备的智能化,能够分析负载特征和对象属性,进行数据对象的预取和缓存。基于对象的存储设备在数据传输方面,采用Intel的微处理器80314,它内部采用64位的交换结构网络;在数据处理方面,采用Intel的微处理器80200双CPU。对外接口采用2个31244 SATA(Serial ATA)控制器和1个千兆物理层网络控制器。基于对象的存储设备整个控制软件构建在实时操作系统TimeSys Linux之上,完成iSCSI(Internet SCSI)的命令解析以及OSD(Objected-based Storage Device)命令解析。由基于对象文件系统负责对象数据及其属性在磁盘上的存放、空闲磁盘的空间管理,其中索引区的搜索,采用B+树技术,可以提高磁盘位置的索引速度;数据区的管理,采用Buddy算法技术,可以提高磁盘空间的利用率;数据的动态预取算法,可以提高数据的读取速度。由Intel GD 31244驱动程序完成对该芯片的控制,实现了DPA(Direct Port Access)的数据传输模式,使多个磁盘设备可以同时访问,从而提供了更好的传输性能。最后分别在开发板Intel 80314实现驱动程序的数据测试和在软件平台上实现OBFS(Object-based File System)文件系统的数据测试。驱动程序满足磁盘的读写,文件系统在32KB缓存的性能优化下和网络文件系统性能相当。更多还原

【Abstract】 As the key technology of next generation Internet storage, Object-based storage system integrates SAN which is ba sed on block storage and NAS which is based on file storage. It provides an expressive object-level interface to user and improves the performance of the whole storage system in terms of data sharing, security and intelligence. The characteristic of the Object-based storage system is hierarchical structure, strong scalability, high performance and strong reliability.Object-based storage device is physical element of the system. It abstracts away file storage details such as allocation and scheduling, semi-independently managing. It is with responsibility for space management, security management and data transmission management. And it needs to analyze system load characteristic, optimize the disk layout and prefetch data object.Object-based storage device transfers object with Intel 80314 which is based switch network structure and process object with Intel 80200. It connects disks with two 31244 SATA controllers and Internet with one 1000M network controller. Its whole software structure is built on TimeSys Linux, a kind of real time operation system and designed to interpret iSCSI command and OSD command.The key technologies of software development are Object-based file system and Intel 31244 controller driver. Object-based file system is designed for data and attributer management, free disk space management .B+ tree technology is used to enhance researching speed,buddy arithmetic technology is developed to increase using rate of disk space and data dynamic prefetch technology is used to improve IO rate.Intel 31244 driver is developed for Intel 31244 SATA controller.DPA data trandfer mode is implemented to make disks accessed independenly,and this mode offers better preformace.Finally Intel 31244 driver is tested on Intel 80314 development board , and OBFS file system is tested on the software platform. Driver can satisfy the needs of disks’ read and write. File system have the equivalent performance to NFS when buffer is set to 32KB.更多还原