光纤通道RDMA技术的研究与实现

发布时间：2018-04-24 06:15

本文选题：光纤通道 + 远程直接内存存取　；参考：《华中科技大学》2012年硕士论文

【摘要】：光纤通道具有高速、低延迟、高可靠、传输距离远、可扩展性好等特点，其成为目前存储区域网络（SAN，Storage Area Network）的最主要的互联技术。在存储网络的数据访问过程中，RDMA（Remote Direct MemoryAccess）即远程直接内存访问，可以有效地避免数据在内核内存和用户内存之间的多次拷贝，提高主机端数据处理的效率。研究RDMA技术在光纤通道中的应用，可以将两者的优势相结合，并应用于FC-SAN存储网络中，可以有效地降低网络延迟、主机端数据处理延迟，从而大大提高网络的性能。针对基于RDMA的FC-SAN系统的整体框架，研究系统发起端和目标端包含的各个层次的主要功能、层与层之间的衔接和交互过程、以及SCSI命令和数据从发起端到目标端传输过程中在各个层次中所做的处理。完成了光纤通道SCSI低层设备驱动和RDMA处理层的设计与实现。光纤通道SCSI低层设备驱动实现了与Linux核态的SCSI中间层的交互；RDMA处理层通过虚拟字符设备接口实现了与用户层应用程序的交互；实现了FCP协议，使自主研发的光纤适配器正常地收发光纤通道帧，实现了远程SCSI存储设备挂载到本地；完成了光纤通道点对点拓扑结构的搭建，采用RDMA方式通过内存注册、映射保留内存、接收应用程序请求及处理等过程，，对挂载到本地的远程SCSI存储设备进行读写访问，并与普通方式下的读写访问性能进行对比，测试结果表明，RDMA方式的读写访问性能明显优于普通方式下的读写访问性能。
[Abstract]:Optical fiber channel has the characteristics of high speed, low delay, high reliability, long transmission distance and good expansibility. It has become the most important interconnection technology of storage Area network. In the process of data access in storage network, remote Direct memory access (RDMA), that is, remote direct memory access, can effectively avoid multiple copies of data between kernel memory and user memory, and improve the efficiency of data processing on host side. The application of RDMA technology in optical fiber channel can combine the advantages of the two technologies and be applied to FC-SAN storage network. It can effectively reduce the network delay and data processing delay on the host side, thus greatly improving the performance of the network. In view of the overall framework of FC-SAN system based on RDMA, the main functions of each level, the connection and interaction between layers, are studied at the initiator and the target of the system. And the processing of SCSI commands and data from the initiator to the target at all levels. The design and implementation of fiber channel SCSI device driver and RDMA processing layer are completed. The fiber channel SCSI low-level device driver realizes the interaction with the Linux core SCSI intermediate layer and the user layer application program through the virtual character device interface, and implements the FCP protocol. The self-developed fiber adapter can send and receive the optical fiber channel frame normally, realize the remote SCSI storage device mount to the local place, complete the construction of the optical fiber channel point-to-point topology structure, adopt the RDMA mode to register through the memory, map the memory, keep the memory, In the process of receiving application request and processing, the read / write access of remote SCSI storage device mounted to the local area is carried out, and the performance of read / write access is compared with that in common mode. The test results show that the performance of RDMA is better than that of RDMA.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TN929.11;TP333

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