随着网络上的数据呈爆炸性的增长 ,融合 NAS和 SAN技术的 USN (统一存储网 )正成为新的研究热点 .针对传统文件服务器的缺点 ,我们实现了一个新的基于 U SN的文件服务器 U sn FS(USN- based File Server) ,在文中 ,我们详细介绍了这种文件服务器的设计方案 。
With the increasing explosively of data in network,more and more people pay attention to the networked storage ,currently the main technology of networked storage is NAS ( Network Attached Storage )and SAN ( Storage Area Network ). They are different ,and they are not competed but complement ,they are used in different occasion.To reduce the TOC (total of cost),people hope to merges the two technology :design a united storage network,it can supply the virtues and overcome the drawbacks of the NAS and SAN. This paper analysis and discuss the topic.
Both the requirement of the application and the development of the technology invoke the research of the new networking technology in network storage, currently the IP -based SAN has become the new focus. The main networking technology used in the IP -based SAN is: iSCSI, FCIP, iFCP, mFCP. These protocols all implement the transmitting of SCSI block I/O over the TCP/IP. To understand the protocols deeply, this paper analyzes and compares the protocols intensively.
To improve I/O speed and system performance of network storage devices, a special storage server that is an iSCSI-based network-attached storage server (iSCSI-based network-attached storage server, for short iNAS) is designed. The iNAS can provide both the file I/O and the block I/O services by an iSCSI module, and it converges with the NAS and the SAN (storage area network). The iNAS improves the I/O speed by the direct data access (zero copy) between the RAID (redundant array of inexpensive disks) controller and the user-level memory. The iNAS integrates the multi-RAID for a single storage pool by a multi-stage stripping device driver, and it implements the storage virtualization. In the experiments, the iNAS has ultra-high-throughput for both the file I/O requests and the block I/O requests.
