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Design and implementation of Fibre Channel SCSI target device based

Author: ZhaoFeng
Tutor: TuXiaoDong
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: FC-SAN SCSI Target RAM
CLC: TP333
Type: Master's thesis
Year: 2011
Downloads: 63
Quote: 1
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Abstract


Fibre Channel protocol is a layered and serial transmission standard, integrated storage standards of channel and network, achieved high-speed data transmission between servers and storage devices. Fiber channel can transmit both IP data packets and SCSI CDB(command descriptor blocks).The advantages of fiber channel are the higher transmission rate, more connections of equipment, longer transmission distance, smaller communication overhead, higher transmission reliability,etc. These advantages let Fiber channel be appropriate for data exchange for the FC storage system. Fiber channel is used extensively in SAN. FC-SAN adopted the distributed file systems based on the host, The user can directly operate the data blocks on the storage devices. In the FC-4 layer protocol, we use the FCP-SCSI which is the ULP layer mapping by SCSI protocol. SCSI system uses C/S(Client - Server) model.Promote by the technical progress such as modern information technology, the modern enterprise data or personal information is continuing to grow, the storage system faces enormous challenges. With the increasing amount of data network storage, server performance becomes more powerful, and equipped with more RAM and Cache to handle the large number of access requests from the network. In addition, the current growth of disk capacity and performance gap between the growing capacity and performance than the growth rate of close to 6:1, and the disk performance is far below the growth rate of RAM and CPU performance growth.Because the performance bottlenecks of FC-SAN network storage system mainly in the storage subsystem storage device, so we need to study the new I/O access mechanism to improve equipment performance.This paper introduces the hierarchical structure of FC protocol, topology, port type and address, analyzes the relationship mapping between FCP protocol and SCSI protocol, and also detailed introduced the FCP-SCSI protocol information unit. Then selected the appropriate standards (ie SBC protocol, SPC protocol, SAM protocol, FCP protocol standards) for different protocol layers to design a SCSI target device. SCSI target device is based on Fibre Channel architecture ,and it implemented all program modules. SCSI target device is capable of dividing the size of data and according to the size operating differently SCSI I/O device. Large amount of data read and write access to physical disk and small data read and write are operated on the RAM_LU. RAM_LU is implemented based on the RAM of PC server. SCSI Target can simulated the device server to receive and process the SCSI command from the client, and simulated the basic functions of the Task Manager, read and completed write data operations and some administrative functions. Finally, according to the design of FC-SAN systems we built the environment to detailed test the performance of SCSI Target. Experimental results showed that the rate based on this mode I/O storage system can be close to the maximum line speed.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Electronic digital computer (not a continuous role in computer ) > Memory
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