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Network block device driver mirror Research and Implementation

Author: ChenHong
Tutor: LuXianLiang
School: University of Electronic Science and Technology
Course: Computer System Architecture
Keywords: Network-attached storage Linux kernel Linux kernel module program Network mirror
CLC: TP316
Type: Master's thesis
Year: 2004
Downloads: 155
Quote: 1
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Abstract


This article briefly describes the overall structure of the Linux file system and major data structures, and then focuses on the management of Linux on the buffer block, and finally gives the system call to install or uninstall the file system implementation processes and related data structures. Then on the basis of careful analysis of the above network storage mirroring method, cited several examples to analyze how effectively intercept the user to read and write data. Because the mirror is used in the network TCPIP protocol stack and network programming, so this part of the article also were analyzed. Final analysis of the kernel of some key mechanisms to improve performance. Then came the most important place in this paper is that under Linux driver for the preparation part, because our focus is a block device driver, so a simple introduction about how to write drivers, and then focus on analysis of the block Device Driver important data structure, an important function, and there are request queue data structure and operations functions and so on. Finally, in order to ensure portability, I used not to change the Linux source code tree method, but a method to load the kernel module, it is also a detailed analysis of how to write kernel modules. Then a detailed analysis of the Linux system implemented in software and NAS disk mirroring method, which involves software Raid and Nbd some kernel code, derived from the network mirroring system can take reference from these two different block device driver part of the code, that is, from the Raid learning block device mirroring, and then learn from Nbd data block in the network to deliver some of the techniques. In fact, if we carefully study the Linux kernel source code, you can achieve a lot of things, this is it more popular than Windows systems Hacker welcomed causes. Finally went to the NMBD driver design and implementation methods, the code can be seen from the Linux source tree to me much help. But also in the implementation process found some problems, such as different applications on the consistency of the data block has different needs, such as between the sending and receiving ends to read and write data blocks some of the effects. Then NMBD are carefully considered and made in a number of algorithms to solve. Through preliminary testing of the system, that the system initially achieved design goals.

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